A New Process for the Preparation of Depilatories.
Year: 1889

page_text: Date of Application, 12th Nov, 1889
Complete Specification Left, 16th Apr., 1890-Accepted, 17th May, 1890
PROVISIONAL SPECIFICATION.
A New Process for the Preparation of Depilatories.
I, JACQUES PERL, of No. 7 Scharnhorst Strasse, Berlin, German Empire, doctor of
philosophy, do hereby declare the nature of this invention to be as follows:-
This invention relates to a new process for preparing depilatories, as well as the
preparations resulting therefrom.
The principle upon which these new depilatories are based consists in the employ-
ment of the sulphuretted derivatives of strontium in any of their chemical forms,
viz. -the mono-sulphide, the poly-sulphides, and the strontitic hydro-sulphides.
Amongst the known preparations employed for the same purpose, the strontitic
depilatories present the advantage of manifesting a very energetic action on hair,
while being perfectly harmless in all respects, so as to permit of a very extended use
in all cases where it is desired to remove hair.
Of the above named sulphuroited drivatives of strontium, the most advantageous
for the purpose of this invention is the mono-sulphide of strontium. Certain
precautions must however be taken in its preparation, as in its use. In the first
place the efficacy of the preparation increasing with its fineness renders it necessary
to treat the raw material very carefully; on the other hand, as the pure strontitic
mono-sulphide acts very energetically it must, for the greater part of its uses, be
moderated by mixing it with suitable attenuants.
In carrying out my process, I proceed as follows:-
I take, by preference, the strontitic sulphate, preferring celestine, or I may use
the artificially prepared sulphate. I reduce this sulphate to a very fine powder
which I treat by elutriation. I mix the washed sulphate with substances capable of
reducing the sulphate to high temperatures; these are, as is well known, charcoal,
starch, fecula, and the like. I mould this mixture into little tablets, balls, or other
forms which I consider suitable, and calcine these latter to a red heat. Under these
conditions the strontitic sulphate is converted into mono-sulphide of strontium. I
pulverise the product of the reaction, and I attenuate this fine powder by mixing it
intimately with suitable solid substances, preferring to employ those which are at
the same time energetic absorbents of moisture, for example, powdered fossil flour,
carbonate of calcium obtained by precipitation, and others. After attenuation the
preparation is ready for use as a depilatory.
Instead of the mono-sulphide of strontium I may use the strontitic poly-sulphides
produced in the usual way; the preparations thus obtained give, however,
depilatories whose action is less energetic. I can, furthermore, also have recourse to
the hydro-sulphides of strontium, but this substance presents loss advantage on
account of its liability to decomposition.
Numerous experiments having shewn that the soluble strontitic salts do not in any
wise manifest toxical qualities, the depilatories which I prepare by means of the above
named sulphuretted derivatives of strontium are perfectly harmless in this respect,
and being furthermore of an agreeable use they therefore permit of numerous
applications, and in particular in cosmetics and in therapeutic medicines.
Dated this 12th day of November 1889

page_text: the same is to be performed, to be particularly described and ascertained in and by the
following statement, that is to say :-
This invention relates to a new process for preparing depilatories, as well as the
preparation resulting therefrom.
The principle upon which these new depilatories are based consists in the employ-
ment of the sulphuretted derivatives of strontium in any of their chemical forms,
viz. the mono-sulphide, the poly-sulphides and the sulphhydrate.
:
Compared with the known preparations employed for the same purpose, the
strontitic depilatories present the advantage of manifesting a very energetic action
on hair while being perfectly harmless in all respects, so as to permit of a very
extended use in all cases where it is desired to remove hair.
Of the above named sulphuretted derivatives of strontium, the most advantageous
for the purpose of this invention is the mono-sulphide of strontium. Certain
precautions must, however, be taken in its preparation and in its use. In the first
place the efficacy of the preparation increasing with its fineness renders it necessary
to treat the raw material very carefully; on the other hand, as the pure strontitic
mono-sulphide acts very energetically, it must, for the greater part of its uses, be
moderated by mixing it with suitable attenuants.
In carrying out my process, i proceed as follows:
I take, by preference, the strontitic sulphate, preferring celestine, or I may use the
artificially prepared sulphate. I reduce this sulphate to a very fine powder which I
treat by clutriation. I mix the washed sulphate with substances capable of reducing
the sulphate at high temperaturos, these are, as is well known, charcoal, starch,
fecula, and the like. I mould this mixture into bricks, tablets, balls, or other forms
which I consider suitable, and calcine these latter to a red heat. Under these
conditions the strontitic sulphate is converted into mono-sulphide of strontium. I
pulverise the product of the reaction, and I attenuate this fine powder by mixing it
intimately with suitable solid substances preferring to employ those which are at the
same time energetic absorbents of moisture, for example fossil meal, flour, carbonate
of calcium obtained by precipitation, and others. After attenuation the preparation
is ready to use as a depilatory.
Instead of the mono-sulphide of strontium, I may use the strontitic poly-
sulphides produced in the usual way, the preparations thus obtained give, however,
depilatories whose action is less energetic. I can furthermore also have recourse to
the sulphhydrate of strontium, but this substance presents less advantage on account
of its liability to decomposition.
Numerous experiments having shewn that the soluble strontitic salts do not, in any
wise, manifest toxical qualities, the depilatories which I prepare, by means of the
above named sulphuretted derivatives of strontium, aro porfectly harmless in this
respect, and being furthermore of an agreeable use they permit of numerous
applications, and in particular in cosmetics and in therapeutic medicines.
Having now particularly described and ascertained the nature of my inven-
tion, and in what manner the same is to be prepared, I claim :-
1. The herein described process of manufacturing depilatorios, consisting in
reducing one or more of the above mentioned sulphides of strontium to a fine
powder and mixing the same with suitable attenuants.
2. A depilatory containing as its active agent one or more of the above mentioned
sulphides of strontium, substantially as described.
Waw
ERNEST De PASS,
78, Fleet Street, London, Agent for the Applicant.