Patent Description:
People have characteristics of hair and head of hair which differ from one person to the next. Thus, they need products to be adapted to the particular features of their hair.

In particular, they wish to have the best product(s) for the washing treatment. They generally carry out this treatment on a daily basis and feel discomfort when the product is not suited to their situation. Some require a strong washing strength due to greasy hair, for example, others require a strong disentangling care strength, especially due to wet hair, others require a strong shine strength, due to dry hair, especially.

Getting one's bearings amongst all the offerings is not easy, since adding together these different performance properties leads to quite a number of possibilities. Moreover, people would like to have a shampoo which suits them in terms of the sensory nature and in terms of use: fragrance, texture, speed of rinsing, etc..

The same problem exists for other treatments, especially post-washing treatments: care for the hair, provided by masks and conditioners, may be spread across various possibilities.

Numerous people, faced with this situation, count on the opinion of their hairdresser, a specialist in hair who is often well-acquainted with the range of products. He or she may then, knowing their clients well, propose this or that product for their clients. For this reason, ranges of products referred to as "professional" have been created which are sold within the shop and which the hairdresser can recommend on a case-by-case basis.

Nonetheless, this approach has some limitations.

Firstly, the hairdresser is generally found at the cutting station, and not at the washing sink. This means he or she does not touch the hair during the act of washing and care. Thus, he or she only has partial insight into the state of the hair. The person who carries out the shampooing, hereinafter referred to as "shampooer", who is at the washing sink, may make suggestions but as he or she is generally less experienced, his or her diagnosis and product knowledge makes the result less relevant. The consequence of this is that the client may be proposed, and buy, a product which is not completely suited to their situation, which is likely to make them regret their purchase once they test it at home. The risk is all the greater if he or she has been proposed a product with strong performance properties, for example a highly disentangling or highly detergent product.

Given the price of these "professional" products, one possibility is to propose products with less strong performance properties, to avoid problems in case of incorrect advice. However, in so doing, clients may be disappointed, finding performance properties in the product that they buy which they could find in more conventional and hence less expensive shampoos.

Further, the salon does not necessarily have all the products in stock. Thus, the hairdresser and the shampooer may be in a situation in which they are not able to propose an accessible product and so they direct the client towards other products. They may not however have knowledge of the entire extent of the products available and may struggle to make recommendations. The client may then leave the salon with the impression that he or she must find the most suitable products themselves, by going to another salon for example. Faced with this concern, the hairdresser may be tempted to propose a product from among those he or she has in stock, then running the risk of not proposing the optimum product.

It is also known that some clients, due to their head of hair, require particular application procedures involving a particular shampoo and at least one second particular treatment such as conditioner or pre-shampoo. The difficulty is then to find the best succession of products. In this case also, the client is counting on the know-how of the salon to direct them in the procedure. However, as explained above, constraints in terms of experience and availability of products in the salon may reduce the quality of the advice and re-sale of the correct product.

Thus, there is a difficulty for the employees of a hairdressing salon to advise clients on the product(s) best suited to them and on the best way in which to use them.

The risks run in the event of poor advice are significant, ranging from disappointing clients to incurring economic loss, which may lead salons not to propose strong products and members of the cosmetics industry to hesitate to produce highly specialized products. For this reason, this reduces the development of the marketing concept of "salon retail", that is to say retail selling by the hairdresser of products to their clients.

A device making it possible to introduce a cosmetic product such as a soap into the supply of a shower head is known from <CIT>. An adjustment means makes it possible to vary the amount of product aspirated by Venturi effect to be mixed with the water.

<CIT> discloses a device comprising a pressure booster to raise the pressure of the water before conveying it to a dispensing device. In one embodiment example, a source of soap (or of another product) is provided to deliver soap which is mixed with the water downstream of the pressure booster and upstream of the dispensing device. No adjustments of the amount of soap being mixed with the water is provided, other than all or nothing. In one variant, a source of soap is carried by the dispensing device.

Patent <CIT> describes an automated bathroom making it possible to record different temperatures, water levels, and flow rates for various members of the family. A soap may be introduced into the water dispensed upstream of the faucets delivering water to the users.

<CIT> presents a method and an apparatus for customizing a facial foundation product at point of sale to a customer.

<CIT> discloses an apparatus for formulating a custom mixed cosmetic product at the point of sale in response to specific input criteria.

<CIT> relates to a system including a hair color packet assembly having several individual hair color packets and one developer packet, each packet having a pump for delivering selected amounts of material to a mixing assembly.

<CIT> presents a system which determines from memorized data and user provided data types of color results which can be achieved.

There is consequently a need to remedy this situation, and the invention aims to respond thereto by virtue of a system as claimed in claim <NUM>.

By virtue of the invention, the user may more readily determine the treatment suited to the head of hair of the person whose hair is being treated, especially cleansed.

"Usage characteristic" should be understood to mean at least one condition of use of the product enabling it to exert its action: This may for example be the concentration of the product within a treatment solution distributed on the hair by the system, the amount of product used, the content thereof relative to another product used jointly, and/or a sequence of use of this product, especially if it is used before or after another product or with or without rinsing.

"Treatment result" should be understood to mean a result associated at least in part with the use of the product. This may be the degree of cleansing, the foaming strength, the speed of foaming, or a disentangling, smoothing, conditioning or care strength, etc..

The invention gives the shampooer the possibility to seek the best products for their client.

The invention enables the user to carry out adjustment tests, and once satisfied with the results, to record the products used and the conditions of use of these products, especially the amounts, concentrations and/or usage context, for example with or without rinsing or use of pre-shampoo or conditioner.

The information recorded is then of use to determine catalog products making it possible to reproduce the results or come close thereto, and/or to reproduce the treatment upon returning to the salon.

They may also make it possible to hone the treatment to come close to an optimal result, by noting, bit by bit, the change in the results as a function of the treatments. Thus, the system may be arranged to propose a new setting as a function on the one hand of recorded data relating to results previously observed and the corresponding treatment conditions, and on the other hand a request expressed by the client and/or the user and input into the system.

The system may be arranged to enable the user to input information thereon relating to the head of hair to be treated, for example length, consistency, colour, dyeing, relaxing or permanent-wave history, styling habits, regular use of heating systems, state of the hair, etc., and to take these indications into account in the proposals made of settings. The system may further use the information input to modify settings stored in memory for a given client, in order to take account of changes in their head of hair since the previous visit to the salon; for example, the system is arranged to modify the amounts of water and/or product(s) conveyed to the hair as a function of the change in the length thereof since the previous visit to the salon. For example, if the hair is shorter due to a haircut carried out after the last washing operation, the system may reduce the amounts of water and of products used. The system may be arranged to enable the shampooer to input an item of information regarding the length of the head of hair, for example the length in cm thereof. As a variant, the system is arranged to measure it automatically, by virtue, for example, of one or more sensors fitted in the sink.

The system may comprise a means to store at least one setting in memory. This may be an electronic or computer memory, for example a memory of SSD drive type, or hard drive or shared drive, commonly referred to as "cloud". The information may be stored in memory in the system itself, in a circuit board located close to the washing sink, or on a remote server, present in the salon or outside same. When the system is used to automatically or semi-automatically generate a setting based on data stored in memory, it is advantageous to give the system access to the salon's booking system so as to know the identity of the person treated from this booking system, which avoids having to input it into the system; in semiautomatic operation, the system may be arranged to display, on the user interface, the identity of the person as determined by accessing the booking system, in order to enable the shampooer to confirm this information before starting the treatment; it may also be preferable for the system to recall the treatment that it is preparing to carry out automatically, in order to enable the shampooer to input a confirmation.

The user interface may be arranged to make it possible to input at least two items of information, relating respectively to at least two different criteria for evaluating the result of the treatment, into the system. This may be a result during the treatment itself, for example the foaming strength and the speed of foaming, or a result obtained after rinsing but while the hair is still wet, for example the softness of the hair and the ability to disentangle it, or a result estimated when the hair is dry. The result may be estimated by the user visually and/or by touching with the fingers; the user may optionally have available one or more accessories or apparatus making instrument-based evaluation possible; in this case the apparatus used may be linked to the system to enable it to analyze the corresponding data. In this case, it is considered that the use of the apparatus by the shampooer equates to input by said shampooer of an item of information relating to a treatment result, even if this information input is carried out automatically.

The system comprises a means for generating a product recommendation and/or a treatment recommendation at least based on the knowledge of the setting selected and of said at least one item of information input by the user relating to the treatment result. This means comprises, for example, a computer program which accesses product data containing information regarding results that different products make it possible to obtain on the hair, and also regarding the link between these products and the formulation tested on the person who is being treated.

The system is preferably arranged to enable the user to input a preference of the person treated regarding a result to be obtained. The system may then favor, in its recommendation, a product which makes it possible to obtain the desired result, compared to other criteria to be met.

The system is advantageously arranged to generate an indication regarding the conditions of use of a product, as a function of data previously input into the system, enabling it to anticipate the effect of a condition of use of a product on the result obtained; this is for example the system's knowledge of a variation in the treatment strength, for example disentangling strength, of a product as a function of the amount of water used for rinsing.

Preferably, the system according to the invention uses a dispensing device which is supplied by a high-pressure water source by virtue of a pressure booster present upstream; the pressure booster device may comprise at least two nozzles which generate jets, preferably convergent jets, which collide in order to reduce the speed thereof and to transfer this kinetic energy into a reduction in the size of the droplets; this makes it possible to have a resultant jet which wets while having low water consumption; it is particularly advantageous to have low water consumption since this facilitates the dosing of the products used to treat the head of hair.

It is also particularly advantageous to have low water consumption for salons which are not connected to mains water supplies, or which are connected to sporadic mains water supplies.

It is also particularly advantageous to have low water consumption to reduce the effect of the water on the hair when the latter has been treated beforehand by treatments which have deposited an active compound such as a dye compound, disentangling compound, or shine-improving compound. These compounds are often sensitive to water and the use of a weak stream of water may limit the removal of these compounds.

The system is advantageously arranged in order to control not only the amount of each product which is sent to the head of hair, but also the amount of water which is dispensed; knowledge of the amount of water dispensed may be useful especially when the water and the product(s) are dispensed on the head of hair while the outlet of the sink is closed, since this makes it possible to more readily determine the concentration of each product in the solution present in the sink.

The user interface is preferably produced so as to enable the user to modify numerous treatment parameters, in order to carry out a multitude of tests, and thereby to determine the best treatment conditions.

The adjustment device may thus be arranged to enable the proportion of a product in the dispensed solution to controlled continuously or in steps, for example of <NUM>% or less.

The adjustment device is preferably arranged so that the content of a product injected into the water may vary for example between <NUM> and <NUM>% by weight.

The system may be arranged to dispense an amount of a product and/or a product with a given concentration, selected by the user prior to the dispensing of the product, in order to test or to use a predefined formulation. For example, the user selects, on the user interface, the concentration of the product and the latter is dispensed with said concentration.

As a variant, the system is arranged to dispense at least one product with a concentration which is variable over time, especially during a session at the sink or from one appointment to another, so as to enable the user to carry out tests at different concentrations, or with different amounts, of product. When the concentration and/or the amount varies during the session at the sink during the same appointment, the user may make use of this to test the solution dispensed on several distinct parts of the head of hair, and determine, in light of a result on each of these parts of the head of hair, the concentration and/or the amount of product most suited to obtaining the desired result.

The system may be arranged to propose at least one program referred to as "wash test".

The system is then arranged such that, during the execution of such a program, the system conveys a variable proportion, for example an increasing proportion, of a product into the dispensing device. In this way, if the shampooer sees that the product is foaming correctly on the head of hair and/or washing correctly, he or she may stop the dispensing and/or identify the optimal point during this test program. The system may be arranged to store in memory the total amount of product conveyed, for example after carrying out an integration. The system may be arranged to subsequently propose several implementations with the same amount of product, but distributed according to different programming and/or over a different period of time. For example, the shampooer will have varied the injection of the product into the stream of water according to an increasing mode, starting from a proportion of product of <NUM>% and regularly increasing the percentage by <NUM>% every second. If the shampooer identifies that, after <NUM> seconds, the foam obtained is satisfactory, he or she may then stop the system. By integration, the system calculates that the amount of product injected during the test corresponds to a regular supply at <NUM>% over <NUM> seconds. Starting from this information, the system will be able to propose several implementations:.

The system may be arranged to propose, to the user, a program referred to as "wash test", consisting in conveying a variable proportion, for example an increasing or decreasing proportion, automatically or at the shampooer's request, of a product relative to another into pipes of the system with a view to dispensing it by the dispensing device. It is then possible for the shampooer to sense the proportion most satisfactory to him or her, for example by touching the hair during the conveying. In this way, if the shampooer sees that the product is foaming correctly on the head of hair and/or washing correctly, he or she may stop the test program and/or identify the optimal point. The system then retains the total amount of product conveyed, for example after carrying out an integration, and will then be able to propose several implementations with the same amount of product, but distributed according to different programming and/or over a different period of time, as mentioned above.

A program variant which may be proposed to the user by the system, consists in conveying two or more than two products in a given relative proportion into the pipes, and in increasing the proportion conveyed of a product relative to the other or the proportion of this mixture in the water, automatically or at the shampooer's request. It is then possible for the shampooer to sense the proportion most satisfactory to him or her, for example by touching the hair during the conveying. In this way, if the shampooer sees that the product is foaming correctly on the head of hair and/or washing correctly, he or she stops the program and/or identifies the optimal point. The system will then retain the satisfactory parameters, for example the total amount of the mixture of products conveyed, for example after carrying out an integration, and will then be able to propose several implementations with the same amount of product, distributed according to different programming and/or over a different period of time. For example, the shampooer will have varied the injection of two products into the stream of water according to an increasing mode for one and a regular mode for the other, starting from a proportion of product of <NUM>% and regularly increasing the percentage by <NUM>% every second for the first and by <NUM>% for the second. If the shampooer identifies that, after <NUM> seconds, the foam obtained is satisfactory, he or she may then stop the system. By integration, the system calculates that the amount of product injected during the test corresponds to a regular supply at <NUM>% over <NUM> seconds for the first and <NUM>% over <NUM> seconds for the second. Starting from this information, the system will be able to propose conveying the two products in a <NUM>/<NUM> ratio under different implementations:.

The system preferably makes it possible to input information relating to the result obtained after the washing. In particular, the system may have information input relating to rinsing parameters, in order to be able to reuse them subsequently. The shampooer may then find the optimal rinsing depending on whether he or she wishes for the hair to be perfectly clear or to still carry some traces of product and thereby obtain an effect.

During rinsing, he or she may thus input information into the system relating to the quality of the hair and the speed of rinsing. The system may be arranged to take account thereof in order to modify settings or suggest testing new settings. The same applies during combing and the application of an optional application of another shampoo, conditioner, mask, or other products, and other hair treatment steps such as haircutting, hair setting, blow drying, straightening, etc..

Thus, if the shampooer or the client or the hairdresser notices that the hair is too coarse, difficult to disentangle, too weighed-down, etc., it is possible to input information into the system afterwards or later. The system is advantageously arranged to deduce therefrom modifications to be carried out or to propose for the setting; in addition, the choice by the system of the catalog product(s) proposed to the client will advantageously be made by taking this information feedback into account.

The system is preferably suited to hair products other than shampoo. It is thus possible to dispense, by means of the dispensing device, products such as other surfactant-based or non-surfactant-based compositions, intended to provide a care effect, with or without washing effect, for example formulations referred to as "no-poo" or "low-poo", conditioners and masks, or formulations based on diluted surfactants, among other products.

The system may also be arranged to propose a program referred to as "care test".

The system may then be arranged such that, during the execution of such a program, the system conveys a variable proportion, especially an increasing proportion, of a product into the pipes with a view to dispensing it via the dispensing device. In this way, if the shampooer sees that the product is caring well for the head of hair, he or she may stop the running of the program and/or identify the optimal point during the test program. The system then retains the total amount of product conveyed, for example after carrying out an integration, and is then able to propose several implementations with the same amount of product, but distributed according to different programming and/or over a different period of time, as mentioned above.

The system may further be arranged to propose another program consisting in conveying a variable proportion, for example an increasing or decreasing proportion, automatically or at the shampooer's request, of a product relative to another in the pipes. It is then possible for the shampooer to sense the proportion most satisfactory to him or her, for example by touching the hair during the conveying. In this way, if the shampooer sees that the distributed solution is caring well for the head of hair, he or she stops the test program and/or identifies the optimal point. The system will then retain the total amount of product conveyed, for example after carrying out an integration, and will then be able to propose several implementations with the same amount of product, but distributed according to different programming and/or over a different period of time, as mentioned above.

Another program consists in conveying two or more than two products in a given relative proportion into the pipes, and in increasing the proportion conveyed of this mixture in the water, automatically or at the shampooer's request. It is then possible for the shampooer to sense the proportion most satisfactory to him or her, for example by touching the hair during the conveying. In this way, if the shampooer sees that the product is caring well for the head of hair, he or she may stop the test program and/or identify the optimal point. The system will then retain the total amount of the mixture of products conveyed, for example after carrying out an integration, and will then be able to propose several implementations with the same amount of product, but distributed according to different programming and/or over a different period of time, as mentioned above.

The system preferably makes it possible to integrate information after applying a treatment solution.

In particular, the system may, automatically or non-automatically, have information input relating to rinsing parameters, in order to be able to reuse them subsequently. In particular, the system may be arranged to determine the amount of rinsing water used, and store this parameter in memory. The shampooer may then find the optimal rinsing depending on whether he or she wishes for the hair to be perfectly clear of product or to still carry some traces of product and thereby obtain an effect such as care, shine, etc..

In particular, during rinsing, he or she may thus input information into the system relating to the quality of the hair and the speed of rinsing. The system may then take account thereof in order to modify the settings, for example of water flow rate, or suggest testing new settings, for example carrying out the rinsing at a different flow rate. The same applies during combing and the application of a conditioner, mask, or other products, and other hair treatment steps such as haircutting, hair setting, blow drying, straightening, etc..

Thus, if the shampooer, the client or the hairdresser notices that the hair is too coarse, difficult to disentangle, too weighed-down, etc., it is possible to input information into the system immediately afterwards or later. The system may be arranged to deduce therefrom modifications to be carried out or to be proposed, by virtue of its knowledge of the effects of the products on the parameter that it is sought to correct.

It is possible to combine the application of one or more shampoos and one or more care products. In this case, use may be made of a "wash test" or "care test" program or else a specific program. By virtue of this approach, it is possible to bring together, in a single application, washing and care.

The system is advantageously arranged to make it possible to test a succession of products. Thus, a "succession test" program makes it possible, for example, to test one of the following sequences, or to test them successively during successive visits to the salon:.

By varying the different parameters of the treatment carried out at the sink, this approach makes it possible to find, and record, the sequence leading to the best results.

When a catalog product is proposed by the system, this proposal may be accompanied by a recommendation regarding the use of this product, for example within a particular treatment sequence.

The system may be arranged to carry out tests on the head of hair with a different water flow rate than that which is used subsequently; this is facilitated by using a dispensing device with a low flow rate, such as that disclosed in the publication <CIT>.

The system is then advantageously arranged to calculate, as a function of a new flow rate, for example adjusted by the user on the user interface, the amounts of products to convey to obtain an equivalent result. For example, a product test is carried out with a water flow rate of <NUM>-<NUM>/min, and subsequently the treatments are carried out with another water flow rate, for example <NUM>-<NUM>/min.

The system may be arranged to take into account, in the calculation of the amount of a product to inject into the water as a function of the water flow rate, the fact that at a higher water flow rate, a greater proportion of product is liable to be lost if it leaves through the sink outlet; thus, the system may be arranged to apply a law for correction of the amount as a function of the flow rate, which law is non-linear, to take into account the loss of product which increases with the flow rate; the system may further be arranged to compensate for the amount of product lost as a function of the flow rate by increasing the concentration of product in the treatment solution which is conveyed and/or by modifying the duration for which the solution is dispensed.

The system may be arranged to automatically control the opening or closing of the sink outlet as a function of the nature of the treatment; for example, during rinsing, the system orders the opening of the outlet; on the other hand, during the distribution of a predefined product, a conditioner for example, the system orders the closing of this outlet.

The system according to the invention enables the shampooer to optimize the nature of the products, the amounts applied and also the amount of rinsing water. It makes it possible to record the tests and optimal settings. The user may therefore improve performance beyond that which would have been possible by their skills of assessment.

The invention may make it possible for the user to reuse settings, to improve them and to adapt them to changes in the head of hair. This enables savings of time and of product. Moreover, since the user does not have to reproduce the settings during the client's subsequent visits, he or she subsequently takes only a very short amount of time to satisfy the client.

The invention also makes it possible to reduce water losses, when the system is created such that the information relating to optimal rinsing is retained and reused.

The invention further makes it possible for the user to test new mixtures and new treatment sequences, optimized for a given client or for testing on other clients.

In one exemplary embodiment of the invention, the user shares this information, in particular via digital connections, to inform other salons.

Thus, another subject of the invention is a set of systems according to the invention, present in different salons, configured to share information with one another, especially relating to settings and/or sequences considered to be optimal for given types of heads of hair. The systems may especially communicate via a shared database which they may remotely interrogate and input information into.

The system may be arranged such that a given hairdresser may search a database, by means of the client's identification, for example by their name, by an email address, by a pseudonym, by a client number, etc., of a description of the head of hair, for example volume, length, ethnicity, etc., or of a description of a history, for example number of dyeing operations, use of dyes of brand Y, etc., in order to receive from the system, by comparison, a setting and/or treatment sequence proposal.

The invention may also serve for a salon or a shampooer to build up a professional identity, recognizable by the mixtures and successions that they provide.

The system may be arranged to make it possible, via the user interface, to input an item of information relating to the products for washing hair used by the client, in order to make it possible, by interrogating a database relating to these products, to generate a setting making it possible to reproduce the action of this product as closely as possible. This enables a client who is very satisfied with a product to have their hair treated at the sink in an equivalent way, on their request.

The system according to the invention may also have at least one of the characteristics listed below, or any combination thereof:.

Another subject of the invention is a process of treating hair by means of a system according to the invention, in which at least one setting is selected on the user interface and at least one item of information relating to a result obtained with this setting is input to the interface.

In one exemplary embodiment of the invention, a result observed for a given setting is compared with an expected setting by interrogating a database, and at least one product recommendation and/or treatment recommendation is generated as a function of the result of this comparison.

The product recommendation be made for example by comparison with characteristics of catalog products featured in a database. The recommendation is preferably made after interrogating a database giving information on available stock in the salon.

It is possible to store the setting in memory with a view to a subsequent treatment, and the result observed on the hair and/or a recommendation of a modification of the setting and/or of the product for the subsequent treatment is preferably also stored in memory, as well as preferably an ID for the person treated, the storage and memory taking place especially on a remote server and/or on a removable memory medium.

In order to determine the optimal concentration and/or amount of at least one product used to treat the hair, it is possible, by means of the system according to the invention, to vary the content of at least one product in the water conveyed to the head of hair, as explained above.

In order to more readily compare the results obtained, it is possible to treat a part of the head of hair with a given setting, then to modify the setting to treat another part of the head of hair. It is possible to proceed in this manner with thirds or quarters of the head of hair, for example.

It is advantageous to store in memory in the system a setting corresponding to a result deemed to be satisfactory, with a view for example to being able to readily reproduce it during the client's next visit. This setting is then advantageously associated with a client ID.

The system may be arranged to automatically vary the amount of a product in the water conveyed to the hair, especially in an increasing manner, and to store in memory an item of information input by the user when the result is deemed to be satisfactory by said user. The user may for example stop the change in the setting when he or she considers the result to be satisfactory, and the system may automatically store the corresponding setting in memory.

Preferably, the opening or the closing of the outlet of the treatment sink is controlled as a function of the nature of the operation taking place, especially the treatment or rinsing operation.

It is possible to test different treatment sequences on different parts of a head of hair, in order to determine the sequence leading to the result closest to that expected.

At least two sequences may differ by a rinsing duration and/or by the presence or absence of a pre-shampooing operation, a conditioning operation or a rinsing operation.

The process according to the invention may also have at least one of the following characteristics, considered in isolation or in combination:.

Further features and advantages of the present invention will become apparent from reading the following detailed description of nonlimiting exemplary embodiments thereof and from examining the appended drawing, in which:.

<FIG> represents a system <NUM> according to the invention, to be connected to a cold water inlet C and preferably also, as illustrated, to a hot water inlet H.

This system <NUM> is intended to be used in a hairdressing salon to treat the head of hair B of a client whose head is positioned over a washing sink <NUM> which serves to collect the water and the product(s) used to treat the head of hair. This sink is, as is known per se, connected to an outlet system for waste water. The system <NUM> comprises a certain number of connectors and pipes which make it possible to convey the water to a dispensing device <NUM> such as a small shower connected to a flexible hose <NUM>.

In accordance with the invention, the system <NUM> comprises one or more sources of products for treating the head of hair, for example two products P1 and P2 in the example in question, contained in respective tanks <NUM> and <NUM>.

A collection device makes it possible to collect, in a dosed manner, each of the products P1 and P2 with a view to dispensing them via the dispensing device <NUM>. The different products P1, P2 are dosed under the control of an adjustment device <NUM> comprising, in the example in question, an electronic unit provided with computer means enabling it to communicate with a user interface <NUM>, schematically represented in <FIG>, and also with one or more databases, in this instance numbering two, with the references BD1 and BD2 in the example in question.

The database BD1 gives information relating to the characteristics of the commercial products, referred to as "catalog" products, present on the market, and preferably also indicates, from among the products referenced, those which are available in stock in the salon to be sold to clients or available in stock in an online shop which will send the products to the clients. The database BD2 gives information relating to the characteristics of the products used by the system <NUM>.

In a variant embodiment of the invention, the system <NUM> only comprises a single product and the adjustment device <NUM> may vary the amount and/or the concentration of this product during the treatment of the head of hair B.

In the illustrated example, the system <NUM> comprises temperature control means, such as a mixer <NUM>, controlled by the adjustment device <NUM>, to mix hot water with cold water in order to dispense water with the dispensing device <NUM> at the desired temperature.

The system <NUM> may also comprise a flowmeter <NUM>, giving information to the adjustment device <NUM> relating to the flow rate of the water conveyed to the dispensing device <NUM>, and, by integration, relating to the amount of water dispensed.

The system <NUM> may also, where appropriate, comprise one or more other sensors, not illustrated, giving information to the adjustment device <NUM> relating to the amount and/or the flow rate of each of the products conveyed to the dispensing device <NUM>.

In the illustrated example, the products P1 and P2 are collected by means of metering pumps <NUM>, for example of peristaltic type or having a motorized piston, controlled by the adjustment device <NUM>. Nonreturn valves <NUM> may be present downstream of the pumps <NUM>, these valves <NUM> opening under the dispensing pressure of the pumps <NUM>.

It may prove beneficial to convey the water to the hair with a low flow rate, by increasing the pressure provided at the dispensing device <NUM> by means of a pressure booster <NUM>. An example of a dispensing device operating with a low flow rate is disclosed in <CIT>. The dispensing device then comprises nozzles which direct jets which converge on one another, in order to cause them to break up.

The product(s) used by the system <NUM> are for example products for treating the head of hair used during the shampooing thereof, and more generally during a client's session at the sink in the salon. They may be conditioning treatments, masks, shampoos, preshampoos or conditioners.

The products may especially comprise anionic surfactants, amphoteric surfactants, cationic polymers and/or silicones. The products may especially comprise sulfate-containing or non-sulfate-containing, nonionic or cationic surfactants, polymers, especially carbon-based or silicone polymers, thickeners, fatty substances such as oils and/or waxes, water and optional solvents.

Each product P1, P2 is preferably contained in a container which is easily connected to the system <NUM>. For example, the system <NUM> comprises quick connectors, which enables easy replacement of an empty container.

The product(s) may be contained in flexible pouches which deform as they are emptied, so as to enable containers to be emptied without taking up air, for better preservation of said containers.

The initial amount of each treatment product in the corresponding container is for example between <NUM> and <NUM> liter.

In the example in question, the products P1, P2 are injected into the water which is then conveyed to the dispensing device <NUM>. The adjustment device <NUM> may control the duration of operation of the pumps <NUM> and also the flow rate thereof in order to control the amount of product conveyed to the head of hair B and the flow rate with which the product is injected.

The system <NUM> may make it possible, by virtue of the user interface <NUM>, to vary the amount of each of the products conveyed to the head of hair, and also, where appropriate, the concentration of these products in the water which is dispensed by the dispensing device <NUM>.

In variant embodiments, not illustrated, the product(s) are conveyed directly at the dispensing device <NUM>, and the adjustment device <NUM> controls the amount of each of the products which is dispensed onto the head of hair by the dispensing device <NUM>. In such an example, the adjustment device <NUM> then essentially adjusts the amount of each of the products which is conveyed to the head of hair and not the concentration of the products. It is further possible as a variant to use, as sources of products, the same composition at several concentrations, the products corresponding to these different concentrations being contained in respective containers, and to send the product which corresponds to the selected concentration to the head of hair by collecting it from the corresponding container.

In another variant embodiment, the system <NUM> is arranged to carry out pre-mixing of a selected product with water in order to modify the concentration thereof by diluting it, then the result of this mixing is conveyed to the dispensing device <NUM> via a specific pipe. This makes it possible to avoid diluting each of the products in too great an amount of water and/or improves the dilution of the product in the water, such as, for example, for oil-based products.

As a further variant, the system <NUM> is arranged to carry out premixing of several products with one another in predetermined ratios in order to produce a mixture to be injected into the water to produce a treatment solution.

The system <NUM> may further be arranged to convey, to the dispensing device <NUM>, a formula having a ratio between two products, and/or a dilution factor in water of at least one product, which is variable over time and/or as a function of the amount of water dispensed onto the head of hair. The variation of the ratio(s) may be controlled automatically over time by the system, when executing a test program for example, or be controlled manually by the shampooer.

The system <NUM> may be arranged to indicate to the shampooer, via the user interface <NUM>, the amount of a product already dispensed onto the head of hair and/or the amount of product remaining in the corresponding container.

The system <NUM> may also be arranged to indicate, preferably in real time, the amount of a product remaining to be dispensed and/or to be dispensed during the treatment.

The system may be arranged to indicate the amount of water dispensed, and/or the water flow rate, and also the temperature thereof, where appropriate.

All these items of information are, for example, displayed on a screen <NUM> of the user interface <NUM>.

When the adjustment device <NUM> has to act on the dilution factor of a selected product, the amount of product which is conveyed by the corresponding pump may be adjusted as a function of the flow rate measured by the flowmeter <NUM>.

The mixture of water and of product or a single product may be conveyed with a flow rate of less than or equal to <NUM>/min by the dispensing device <NUM>.

The user interface <NUM> may be embodied in various ways. Preferably, the user interface <NUM> is located close to the sink <NUM>, so as to enable the shampooer to modify the treatment parameters and especially to select one or more products to be dispensed onto the head of hair B and also the amount and/or the content of these products of the water conveyed to the head of hair. The adjustments are made for example by means of keys <NUM> making it possible to increase or decrease selection parameters and/or amounts or concentrations.

Where appropriate, the user interface <NUM> also has a button for setting the temperature of the water, the mixer <NUM> being for example motorized. As a variant, the system <NUM> comprises a temperature probe and solenoid valves which make it possible to adjust the flow rate of hot water and of cold water so as to comply with a setpoint temperature.

The user interface <NUM> may also comprise one or more buttons <NUM> making it possible to select actions and/or parameters in the menu displayed on the screen <NUM>. In variants, the screen <NUM> is a touchscreen.

The user interface <NUM> may further comprise voice recognition and/or be constituted by a terminal of tablet or smartphone type, communicating with the adjustment device <NUM>.

The user interface <NUM> may receive information transmitted remotely from, for example, a computer of the salon, a tablet or a cell phone.

In one variant, at least part of the user interface <NUM> is present on the dispensing device <NUM>.

Preferably, the user interface <NUM> is protected from water splashes and makes it possible to carry out adjustments and/or input information with wet fingers.

The user interface <NUM> is configured in the described example to enable the shampooer to input one or more items of information relating to the treatment carried out. For example, the shampooer may grade different parameters linked to the use of a product on a predetermined scale of values; for example, the user interface <NUM> is configured to enable the shampooer to input information relating to the speed of foaming, the volume of foam, the speed of rinsing, the ease of disentangling and/or the effectiveness of cleansing. This information is for example a score, for example a number or a letter, or a symbol, for example of emoticon type.

The user interface <NUM> may be configured to enable the user to select a prerecorded and pre-characterized formula. In this case, the system <NUM> carries out the adjustment which corresponds to the selected formulation.

The user interface may be arranged to enable the user to select a particular test program, with a view, for example, to testing a washing or care product or a particular treatment sequence.

Advantageously, the test program automatically varies at least one treatment parameter, so as to enable the user to test different formulations, for example, on respective parts of the head of hair. Passing from one test phase to another, with a change in the formulation, for example modification of the concentration of a product or of the amount dispensed, may be indicated by the user interface by emission of a sound and/or visual message; the system may also be arranged to stop and wait for a specific action from the user on a restart button for example, before continuing the test program with the modified formulation.

The adjustment device <NUM> may comprise a circuit containing a microprocessor or containing a microcontroller and a power interface making it possible to control solenoid valves and/or pumps and/or other motors in order to produce the dosages corresponding to the selected treatment configurations.

Preferably, as illustrated, the adjustment device <NUM> is arranged to communicate with the databases BD1 and BD2. These databases are, for example, accessible on a computer network of the salon or on a remote server to which the salon is connected, for example via a secure or non-secure Internet connection.

As a variant, the databases BD1 and BD2 are internal to the adjustment device <NUM>, being recorded in a memory thereof. In this case, it is possible to provide, for example, that the adjustment device <NUM> carries out periodic updates of the information contained in its databases by interrogating a server of the salon or a remote site.

The adjustment device <NUM> may receive, by virtue, for example, of an analog and digital interface, signals originating from various sensors, for example of temperature, of pressure and/or of flow rate, and also, where appropriate, signals giving information relating to the filling level of the containers containing the products to be used to treat the head of hair.

The assembly of the adjustment device <NUM> may be located close to the washing sink <NUM>, for example in a casing which is sealed against water splashes; as a variant, the adjustment device <NUM> comprises at least one electronic circuit close to the sink <NUM> and at least one electronic circuit at a distance, communicating via a wired or wireless connection with the electronic circuit(s) present close to the sink <NUM>.

The system <NUM> may comprise one or more sensors making it possible to measure at least one characteristic of the head of hair before cleansing it, for example a comb to be passed through the hair, provided with a microphone or any other sensor which can sense the state of the hair, making it possible to convey a signal representing the state of the hair before treating it. In this case, the adjustment device <NUM> may be arranged to recommend a setting and/or a choice of products as a function of the evaluation which has been made, making use of reference data for this purpose. The sensor(s) may further be used to evaluate a result of treating the head of hair by means of the system <NUM>.

In one variant, the system <NUM> is arranged to display, on the screen <NUM> of the user interface <NUM>, a questionnaire which the shampooer fills out and, as a function of the results of this questionnaire, to make a suggestion of a setting or of a modification of said setting.

Preferably, the user interface <NUM> and/or the adjustment device <NUM> may download data relating to the client whose hair is going to be treated, in order to remind the shampooer of past treatment setting(s), observed result(s) and also the recommended setting(s) for the treatment to be carried out.

The system <NUM> preferably comprises a means to store at least one setting in memory.

The setting may be stored in memory at the shampooer's request, for example by pressing a button for this purpose on the user interface <NUM>. As a variant, the setting is automatically stored in memory as soon as a treatment result is input. The setting may be stored in memory on a removable memory medium introduced into the adjustment device <NUM>, and/or in a remote database with which the system <NUM> is in communication.

The system <NUM> may be configured to control the outlet of the sink <NUM>, by acting, for example, on a solenoid valve <NUM>, in order especially to open it or close it as a function of the treatment or rinsing requirement. For example, when the dispensing device <NUM> dispenses a product, the outlet is closed so as to enable the user to treat the hair with the amount of water and of product dispensed, the product being in a known amount like the water; once the hair has been treated, the outlet is opened to proceed to the rinsing, for example.

An example of a process for treating the head of hair according to a first embodiment, making it possible to determine a product in stock to recommend to the client for their personal use, will now be described with reference to <FIG>.

Firstly, in step <NUM>, the shampooer adjusts the amount of product and/or the concentration of product by virtue of the user interface <NUM> of the system <NUM>, and may also indicate the choice of product that he or she wishes to use.

As a variant, the shampooer makes the adjustment by adjusting the desired treatment characteristics by virtue of the user interface <NUM>, and the system <NUM> consults the database BD2 to determine a formula which appears to come close to these criteria.

Adjustment information may be input as mentioned above, following an assessment questionnaire and/or a measurement carried out on the head of hair of the client whose hair is going to be treated.

It is further possible for the step of selecting the settings to be automatic and to result from downloading data specific to the client whose hair is going to be treated, which data are located for example on a memory medium, such as a USB stick, provided by this client. The data may further be present in a file recorded on their cell phone or downloaded from a database inside the hairdressing salon or outside it.

Downloading data relating to previous treatments undergone by the client may enable the shampooer or the system <NUM> to propose a setting suggestion when the treatment results observed during previous treatments are not entirely satisfactory.

On the other hand, if the correct settings have been found from previous treatments, for example in terms of products used, amount conveyed to the head of hair and also, where appropriate, the chronology of use of different products, then the system <NUM> may simply signal to the shampooer that the setting parameters that the system <NUM> proposes to use are those which have been considered to be satisfactory during previous treatments, such that the shampooer only has to confirm the proposal made by the system. In order to find the correct settings and/or the correct treatment sequence, the user may have carried out successive tests with the assistance of the system <NUM> by virtue of pre-existing test programs as described above.

Next, in step <NUM>, the system <NUM> conveys the selected product(s) to the head of hair in the concentrations and/or with the amounts selected to carry out the treatment.

A concentration and/or an amount may be adjusted in various ways and for example the shampooer may simply indicate a desired level of strength of the product.

For example, the shampooer may select, from the user interface <NUM>, from several degrees such as "less concentrated", "normal concentration", "more concentrated" and the system <NUM> produces the corresponding dosage.

In step <NUM>, the shampooer may observe the treatment results with regard to one or more criteria and, on the basis of these observations, input information into the system <NUM> by virtue of the user interface <NUM>.

The shampooer may for example grade the following criteria: speed of foaming, volume of foam, speed of rinsing, ease of disentangling and effectiveness of cleansing, classifying them as "satisfactory", "too high" or "not high enough".

The system <NUM> may then, in step <NUM>, compare the observed results with the results expected for the applied product by interrogating the database BD2 for the products used by the system, this database BD2 giving information relating to the same criteria as those which are the subject of the evaluation.

The system <NUM> is therefore able, when at least one of these evaluated criteria is classified as unsatisfactory for a product used, to generate a new suggestion to come close to the result expected with this product.

The system <NUM> may also weight criteria according to its assumed importance for the client, and propose a product which favors a result deemed to be a priority for a client.

Once the product(s) which make it possible to best treat the head of hair have been identified, the system may interrogate, in step <NUM>, the database BD1 in order to determine the catalog product(s) closest to the treatment conditions tested or the treatment conditions which would have made it possible to come close to the expected result.

As a variant, the system <NUM> is able, when at least one of the criteria is classified as unsatisfactory with the product used, to interrogate the database BD1 in order to determine the catalog product(s) having adequate characteristics as a function both of the expected results in light of the product and criteria to improve.

The system <NUM> may also determine, by interrogating the database BD1 or an additional database inside the salon, the product(s) available in stock in the salon, and on the basis of this interrogation provide a product recommendation in step <NUM>.

When none of the products present in the database BD1 is entirely satisfactory in light of the desired criteria, the system <NUM> may be arranged to advise a product which comes as close as possible to these criteria and give usage advice to improve the action of the product and come close to these criteria. For example, the system <NUM> may be arranged to deliver usage advice on a product having a slightly inferior disentangling strength to that desired, by carrying out a shorter rinsing. As a variant, the system <NUM> advises using a product having a slightly inferior disentangling strength to that desired and a weakly dosed disentangling conditioner.

The system <NUM> may also be arranged to determine a pair of products to recommend to a client for an adequate treatment of their hair.

The system <NUM> is configured, in the example in question, to record or propose storing in memory, in step <NUM>, a certain amount of data generated when the client is treated.

This data may be combined with a client ID, so as to be able to be recovered subsequently, for example when the client's head of hair is treated again.

The system <NUM> may be configured to make it possible to determine a succession of two adequate products, such as a pre-shampoo and a shampoo or a shampoo and a conditioner, making it possible to obtain a desired result.

In a variant embodiment of the invention, the shampooer applies different products or products in different concentrations on respective locks of hair, in order to more readily compare the action of these products or setting on the head of hair.

For example, the shampooer separates the head of hair into locks of hair and uses one product per lock of hair to compare the action of different products on the head of hair, with a view to selecting the most suitable product for the head of hair. The characteristics of the product retained may then be compared to those of catalog products from the database BD1 in order to determine the product in stock to be recommended to the client. In this case, the characteristics of the products for which information is given in the database BD1 are, for example, amongst other items of information, the contents of the various components of the formula, for example the level of anionic surfactants, of amphoteric surfactants, cationic polymers and of silicones.

In this example, the system <NUM> has a database BD1 of commercial products available in stores.

This database BD1 gives information, for each product listed therein, on the following usage characteristics:.

The system <NUM> also has a database BD2 giving information on the same usage characteristics for the products integrated into the system <NUM>.

In the example, the database BD1 lists the following products A to D:.

The characteristics of the products A to D indicated in the database BD1 are given in the table below.

The value <NUM> indicates poor performance and the value <NUM> indicates very good performance.

The shampooer carries out a test on their client with a product X, conveyed into the water of the system <NUM> and dispensed onto the head of hair by the dispensing device <NUM>. He or she notes what he or she observes, identifying if the performance is satisfactory, too high or not high enough, classifying them in terms of estimated importance (number <NUM> corresponding to the least important criterion and number <NUM> to the most important criterion) for their client. He or she notes the following result:.

The system <NUM> compares the performance noted by the shampooer relative to the characteristics conventionally expected for the product X in the database BD2.

Then, seeing the shortfall in what is deemed to be the main criterion, namely criterion <NUM>) relating to the treatment (disentangling) strength, the system <NUM> searches in the database BD1 for the product which would be best suited to satisfy this criterion.

It identifies two products, B and C, having a superior treatment strength than that of the tested formula and hence being potential candidates.

The system <NUM> will identify if the formula B should be chosen since it is the most treating.

As the system knows that, by passing to formula B, the foaming and rinsing speeds will be reduced, the system proposes testing B.

The shampooer then registers the performance. He or she notes that the treatment criterion is adequate but that the foaming (speed of foaming) is insufficient for the head of hair tested.

The system <NUM> then proposes the formula C, the treatment performance of which remains good and the foaming strength of which is high. He or she registers the performance, arriving at the conclusion that the formula C is preferred, and inputs this information into the system <NUM>.

The system <NUM> then deduces two pieces of advice which it proposes to the shampooer:.

A variant of a process for treating the head of hair will now be described with reference to <FIG>, which variant makes it possible to more easily adapt the product(s) and/or treatment sequences to the client's head of hair.

Firstly, in step <NUM>, the shampooer selects, by virtue of the user interface <NUM>, a predetermined test program.

The system <NUM> may be configured such that the shampooer may, by pressing a key on the user interface <NUM>, manually give an instruction which causes a change in the concentration of the products relative to one another and/or relative to the water.

In a step <NUM>, the shampooer stops the system <NUM> when he or she observes that the desired result has been obtained, for example that the product is satisfactorily foaming, caring or washing, and identifies the optimal point. The system <NUM> may then calculate the amount of each product and of water applied in total, to obtain the result deemed to be optimal.

In a step <NUM>, the system <NUM> may propose several treatment implementations with the proportions of products and of water determined previously and/or refine the determination of the optimal point.

For example, the system <NUM> is arranged to propose treatment implementations with a higher flow rate of water and of product to reduce the treatment time and optionally a greater amount of product to take into account the greater proportion of product discharged into the sink <NUM> due to the higher water flow rate. In order to increase the amount of product, it is possible to increase the product application time and/or to increase the proportion of product.

In a step <NUM>, the shampooer rinses the head of hair and determines the optimal rinsing as a function of their desire or not to keep or remove traces of product on the hair. The system <NUM> may be configured to record an optimal rinsing parameter and to associate it with the product.

As a variant, for the optimal point determined previously, the system <NUM> gives the shampooer information relating to the corresponding optimal rinsing parameters.

The system <NUM> may also make it possible to test successions of different products to determine the most satisfactory succession of products. For example, the system <NUM> may be configured to convey one of the following sequences to the dispensing device <NUM>:.

The settings recorded during the optimization of the parameters may be recorded in a client database to be able to be reused during subsequent visits by said client. This makes it possible to gain time during subsequent visits.

In this example, one of the tanks of the system <NUM> is filled with the following product P1:.

On a first model with short hair, <NUM> seconds are needed to achieve a good degree of foaming, which gives approximately <NUM> of product P1 conveyed. On a second model with a long head of hair of approximately <NUM>, <NUM> seconds are needed, which gives approximately <NUM> of product P1 conveyed. This data is recorded nominally. The shampooer then rinses. He or she notes the time at which the rinsing is obtained satisfactorily: <NUM> seconds for the first model, i.e. approximately <NUM><NUM> of water, <NUM> seconds for the second model, i.e. approximately <NUM><NUM> of water.

Subsequently, the system <NUM> proposes that the shampooer uses the parameters in the following manner in order to reduce the treatment time:.

If the shampooer subsequently wishes to increase the flow rate, the system <NUM> recalculates the parameters taking into account any possible losses due to the fact that a portion of the product P1 flows directly into the sink <NUM> and is discharged directly because of the higher flow rate:.

In this example, the tanks P1 and P2 are filled with the following products P1 and P2:.

At the time of washing the hair, the shampooer adjusts the system <NUM> to convey <NUM>% of product P1 and <NUM>% of product P2 into the water with a flow rate of <NUM><NUM>/min. He or she treats a quarter of the head of hair.

He or she then makes a new adjustment with <NUM>% of product P1 and <NUM>% of product P2. He or she treats a second quarter of the head of hair.

He or she then makes a new adjustment with <NUM>% of product P1 and <NUM>% of product P2. He or she treats a third quarter of the head of hair.

He or she then touches the hair and rinses at a flow rate of <NUM><NUM>/min. He or she carries out the rinsing with <NUM><NUM>/min of water for <NUM> seconds. He or she notes the best touch sensations during rinsing and after rinsing. He or she determines that the best setting is that corresponding to <NUM>% of product P1 and <NUM>% of product P2 which he or she may then store in memory in the system <NUM> and use subsequently.

In the continuation of example 2B, the shampooer takes the setting he or she had chosen, i.e. <NUM>% of product P1 and <NUM>% of product P2. They reproduce the test from example 2B, but with the following settings:.

He or she carries out the rinsing with a water flow rate of <NUM>/min for <NUM> seconds.

He or she selects the best setting as a function of the results observed on the different quarter heads of hair, in this instance that corresponding to the third quarter treated, which he or she may then subsequently use.

In the continuation of example 3B, the shampooer takes the setting he or she had previously chosen, namely <NUM>% of product P1 and <NUM>% of product P2. They reproduce the test from example 2B, but with the following settings:.

After rinsing, he or she touches the hair then dries it. He or she selects the best rinsing operation, which he or she may store in memory in the system <NUM> and subsequently reproduce.

The shampooer reproduces the example 2B, placing the following products P1 and P2 in the tanks of the system <NUM>:.

The settings that he or she uses are as follows:.

After rinsing, he or she touches the hair then dries it. He or she selects the best results, and may store the corresponding ratio of the products P1 and P2 in memory in the system <NUM> and subsequently reproduce the formulation.

The shampooer reproduces the example 5B, placing the following products P1 and P2 in the tanks:.

The shampooer fills a tank with the product P1 as follows:.

At the time of washing the hair, the shampooer adjusts the system <NUM> to convey <NUM>% of product into the water with a flow rate of <NUM>/min. He or she applies the solution by means of the dispensing device on four models <NUM> to <NUM> with highlighted hair, the highlights of which are especially damaged, for <NUM> seconds, i.e. approximately <NUM> of product.

He or she then rinses all the heads of hair of the models for <NUM> seconds. After drying, he or she identifies the best situation for each of the models. In this example, for models <NUM> and <NUM>, the best setting is that with <NUM> seconds of rinsing. For the model <NUM>, the best settings are those with rinsing of <NUM> seconds, <NUM> seconds and <NUM> seconds, which give equivalent results. For the model <NUM>, the best setting is that with <NUM> seconds of rinsing, since it leads to a gain in body of the hair. The settings with rinsing for <NUM> and <NUM> seconds are satisfactory but do not lead to a gain in body.

Subsequently, the shampooer will be able to store this data in memory in the system <NUM> and use it to obtain the best setting for the models <NUM> and <NUM>.

He or she will also be able to offer a short or long rinsing to the model <NUM>, depending on whether or not this model wishes to benefit from a relaxing rinse.

He or she will also be able to offer a short or long rinsing to the model <NUM>, depending on whether or not said model wishes to benefit from a gain in body.

Needless to say, the invention is not limited to the examples that have just been given. For example, while the use of a dispensing device with convergent colliding jets supplied with high pressure is advantageous, the invention is not limited to such a device.

In the example illustrated, the products are injected upstream of the pressure booster <NUM>; in one variant, the injection occurs downstream.

In the case of the use of several products, it is possible to use a single multicompartment container.

The container(s) may be provided with identifiers which automatically give information to the system <NUM> relating to the identity of the products and/or relating to the composition and/or the nature of the product contained within. The database BD2 may, where appropriate, automatically update upon reading these identifiers.

Claim 1:
A system (<NUM>) for carrying out a treatment of the head of hair, especially a shampooing operation, to be connected to at least one water inlet, comprising:
- at least one source of cosmetic product (P1; P2),
- an adjustment device (<NUM>) making it possible to modify at least one usage characteristic of at least one product conveyed to the head of hair,
- a user interface (<NUM>), enabling said user:
∘ to select a setting, the system (<NUM>) being configured to act on the adjustment device (<NUM>) as a function of the selected setting, and
∘ to input at least one item of information relating to a treatment result obtained with the selected setting,
- a means for generating a product recommendation and/or a treatment recommendation on the basis at least of the knowledge of the selected setting and of said at least one item of information input by the user relating to the treatment result.