Method for processing a light-sensitive silver halide color photographic material

Abstract: There is disclosed a method for processing a light-­ sensitive silver halide color photographic material in which a light-sensitive silver halide color photographic material having at least one silver halide emulsion layer is exposed imagewise to light and then subjected to processing includ­ ing at least a color development treatment or a color development treatment followed by a bleach-fixing treat­ ment, the improvement wherein said at least one silver halide emulsion layer is a silver halide emulsion layer in which not less than 80 mole % of the total silver halide in the layer is silver chloride and the pH value of the bleach-fixing solution used in said bleach-fixing treatment is in the range of 4.5 to 6.8.

Description: BACKGROUND OF THE INVENTION This invention relates to a method for processing a light-sensitive silver halide color photographic material. More particularly, the present invention relates to a method for processing a light-sensitive silver halide color photographic material, which enables quick processing and generates little stain caused in a bleach-fixing step and which can provide improved processing stability in quick processing. Recently, it has been desired, in the industry, to develop a technology which enables quick processing of a light-sensitive silver halide color photographic material and can provide stable or constant photographic performance of a processed photographic material. Namely, a light-sensitive silver halide color photographic material is subjected to running treatment by using an automatic developing machine provided in each laboratory for development. As a part of improved services for users or customers, it is required that a photograph should be printed and returned to a user or a customer within the day when a light-sensitive silver halide color photographic material to be developed is received. Recently, it is required even to return a printed material within several hours after receipt of a light-sensitive silver halide color photographic material to be developed. Thus, it has been in a hurry to develop a technology which enables quicker processing. The prior art technologies concerning quick processing of a light-sensitive silver halide color photographic material may be classified roughly into the following art: (1) technology relying upon the improvement of a light-sensitive silver halide color photographic material; (2) technology relying upon physical means at the time of development processing; and (3) technololgy relying upon the improvement of the composition of a processing solution used for development processing. As concerns the above-mentioned art (1), there have been developed, specifically, 1 ○ a technology which has improved the composition of a silver halide (see, for example, a technology of forming fine grains of a silver halide as described in Japanese Provisional Patent Publication (KOKAI) No. 184142/1983, and a technology of reducing the silver bromide content in a silver halide as described in Japanese Patent Publication (KOKOKU) No. 18939/1981; 2 ○ a technology of using an additive (see, for example, a technology in which an 1-aryl-3-pyrazolidone having a specified structure as described in KOKAI No. 64339/1981 is added to a light-sensitive silver halide color photographic material and a technology in which a 1-arylpyrazolidone as described in KOKAI Nos. 144547/1982, 50534/1983, 50535/1983 and 50536/1983 is added to a light-sensitive silver halide color photographic material); 3 ○ a technology using a coupler having a rapid reactivity (see, for example, a technology using a yellow coupler having rapid reactivity as described in KOKOKU No. 10783/1976, and KOKAI Nos. 123342/1975 and 102636/1976); and 4 ○ a technology for providing a thinner film or layer which constitutes a photographic material [see, for example, a technology for providing a thinner film or layer which constitutes a photographic material as described in KOKAI No. 65040/1987 (Japanese Patent Application No. 65040/1987)]. As to the above-mentioned art (2), there is a technology of stirring a processing solution (see, for example, a technology of stirring a processing solution as described in Japanese Patent Application No. 23334/1986). As to the above-mentioned art (3), there have been known 1 ○ a technology using a development accelerator, 2 ○ a technology of concentrating or thickening a color developing agent, 3 ○ a technology of lowering the halide ion (particularly, bromide ion) concentration in a processing solution, and so on. Basically, the processing of a light-sensitive material includes two steps, i.e., a color development step and a desilverization step. The desilverization step includes a bleaching step and a fixing step or a bleach-fixing step. As additional processing steps other than the above, there may be added a rinsing treatment, a stabilizing treatment, a water-washing step or a stabilizing step replacing the water-washing step and so on. In color development, an exposed silver halide is reduced to silver and, at the same time, an oxidized aromatic primary amine series color developing agent is reacted with a coupler to form a dye. In the course of the reaction, halide ions which have been formed by the reaction of silver halides are dissolved into a developing solution and accumulated therein. Further, components such as a development inhibitor which have been contained in a light-sensitive material may also be dissolved out into a color developing solution and accumulated therein. In the desilverization step, silver formed by the development is bleached by an oxidizing agent and then all the silver salts are removed as soluble silver salts by a stabilizing agent from a light-sensitive material. It should be noted here that there has also been known a single-bath bleach-fixing process which carries out the bleaching step simultaneously with the fixing step. In cases where a typical light-sensitive material is processed with a single-bath bleach-fixing solution immediately after it is subjected to color development, the pH of such a bleach-fixing solution is usually maintained neutral (pH 7.0 - 7.5) or at a slightly higher value than neutral. In the case of a usual light-sensitive material, when the pH value is low, a Leuco dye is liable to be formed and a trouble which is referred to as so-called leuco dye formation is liable to occur. Therefore, the bleach-fixing solution is kept to be neutral or at a slightly higher pH value. Among the quick processing technologies as mentioned above, it is the above-mentioned art (1) that is excellent in quick processing ability. And among the art (1), a method of using a light-sensitive silver halide color photographic material containing higher concentration of silver chloride (see, for example, KOKAI No. 95345/1983, 19140/1985 and 95736/1983) exhibits excellent quick processability. However, when a light-sensitive silver halide photographic material containing silver halide grains having high concentration of silver chloride is subjected to continuous processing in a single-bath bleach-fixing solution having a pH value of 7.0 - 7.5 or of slightly higher value as in the case of a light-sensitive silver halide color photographic material comprising principally silver bromide, various components in a color developing solution are liable to accumulate in the bleach-fixing solution and hence stain is liable to occur on a processed light-sensitive material (referred to as "BF-stain" hereinafter). Recently, there have progressed a technology of reducing the amount of a replenishing solution for a bleach-fixing solution and a technology of regenerating it in higher percentage from a view point of economy in the processing and reduction in amount of a waste processing solution. As the result, accumulation of various components in a color developing solution, in a bleach-fixing solution, is liable to increase and thus the problems of BF-stain and others have become remarkable. In the present situation, these problems can not be solved only by such technologies as those known to the art, for example, those disclosed in KOKAI No. 136031/1975, and U.S. Patent Nos. 1,131,335 and 3,293,036. Further, according to the method of regeneration or the method of supplying smaller amount of concentrated replenishing solution, the composition of a processing solution may easily be influenced remarkably by evaporation and regenerating operation. The composition may also differ remarkably depending upon the amount of exposed photographic materials to be processed as well as the amount of evaporated processing solution and the amount of the replenishing solution. In particular, the amount of exposed photographic materials in a laboratory differs remarkably between at the beginning of a week when larger amount thereof is ordered to be developed by customers and at a week end when the amount of order decreases; and between at a high-season and at an off-season, the difference of the amounts appearing as a ratio 1 : 5 at the maximum. Under such circumstances, such a photographic performance as fog becomes unstable. Although it can not be said that there has not been any occurrence of BF-stain in a usual light-sensitive photographic material containing silver bromide as a main component, it has been found that this phenomenon becomes a serious problem in the case of a light-sensitive photographic material for the use of quick processing containing silver chloride as a main component. It may be consided that the BF-stain is caused after a color developing agent itself is passed into the bleach-fixing bath and becomes an oxidized form such as a quinonediimine produced by an oxidizing agent such as ethylenediaminetetraacetic acid iron complex (EDTA-Fe) in the bleach-fixing bath and then the oxidized form is reacted in the bleach-fixing bath with a coupler in the light-sensitive color photographic material. Particularly, the BF-stain may remarkably be generated when the sulfite ion concentration in the color developing solution is low. As a result of the present inventor's extensive study to solve the above-mentioned problems, the present inventors have found that the above-mentioned problems can be solved by subjecting a light-sensitive silver halide color photographic material including a silver halide emulsion layer containing at least a certain amount of silver chloride to color development followed by processing in a combined bleach-fixing solution (or bath) having a certain range of pH values, and have accomplished the present invention. Although there may be a problem that there is a possibility of occurrence of leuco dye formation phenomenon when the pH value of a bleach-fixing bath is low, if a light-sensitive silver halide color photographic material including a silver halide emulsion layer containing at least a certain proportion (80 mole % or more) of silver chloride is subjected to color development followed by processing with a bleach-fixing bath having a lower pH value of 4.5 - 6.8, then not only the leuco dye formation does not occur, but also BF-stain is difficult to occur even when various components in a color developing solution are accumulated by the continuous processing in a bleach-fixing bath, because of the rapid development rate of silver chloride. Further, the development rate may further be enhanced by reducing the sulfite ion (SO₃²⁻) concentration according to the above-mentioned art [3]. Furthermore, it was found that, by incorporating the color developing solution with an alkanol amine, the fog caused in the bleach-fixing solution could be suppressed and the generation of fog could be reduced even in the case when smaller amount of a replenishing bleach-fixing solution was supplied. In addition, it was found that the above-mentioned BF-stain may further be reduced by using, as the color developing agent, a p-phenylenediamine series color developing agent, particularly a water-soluble p-phenylenediamine series color developing agent; and that even if BF-stain is caused, less amount of the stain may be visualized in appearance by incorporating the color developing solution with a triazine series fluorescent-brightening agent. Furthermore, it was found that the incorporation of a specific magenta coupler, a specific cyan coupler or a combination thereof in at least one layer of the silver halide emulsion layers in the light-sensitive silver halide color photographic material would enhance the stability during storage of the color developing solution, reduce the BF-stain caused by the bleach-fixing solution and provide an excellent photographic property at the maximum color density. EP-A-0 117 142 discloses a bleach-fixing solution for use in the processing of light-sensitive silver halide color photographic materials which has improved storage stability and improved bleaching speed. The solution uses diethylenetriaminepentaacetic acid as the iron (III) sequestering agent which enables pH values of 4 or higher to be used. EP-A-0 082 649 discloses light-sensitive silver halide color photographic materials which have at least 80 mole % of silver chloride in the blue sensitive layer; such layers can be processed rapidly. The application describes sensitizing dyes and dye combinations which enable such layers to be spectrally sensitised to the desired region of the spectrum. SUMMARY OF THE INVENTION The first object of the present invention is to provide an improved method for processing a light-sensitive silver halide color photographic material in which the light-sensitive silver halide color photographic material uses a silver halide of high silver chloride content to provide a rapid developability and which provides little BF-stain caused by the bleach-fixing step. The second object of the present invention is to provide a method for processing a light-sensitive silver halide color photographic material which provides little fog in a bleach-fixing solution, in particular, even in a bleach-fixing solution which is replenished with a small amount of a replenishing solution. The third object of the present invention is to provide a method of processing a light-sensitive silver halide color photographic material which has improved the processing stability. Other objects of the present invention will be apparent in the hereafter provided description of the processing stability. According to the present invention there is provided a method of processing a light-sensitive silver halide color photographic material in which a light-sensitive silver halide color photographic material having at least one silver halide emulsion layer in which not less than 80 mole % of the total silver halide in the layer is silver chloride is exposed imagewise to light and thereafter subjected to processing including a color development treatment followed by a bleach-fixing treatment, characterised in that said at least one silver halide emulsion layer contains a magenta coupler represented by the formula (M): in which Z represents a group of non-metallic atoms necessary to form a nitrogen-containing heterocyclic ring which may have a substituent, X represents a hydrogen atom, halogen atom or a substituent capable of being released by the reaction with an oxidized form of a color developing agent, and R represents a hydrogen atom or a substituent, and in that the bleach-fixing solution used in said bleach-fixing treatment has a pH in the range of 4.5 to 6.8. DESCRIPTION OF THE PREFERRED EMBODIMENTS. The present invention will be explained below in more detail. The pH value of the bleach-fixing solution employed in the method of the present invention is in the range of 4.5 to 6.8, preferably of 5.0 to 6.3. The adjustment of the pH value of the bleach-fixing solution may be carried out by using, for example, ammonia water, potassium carbonate, sodium carbonate, sodium hydroxide, and potassium hydroxide. While the sulfite ion concentration in the color developing solution used in the method according to the present invention is not critical, it may preferably be not more than 2 x 10⁻² mole/ℓ, more preferably not more than 4 x 10⁻³ mole/ℓ in order to attain quicker processing. As a source for the sulfite ion according to the present invention, there may be mentioned such a sulfite salt as sodium sulfite, potassium sulfite, sodium bisulfite, potassium bisulfite and so on. In the method of the present invention, it may be preferable to incorporate the color developing solution with an alkanol amine represented by the following formula (l): wherein R₁ represents a hydroxyalkyl group having 2 to 6 carbon atoms; R₂ and R₃ each represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a hydroxyalkyl group having 2 to 6 carbon atoms, a benzyl group or a group of (in which n is an integer of 1 to 6, and X and Z each represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or a hydroxyalkyl group having 2 to 6 carbon atoms), in order to prevent also the occurrence of stain caused during the bleach-fixing step when heavy metal ions are included in the color developing solution. The effect of said alkanolamine may remarkably be exhibited particularly when the sulfite ion concentration in the color developing solution is not more than 4 x 10⁻³ mole/ℓ preferable not more than 2 x 10⁻³ mole/ℓ. While it has been known in KOKAI No. 3532/1979 that an alkanolamine is added to a color developing solution for the purpose of inhibiting air oxidation, it is surprising to have found that, even in the case when a light-sensitive material having higher content of silver chloride is processed with a color developing solution having an extremely low concentration of sulfite ion, the use of the compound represented by formula (I) would enable prevention of a color developing agent from becoming unstable due to contamination with such a heavy metal ion as iron and copper ions, namely prevention of bleach-fogging phenomenon caused by the oxidation of the developing agent. Of the compound represented by the above mentioned general formula (I) used in the present invention, the compound represented by the below-mentioned general formula (II) may preferably be employed from the stand point of attaining more effectively the object of the present invention and obtaining more efficiently the effect of the present invention. General formula (II) In the above formula (II), R₄ represents a hydroxyalkyl group having 2 to 4 carbon atoms, R₅ and R₆ each represent an alkyl group having 1 to 4 carbon atoms or a hydroxyalkyl group having 2 to 4 carbon atoms. Preferred specific examples for the compound represented by the above-mentioned formula (I) are as follows: Ethanolamine (I - 1), diethanolamine (I - 2), triethanolamine (I - 3), diisopropanolamine (I - 4), 2-methylaminoethanol (I - 5), 2-ethylaminoethanol (I - 6), 2-dimethylaminoethanol (I - 7), 2-diethylaminoethanol (I - 8), 1-diethylamino-2-propanol (I - 9), 3-diethylamino-1-propanol (I - 10), 3-dimethylamino-1-propanol (I - 11), isopropylaminoethanol (I - 12), 3-amino-1-propanol (I - 13), 2-amino-2-methyl-1,3-propanediol (I - 14), ethylenediaminetetraisopropanol (I - 15), benzylethanolamine (I - 16), 2-amino-2-(hydroxymethyl)-1,3-propanediol (I - 17). The compound represented by the above-mentioned general formula (I) may preferably be employed in an amount ranging from 3 to 100 g, more preferably from 6 to 50 g per one litre of the color developing solution, from the standpoint of attaining the object and obtaining the effect of the present invention. As the color developing agent used in the color developing solution according to the present invention, there may preferably be used a p-phenylenediamine series compound having a water-soluble group, from the standpoint of attaining the object and obtaining the effect of the present invention. The p-phenylenediamine series compound having a water-soluble group does not cause less stain on a light-sensitive material and less damage to human skin, thus showing an adnantage over a p-phenylenediamine series compound having no water-soluble group such as N,N-diethyl-p-phenylenediamine. In addition, the p-phenylenediamine series compound operates more efficiently when combined with the compound of the above-mentioned formula (I). As the p-phenylenediamine series compound having a water-soluble group, there may be mentioned those having at least one water-soluble group on the amino group or the benzene nucleus of the p-phenylenediamine series compound. Preferred specific water-soluble groups are as follows: -(CH₂) n -CH₂OH; -(CH₂) m -NHSO₂-(CH₂) n -CH₃; -(CH₂) m -O- (CH₂) n -CH₃; -(CH₂CH₂O) n -C m H 2m+1 (wherein m and n each represent an integer of not less than zero); -COOH; and -SO₃H. Examplified color developing agents, which may be preferred in the present invention, are shown as follows: Of the color developing agents as exemplified above, more preferable compounds are Exemplified compounds Nos. (A - 1), (A - 2), (A - 3), (A - 4), (A - 6), (A - 7) and (A - 15), with the especially preferred compound being (A - 1). The above-mentioned color developing agent may usually be employed in the form of a salt such as hydrochloride, sulfate and p-toluenesulfonate. The color developing agent having a water-soluble group as used in the present invention may preferably be employed in an amount of 1 x 10⁻² to 2 x 10⁻¹ mole per one litre of the color developing solution, more preferably 1.5 x 10⁻² to 2 x 10⁻¹ mole per one litre of the color developing solution from the standpoint of quick processing. In the present invention, the object of the present invention may effectively be attained by using a triazylstylbene series fluorescent-brightening agent represented by the below-mentioned general formula (III) in the color developing solution. General formula (III): wherein X₁, X₂, Y₁ and Y₂ each represent a hydroxyl group, a halogen atom such as chlorine and bromine, a morpholino group, an alkoxy group (e.g., methoxy, ethoxy, methoxyethoxy), an aryloxy group (e.g., phenoxy, p-sulfophenoxy), an alkyl group (e.g., methyl, ethyl), an aryl group (e.g., phenyl, methoxyphenyl), an amino group, an alkyl amino group (e.g., methylamino, ehtylamino, propylamino, dimethylamino, cyclohexylamino, β-hydroxyethylamino, di(β-hydroxyethyl)amino, β-sulfoethylamino, N-(β-sulfoethyl)-N'-methylamino, N-(β-hydroxyethyl)-N'-methylamino) or an arylamino group (e.g., anilino; o-, m-, p-chloroanilino; o-, m-toluidino; o-, m-, p-carboxyanilino; o-, m-, p-hydroxyanilino; sulfonaphthylamino; o-, m-, p-aminoanilino; o-, m-, p-anidino); M represents a hydrogen atom, a sodium atom, a potassium atom, ammonium or a lithium atom. More specifically, there may be mentioned the following compounds, which however should not be construed to limit the present invention. The triazylstylbene series fluorescent-brightening agent according to the present invention may be synthesized by the conventional method as described in, for example, "Fluorescent-brightening agents", page 8 edited by KASEIHIN-KOGYO-KYOKAI (Chemical Product Industries Association, Japan) and published in August, 1976. The triazylstylbene series fluorescent-brightening agent may preferably be employed in an amount rarging from 0.2 to 6 g, more preferably 0.4 to 3 g per one litre of the color developing agent used in the present invention. In the color developing agent, there may be incorporated the following additives. As an alkali agent other than the above-mentioned carbonate salt, there may be used, for example, sodium hydroxide, potassium hydroxide, silicate salts, sodium metaborate, potassium metaborate, trisodium phosphate, tripotassium phosphate and borax alone or in combination, in an amount of a range which does not cause precipitation and which maintains the pH-stabilizing effect. Further, for the purpose of effective formulation of the color developing solution and of enhancing the ionic strength therein, there may be used various salts such as disodium phosphate, dipotassium phosphate, sodium bicarbonate and a borate salt. In addition, an inorganic or organic antifogging agent may be added as occasion demands. If necessary, a development accelerator may also be used. The development accelerator includes various pyridinium compounds described in for example, U.S. Patent Nos. 2,648,604 and 3,671,247, and KOKOKU No. 9503/1969; other cationic compounds; a cationic dye such as phenosafranine; a neutral salt such as thallium nitrate; a nonionic compound such as polyethylene glycol, its derivatives and polythioethers disclosed in U.S. Patent Nos. 2,533,990, 2,531,832, 2,950,970 and 2,577,127, and KOKOKU No. 9504/1969; organic solvent and organic amines as described in KOKOKU No. 9509/1969; ethanolamine; ethylenediamine; diethyleneamine and triethanolamine. Further, there may be mentioned benzyl alcohol and phenethyl alcohol as disclosed in U.S. Patent No. 2,304,925, and additionally acetylene glycol, methyl ethyl ketone, cyclohexanone, thioethers, pyridine, ammonia, hydrazine and amines. In cases when a poorly soluble organic solvent represented by benzyl alcohol is used, tar is liable to be caused in the running treatment adopting a system in which a small amount of replenisher is supplied, due to the use of a color developing solution for a long peried of time. The thus formed tar sticks to a processed paper light-sensitive material and damages its commercial value, thus causing a serious problem. Further, a poorly soluble organic solvent requires troublesome procedure, such as the use of a stirring device, when a color developing solution itself is prepared. Even if such a stirring device is used, its development accelerating effect is limited due to its low solubility. Furthermore, a poorly soluble organic solvent exhibits a large pollution loading value, such as biochemical oxygen demand (BOD), and it is not permitted to discharge it into sewerage and river. Treatment of waste water has a problem that it requires great deal of labour and cost. Therefor, preferably, the amount of a poorly soluble organic solvent to be used should be reduced to the utmost or it should not be used. In cases where at least one compound selected from the compounds represented by the below mentioned general formula (B - I) or (B - II) is incorporated in the color developing agent used in the present invention, the object of the present invention may better be attained and the effect of the present invention may advantageously be obtained; and, even in case when an organic iron complex (for example, ethylenediaminetetraacetic acid iron (III) complex) in a bleach-fixing bath is admixed inadvertently in the color developing solution at the time when a lack of an automatic develpment machine is handled, the color developing solution remains stabilized. Accordigly, the compound of formula (B - I) or (B - II) is preferred. General formula (B - I): Gerenal formula (B - II): In formula (B - I) and (B - II), R₁, R₂, R₃, and R₄ each represent a hydrogen atom, a halogen atom, a sulfonic acid group, an alkyl group having 1 to 7 carbon atoms, -OR₅, -COOR₆, or a phenyl group. Further, R₅, R₆, R₇, and R₈ each represent a hydrogen atom or an alkyl group having 1 to 18 carbon atoms. Provided that, when R₂ represents -OH or a hydrogen atom, R₁ represents a halogen atom, a sulfonic acid group, an alkyl group having 1 to 7 carbon atoms, -OR₅, -COOR₆, or a phenyl group. As the alkyl group represented by R₁, R₂, R₃ and R₄, there may be mentioned, for example, a methyl group, an ethyl group, an isopropyl group, an n-propyl group, a t-butyl group, a hydroxymethyl group, a hydroxyethyl group, a methylcarboxylic acid group and a benzyl group. The alkyl group represented by R₅, R₆, R₇, and R₈ has the same meaning as in the alove and may further include an octyl group. The phenyl group represented by R₁, R₂, R₃, and R₄ includes a phenyl group, a 2-hydroxyphenyl group and a 4-aminophenyl group. Representative specific examples of the chelating agent as used in the present invention will be listed below, which should not however be construed to limit the present invention. (B-I-1) 4-Isopropyl-1,2-dihydroxybenzene (B-I-2) 1,2-Dihydroxybenzene-3,5-disulfonic acid (B-I-3) 1,2,3-Trihydroxylbenzene-5-carboxylic acid (B-I-4) 1,2,3-Trihydroxybenzene-5-carboxymethyl ester (B-I-5) 1,2,3-Trihydroxybenzene-5-carboxy-n-butyl ester (B-I-6) 5-t-Butyl-1,2,3-trihydroxybenzene (B-II-1) 2,3-Dihydroxynaphthalene-6-sulfonic acid (B-II-2) 2,3,8-Trihydroxynaphthalene-6-sulfonic acid (B-II-3) 2,3-Dihydroxynaphthalene-6-carboxylic acid (B-II-4) 2,3-Dihydroxy-8-isopropylnaphthalene (B-II-5) 2,3-Dihydroxy-8-chloronaphthalene-6-sulfonic acid Of the above-enumerated compound, which may particularly preferably be employed in the present invention is 1,2-dihydroxybenzene-3,5-disulfonic acid which may also be used in the form of an alkali metal salt such as a sodium salt on a potassium salt. In the present invention, the compound represented by formula (B - I) or (B - II) may typically be used in an amount of 5 mg to 20 g, preferably 10 mg to 10 g, more preferably 20 mg to 3 g per one litre of the color developing solution, thus giving a satisfactory result. The compound of formula (B - I) or (B - II) may be used alone or in combination, or it may be used in combination with other chelating agents such as an aminopolyphosphonic acid, e.g., aminotri (methylene-phosphonic acid) and ethylenediaminetetraphophoric acid; an oxycarboxylic acid such as citric acid and gluconic acid; a phosphonocarboxylic acid such as 2-phosphonobutane-1,2,4-tricarboxylic acid; a polyphosphoric acid such as tripolyphosphoric acid and hexamethaphosphoric acid. In the color developing solution used in the present invention, there may be used, as occasion demands, ethylene glycol, methyl cellosolve, methanol, acetone, dimethylformamide, β-cyclodextrin and other compounds described in KOKOKU Nos. 33378/1972 and 9505/1969 as organic solvents which enhance the solubility of the developing agent. Moreover, an auxiliary developing agent may also be employed in combination with the developing agent. As the auxiliary developing agent, there have been known, for example, N-methyl-p-aminophenol hemisulfate (Metol), phenidone, N,N'-diethyl-p-aminophenol hydrochloride and N,N,N',N'-tetramethyl-p-phenylenediamine hydrochloride, which may preferably be added in an amount of 0.01 to 1.0 g/ℓ. In addition, there may further be added, as occasion demands, a competitive coupler, a fogging agent, a colored coupler, a development-inhibitor-releasing coupler (so-called DIR coupler) or a development-inhibitor-releasing compound. Further, various additives such as other anti-staining agent than those mentioned above, an interlayer effect enhancing agent and so on may also be employed. The color developing solution may be prepared by adding successively the above-mentioned various components to a predetermined amount of water followed by stirring. In this case, a component having poorer solubility in water may be added after mixed with the above-mentioned organic solvent such as triethanolamine and the like. In general, the color developing agent may be obtained by adding to water each component which has preliminarily been formulated, together with other compatible components, into a concentrated aqueous solution or a solid contained in a small vessel, followed by stirring. In the present invention, the color developing solution may be used in optional pH range. However, the pH thereof may preferably be in the range of 9.5 to 13.0, more preferably 9.8 to 13.0, from the viewpoint of quick processing. In the present invention, typical processing temperature for color development is not lower than 30 o C and not higher than 50 o C. While higher temperature may be preferred on one hand since the higher the temperature is, the shorter the time required for processing is, not so higher temperature may be preferred on the other hand, from the viewpoint of the stability of an image during storage. The temperature between 33 and 45 o C may be preferred for processing. It has been said that the development period of time is generally around 3 minutes and 30 seconds. In the present invention, however, it is enabled to carry out the development processing within 2 minutes, even in 30 seconds to 1 minutes and 30 seconds. The bleaching agent, which may preferably be used in the bleach-fixing solution according to the present invention, is a metal complex of an organic acid. The complex includes those in which a metal ion such as a iron, cobalt and copper ions has coordinated with an organic acid such as an aminopolycarboxylic acid, oxalic acid and citric acid. As the most preferred organic acid to be used for forming such a metal complex of an organic acid, there may be mentioned a polycarboxylic acid. The polycarboxylic acid or the aminopolycarboxylic acid may be in the form of an alkali metal salt, an ammonium salt or a water-soluble amine salt. Specific compounds therefor may includes the following. 1. Ethylenediaminetetraacetic acid 2. Diethylenetriaminepentaacetic acid 3. Ethylenediamine-N-(β-oxyethyl)-N,N',N'-triacetic acid 4. Propylenediaminetetraacetic acid 5. Nitrilotriacetic acid 6. Cyclohexanediaminetetraacetic acid 7. Iminodiacetic acid 8. Hydroxyethylglycinecitric acid 9. Ethyl-ether-diaminetetraacetic acid 10. Glycol-ether-diaminetetraacetic acid 11. Ethylenediaminetetrapropionic acid 12. Phenylenediaminetetraacetic acid 13. Ethylenediaminetetraacetic acid disodium salt 14. Ethylenediaminetetraacetic acid tetra(trimethylammonium) salt 15. Ethylenediaminetetraacetic acod tetraspdoi, salt 16. Diethylenetriaminepentaacetic acid pentasodium salt 17. Ethylenediamine-N-(β-oxyethyl)-N,N',N'-triacetic acid sodium salt 18. Propylenediaminetetraacetic acid sodium salt 19. Nitriloacetic acid sodium salt 20. Cyclohexanediaminetetraacetic acid sodium salt These bleaching agent may preferably be employed in an amount of 5 to 450 g/ℓ, more preferably 20 to 250 g/ℓ, most preferably 25 to 100 g/ℓ. The bleach-fixing solution according to the present invention may contain, in addition to the bleaching agent as mentioned above, a silver halide fixing agent and optionally a sulfite salt as a preservative. There may also be employed a bleach-fixing solution containing a small amount of a halogenide compound such as ammonium bromide in addition to a bleaching agent comprising an iron (III) complex salt of ethylenediaminetetraacetic acid and the above-mentioned silver halide fixing agent; a bleach-fixing solution incorporated, in contrast to the above, with a large amount of a halogenide compound such as ammonium bromide; a special bleach-fixing solution containing a combination of a bleaching agent comprising an iron (III) complex salt of ethylenediaminetetraacetic acid and a large amount of a halogenide compound such as ammoniunm bromide. The above-mentioned halogenide compound includes, in addition to ammonium bromide, hydrochloric acid, hydrobromic acid, lithium bromide, sodium bromide, potassium bromide, sodium iodide, potassium iodide and ammonium iodide. As the above-mentioned silver halide fixing agent contained in the bleach-fixing solution, there may be mentioned a compound capable of reacting with such a silver halide as used in an ordinary bleach-fixing processing to form a water-soluble complex salt, the representative of which may include, for example, a thiosulfate salt such as potassium thiosulfate, sodium thiosulfate and ammonium thiosulfate; a thiocyanate salt such as potassium thiocyanate, sodium thiocyanate and ammonium thiocyanate; a thiourea; and a thioether. These fixing agents may be used in an amount of not less than 5 g/ℓ, a range which may be dissolved completely, generally of 70 to 250 g/ℓ. To the bleach-fixing solution, there may be added, alone or in combination, various pH buffering agents such as boric acid, borax, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, acetic acid, sodium acetate and ammonium hydroxide. Furthermore, the bleach-fixing solution may also be incorporated with various fluoresent-brightening agents, anti-foaming agents or surface active agents. Further, it may optionally be incorporated with a preservative such as hydroxylamine, hydrazine and a bisulfite adduct of an aldehyde compound; san organic chelating agent such as an aminopolycarboxylic acid; a stabilizing agent such as a nitroalcohol and a nitrate salt; an organic solvent such as methanol, dimethylsulfonamide and dimethylsulfoxide. To the bleach-fixing solution used in the present invention, there may be added various kinds of bleaching accelerators as described in KOKAI No. 280/1971, KOKOKU Nos. 8506/1970 and 556/1971, Belgian Patent No. 770,910, KOKOKU Nos. 8836/1970 and 9854/1978, and KOKAI Nos. 71634/1979 and 42349/1974. The bleach-fixing solution is used at a temperature of not higher than 80 o C, which is lower than that of the color developing bath by 3 o C or more, preferably by 5 o C or more, with the preferred temperature being not higher than 55 o C to suppress evaporation. In the light-sensitive silver halide color photographic material applied to the method according to the present invention, the silver halide in at least one layer of silver halide emulsion layers contains not less than 80 mole %, preferably not less than 90 %, more preferably not less than 95 mole % of silver chloride. The above-mentioned silver halide emulsion including silver halide grains which contain 80 mole % or more of silver chloride may contain, as a silver halide component, silver bromide and/or silver iodide in addition to silver chloride. In such a case the amount of silver bromide may typically be not more than 20 mole %, preferably not more than 10 mole %, more preferably not more than 5 mole %. If silver iodide exists, the amount thereof may be not more than 1 mole %, more preferably 0.5 mole % or less. The photographic material used in the method of the present invention, is one which contains, in at least one silver halide emulsion layer, in which not less than 80 mol % of the total silver halide in the layer is silver chloride a magenta coupler represented by the following formula (M) wherein Z represents a group of non-metallic atoms necessary for forming a nitrogen-containing heterocyclic ring which may be unsubstituted or substituted; X represents a group capable of being released by the reaction with an oxidized product of a color developing agent; and R represents a hydrogen atom or a substituent. The magenta dye as mentioned above can provide the light-sensitive silver halide color photographic material containing the same therein with an excellent effect particularly when a lower concentration (not more than 2 x 10⁻² mole/ℓ, preferably not more than 4 x 10⁻³ mole/ℓ) of sulfite ions is contained in the color developing solution. While R in formula (M) represents a hydrogen atom or a substituent, as the substitutent represented by R in formula (M), there may be mentioned, for example, a halogen atom, an alkyl group, a cycloalkyl group, an alkenyl group, a cycloalkenyl group, an alkynyl group, an aryl group, a heterocyclic group, an acyl group, a sulfonyl group, a sulfinyl group, a phosphonyl group, a carbamoyl group, a sulfamoyl group, a cyano group, a spiro compound residual group, a bridged hydrocarbon compound residual group, an alkoxy group, an aryloxy group, a heterocyclyloxy group, a siloxy group, an acyloxy group, a carbamoyloxy group, an amino group, an acylamino group, a sulfonamide group, an imide group, an ureido group, a sulfamoylamino group, an alkoxycarbonylamino group, an aryloxycarbonylamino group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkylthio group, an arylthio group and a heterocyclicthio group. As halogen atoms, for example, chlorine atom, bromine atom may be used, particularly preferably chlorine atom. The substituent eliminable through the reaction with the oxidized product of a color developing agent represented by X may include groups substituted through a carbon atom, an oxygen atom, a sulfur atom or a nitrogen atom. The halogen atom represented by X may include a chlorine atom, a fluorine atom or a bromine atom. The nitrogen-containing heterocyclic ring formed by Z may include a pyrazole ring, a imidazole ring, a triazole ring or a tetrazole ring, and the substituents which may be possessed by the above rings may include those as mentioned for the above R. When the substituent (e.g. R, R₁ to R₈) on the hetero- cyclic ring in the formula (M) and the formulae (M1) to (M6) as hereinafter described has a moiety of the formula: (wherein R'', X and Z'' have the same meanings as R, X and Z in the formula (M)), the so-called bis-form type coupler is formed, which is of course included in the present invention. The ring formed by Z, Z'' and Z₁ as hereinafter described may also be fused with another ring (e.g. a 5- to 7-membered cycloalkene). For example, R₅ and R₆ in the formula (M4), R₇ and R₈ in the formula (M5) may be bonded to each other to form a ring (e.g. a 5- to 7-membered rings). The compounds represented by the formula (M) can be also represented specifically by the following formulae (M1) through (M6). In the above formulae (M1) to (M6), R₁ to R₈ and X have the same meanings as the above R and X. Of the compounds represented by the formula (M), those represented by the following formula (M7) are preferred. wherein R₁, X and Z₁ have, the same meanings as R, X and Z in the formula (M). Of the magenta couplers represented by the formulae (M1) to (M6), the magenta coupler represented by the formula (M1) is particularly preferred. To describe about the substituents on the heterocyclic ring in the formulae (M) and (M1) to (M7), R in the formula (M) and R₁ in the formulae (M1) to (M7) should preferably satisfy the following condition 1, more preferably satisfy the following conditions 1 and 2, and particularly preferably satisfy the following conditions 1, 2 and 3: Condition 1: a root atom directly bonded to the heterocyclic ring is a carbon atom, Condition 2: only one of hydrogen atom is bonded to said carbon atom or no hydrogen atom is bonded to it, and Condition 3: the bondings between the root atom and adjacent atoms are all single bonds. Of the substituents R and R₁ on the above heterocyclic ring, most preferred are those represented by the formula (M8) shown below: In the above formula, each of R₉, R₁₀ and R₁₁ represents a hydrogen atom, a halogen atom, an alkyl group, a cycloalkyl group, an alkenyl group, a cycloalkenyl group, an alkynyl group, an aryl group, a heterocyclic group, an acyl group, a sulfonyl group, a sulfinyl group, a phosphonyl group, a carbamoyl group, a sulfamoyl group, a cyano group, a spiro compound residual group, a bridged hydrocarbon compound residual group, an alkoxy group, an aryloxy group, a heterocyclicoxy group, a siloxy group, an acyloxy group, a carbamoyloxy group, an amino group, an acylamino group, a sulfonamide group, an imide group, an ureido group, a sulfamoylamino group, an alkoxycarbonylamino group, an aryloxycarbonylamino group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkylthio group, an arylthio group or a heterocyclicthio group. Also, at least two of said R₉, R₁₀ and R₁₁, for example, R₉ and R₁₀ may be bonded together to form a saturated or unsaturated ring (e.g. cycloalkane ring, cycloalkene ring or heterocyclic ring), and further to form a bridged hydrocarbon compound residual group by bonding R₁₁ to said ring. The groups represented by R₉ to R₁₁ may have substituents, and examples of the groups represented by R₉ to R₁₁ and the substituents which may be possessed by said groups may include examples of the substituents which may be possessed by the R in the above formula (M), and substituents which may be possessed by said substituents. Also, examples of the ring formed by bonding between R₉ and R₁₀, the bridged hydrocarbon compound residual group formed by R₉ to R₁₁ and the substituents which may be possesed thereby may include examples of cycloalkyl, cycloalkenyl and heterocyclic groups as mentioned for substituents on the R in the aforesaid formula (M) and substituents thereof. Of the groups of the formula (M8), preferred are: (i) the case where two of R₉ to R₁₁ are alkyl groups; and (ii) the case where one of R₉ to R₁₁, for example, R₁₁ is a hydrogen atom and two of the other R₉ and R₁₀ are bonded together with the root carbon atom to form a cycloalkyl group. Further, preferred in (i) is the case where two of R₉ to R₁₁ are alkyl groups and the other one is a hydrogen atom or an alkyl group. Here, said alkyl and said cycloalkyl may further have substituents, and examples of said alkyl, said cycloalkyl and subsituents thereof may include those of alkyl, cycloalkyl and substituents thereof as mentioned for the substituents on the R in the formula (M) and the substituents thereof. The magenta coupler represented by formula (M) may include the specific compound enumerated below. The above couplers were synthesized by referring to Journal of the Chemical Society, Perkin I (1977), pp. 2047 - 2052, U.S. Patent No. 3,725,067, KOKAI Nos. 99437/1984 and 42045/1984. The coupler used in the invention can be used in an amount generally within the range of from 1 x 10⁻³ mole to 1 mole, preferably from 1 x 10⁻² to 8 x 10⁻¹ mole, per mole of the silver halide. Example 1. On a polyethylene-laminated paper support, there was coated each of the following layers successively in the order of numbered layers viewed from the side of the support. Layer 1: a layer containing 1.3 g/m² of gelatin, 0.37 g/m² (calculated in terms of silver, the same applies hereinafter) of a blue-sensitive silver chlorobromide emulsion (containing 96 mole % of AgCℓ) and 1.0 x 10⁻³ mole/m² of above-mentioned yellow coupler (Y - 1) dissolved in 0.50 g/m² of dioctyl phthalate. Layer 2: an intermediate layer consisting of 0.56 g/m² of gelatin. Layer 3: a layer containing 1.58 g/m² of gelatin, 0.26 g/m² of a green-sensitive silver chlorobromide emulsion (containing 98 mole % of AgCℓ) and 1.1 x 10⁻³ mole/m² of above-mentioned magenta coupler (M - 1) dissolved in 0.36 g/m² of dioctyl phthalate. Layer 4: an intermediate layer consisting of 1.5 g/m² of gelatin. Layer 5: a layer containing 1.3 g/m² of gelatin, 0.26 g/m² of a red-sensitive silver chlorobromide emulsion (containing 98 mole % of AgCℓ) and 1.4 x 10⁻³ mole/m2 of above-mentioned cyan coupler (C - 1) dissolved in 0.20 g/m² of dibutyl phthalate. Layer 6: a layer containing 1.0 g/m² of gelatin and 0.34 g/m² of Tinuvin 328 (a ultraviolet absorber manufactured by Ciba-Geigy AG) dissolved in 0.220 g/m² of dioctyl phthalate. Layer 7: a layer containing 0.48 g/m² of gelatin. Further, there was added 2,4-dichloro-6-hydroxy-s-triazine sodium as a film-hardener to Layers 2, 4 and 7 so that the amount thereof in each Layer may be 0.012 g per one gramm of gelatin. Comparative color papers were prepared in the manner as mentioned above. Similarly, samples for experiments including samples according to the present invention and comparative samples were prepared and used by replacing magenta coupler (M - 1) with the magenta couplers as shown in Table 5. Next, these samples were wedge-exposed to light according to a conventional method and then subjected to development treatment as follows: Processing step Processing temperature Processing time (1) Color development 35 o C 45 seconds (1) Bleach-fixing 35 o C 45 seconds (3) Water-washing 30 o C 100 seconds (4) Drying 60 - 80 o C 90 seconds The color developing solution and the bleach-fixing solution employed had the following compositions, respectively. (Color developing solution) o Potassium chloride 2.0 g o Potassium sulfite described in Table 5 o Sodium polyphosphate 2.0 g o Color developing agent (Exemplified compound A - 1) 5.6 g o Potassium carbonate 30 g Water was added to make up the solution to 1 ℓ and the solution was adjusted to pH 10.15 by using potassium hydroxide and a 50 % sulfuric acid. (Bleach-fixing solution) Ethylenediaminetetraacetic acid iron (III) ammonium dihydrate 60.0 g Ethylenediaminetetraacetic acid 3.0 g Ammonium thiosulfate (70 % solution) 100.0 mℓ Ammonium sulfite (40 % solution) 27.5 mℓ Water was added to make up the total volume to 1 ℓ and adjusted to pH as described in Table 5 by using potassium carbonate or glacial acetic acid. Be noted however that Fe³⁺ and Cu²⁺ was added to said bleach-fixing solution in amounts of 3 ppm and 1.5 ppm, respectively, and the so obtained bleach-fixing solution was mixed with 250 mℓ of said color developing solution and the mixture was stored for 3 days at 45 o C followed by development treatment. Samples after development treatment were measured with respect to the magenta density at the unexposed portion of which a fog would be problematic due to the high coupling speed and the yellow density at the maximum density portion of which color density is hard to appear due to the slow development speed, by using a Sakura Photoelectric Densitometer PDA - 65 (manufactured by Konishiroku Photo Industry Co., Ltd.). As is apparent from Table 5, it can be understood that, in cases where the concentration of sulfite irons in the color developing solution is in the range of not more than 4 x 10⁻³ mole/ℓ, the color developing solution contains the compound of the above-mentioned general formula (I) according to the present invention and the pH value of tile bleach-fixing solution is in the range of 4.5 to 6.8, sufficient yellow dye density can be obtained despite the extremely short period of time for color development of 45 seconds and generation of magenta stain at the unexposed portion is little. However, in cases where the sulfite ion concentration in the color developing solution the existence or non-existence of the magenta coupler of the above-mentioned general formula (M) according to the present invention the pH value in the bleach-fixing solution are outside the scope of the present invention, yellow dye density is insufficient, large amounts of magenta stains occur and the commercial value of the product is decreased. Example 2. Experiments were run in the same manner as in Example 1 except that the color developing agent (A - 1) in the color developing solution employed in Example 1 was replaced by above-mentioned (B - 1) or (B - 2). As the result, magenta stains at the unexposed portion worsened by 0.02 in each case. Similarly, experiments were conducted in the same manner as in Example 1 except that the color developing agent (A - 1) in Example 1 was replaced by Exemplified compound (A - 2), (A - 4) arid (A - 15), respectively. As the result, almost the same result as in Example 1 was obtained. Example 3. Experiments were run in the same manner as in Example 1 except that the silver halide composition of the blue-sensitive layer in the light-sensitive silver halide color photographic material employed in Experiment No. 6 of Example 1 was changed to those in below-mentioned Table 6, respectively. The results are summarized in Table 6. Example No. Silver halide composition Yellow density at the portion of the highest density AgBr(mole %) AgCℓ(mole %) 21 100 0 1.13 22 75 25 1.40 23 50 50 1.68 24 30 70 1.83 25 20 80 2.24 26 10 90 2.40 27 5 95 2.54 28 3 97 2.61 29 0 100 2.64 As is apparent from Table 6, it can be understood that yellow dye density is sufficient when the silver halide composition in the light-sensitive color phtographic material contains not less than 80 mole % of silver chloride, while a lower silver chloride content than 80 mole % will not bring about sufficient color density. Further, it can be understood that better color density is obtained in cases where the silver halide contains 90 mole % or more and especially good color density will be obtained in cases where the silver halide contains more than 95 mole % of silver chloride. When the silver halide composition in the red-sensitive layer or the green-sensitive layer was varied in the same way as in the abo ve, similar results were obtained with respect to the cyan color density and the magenta color density. In particular, in cases where the silver chloride content in all the silver halide emulsion layers is not less than 80 mole %, particularly not less than 90 mole % and especially not less than 95 mole %, it was found that all the layers give satisfactory color density to provide complete blackness. Example 4. Experiments were run in the same manner as in Example 1 except that there was added each of Exemplified compounds (A' - 2), (A' - 4) and (A' - 9) (all the compounds are triazylstylbene series fluorescent-brightening agents) in an amount of 2 g/ℓ, respectively to the color developing solution used in Example 1. As the result, occurrence of magenta stains was improved by 0.01 to 0.02, i.e., by 20 % to 40 %. Example 5. Experiments were run in the same manner as in Example 1 except that the color developing solution used in Experiment No. 6 of Example 1 was incorporated with 0.5 g/ℓ of Exemplified compound (B - I - 2), (B - I - 3) and (B - II - 3). As the result, the magenta stain density was reduced by 0.01 to 0.02 and thus improved. Example 6. Experiments were run in the same manner as in Example 1 except that the color developing solution used in Experiment No. 6 of Example 1 was incorporated with 12 g/ℓ of Exemplified compound (I - 3) or (I - 7), respectively. As the result, the color density of the color developing solution was improved and the magenta stain was reduced further by 0.01. Example 7. Experiments were run in the same manner as in Example 1 except that the Exemplified coupler (M - 5) used in Experiment No. 6 of Example 1 was replaced by (M - 7), (M - 22), (M - 104), (M - 152), (M - 171) or (M - 1), respectively. As the results, almost the same results as in Example 1 were obtained.

Claims: A method of processing a light-sensitive silver halide color photographic material in which said material having at least one silver halide emulsion layer in which not less than 80 mole % of the total silver halide in the layer is silver chloride is exposed imagewise to light and thereafter subjected to processing including a color development treatment followed by a bleach-fixing treatment, characterised in that said at least one silver halide emulsion layer contains a magenta coupler represented by the formula (M): in which Z represents a group of non-metallic atoms necessary to form a nitrogen-containing heterocyclic ring which may have a substituent, X represents a hydrogen atom, halogen atom or a substituent capable of being released by the reaction with an oxidized form of a color developing agent, and R represents a hydrogen atom or a substituent, and in that the bleach-fixing solution used in said bleach-fixing treatment has a pH in the range of 4.5 to 6.8. The method according to claim 1, characterised in that the sulfite ion concentration in the color developing solution used in said color developing treatment is not more than 2 X 10⁻² moles per litre. The method according to claim 2, characterised in that the sulfite ion concentration in the color developing solution used in said color developing treatment is not more than 4 X 10⁻³ moles per litre. The method according to any of the preceding claims, characterised in that the color developing solution used in said color developing treatment contains an alkanolamine represented by the formula (I): in which R¹ represents a hydroxyalkyl group having 2 to 6 carbon atoms, R² and R³ each represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a hydroxyalkyl group having 2 to 6 carbon atoms, a benzyl group or a group in which n is an integer of 1 to 6 and X and Y each represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or a hydroxyalkyl group having 2 to 6 carbon atoms. The method according to any of the preceding claims, characterised in that the color developing agent in the color developing solution used in said color developing treatment is a p-phenylenediamine series color developing agent having at least one substituent group which renders the p-phenylaminediamine water-soluble. The method according to claim 5, characterised in th said water soluble group is one of the groups -(CH₂) n CH₂OH, -(CH₂) m -NHSO₂-(CH₂) n -CH₃, -(CH₂) m -O-(CH₂) n -CH₃, -(CH₂CH₂O) n -C m H 2m+1 , in which n and m each represent an integer; -COOH; and -SO₃H. The method according to any of the preceding claims, characterised in that the color developing solution used in the color developing treatment contains a triazine series fluorescent brightening agent represented by the formula: in which X₁, X₂, Y₁ and Y₂ each represent a hydroxyl group, a halogen atom, a morpholino group, an alkoxy group, an aryloxy group, an aryl group, an amino group, an alkyl amino group or an arylamino group, and M represents a hydrogen atom, a sodium atom, a potassium atom, an ammonium group or a lithium atom.

Inventors: KOBOSHI SHIGEHARU, KUSE SATORU, KOBOSHI, SHIGEHARU, KUSE, SATORU
Applicants: KONISHIROKU PHOTO IND, KONICA CORPORATION
Application year: 1987
Main classification: G03C7
IPC codes: G03C7