METHOD FOR MANUFACTURING OF HALOGEN-SILVER PHOTOGRAPHIC EMULSIONS FOR BLUE SENSITIVE LAYER OF COLORED FILM- AND PHOTOGRAPHIC MATERIALS Russian patent published in 1997 - IPC

FIELD: production of colored film- and photographic materials. SUBSTANCE: method involves emulsification, chemical ageing and adding 5-methyl-7-oxy-1,3,4-trizaindolicine and derivative of anilide of benzoyl acetic acid. Said emulsification is carried out by adding of silver compound into aqueous gelatine solution, solution of ammonia to concentration 0.1-1.0 M is additionally added into it. Silver nitrate is used as said silver compound. Simultaneously with mentioned above silver compound equimolar solution of ammonium bromide or mixture of ammonium bromide with potassium iodide are added, the process takes place till concentration of silver iodide in mentioned above emulsion is 0.1-1.0 mol % of total content of silver halides. At emulsification stage pBr is maintained within 1.0-4.0 ranges, temperature is maintained within 25-50 C ranges. Average size of emulsion microcrystals is adjusted to 0.4-0.7 μ. During mentioned above chemical ageing aurum chloride is used as said aurum compound, solution of sodium thiosulfate and solution of sodium salt of isobutylbenzene thiosulfoacid or solution of sodium benzenesulfinate or solution of 2-methylmercapto-5-methyl-7-oxy-1,3,4-triazaindolicine or mixture thereof being added. EFFECT: decreased deposition of silver, improved colored characteristics.