METHOD OF PRODUCTION OF BROMINE-IODINE-SILVER AMMONIA PHOTOGRAPHIC EMULSION Russian patent published in 1997 - IPC

FIELD: production of black-and- white photographic materials for aerial photography. SUBSTANCE: production of bromine-iodine-silver ammonia photographic emulsion with a size of microcrystals of silver halide within 0.2 to 0.5 mcm by two-jet emulsification at pB_r equal to 3+-0.2, physical ageing, solid phase precipitation by sulfopolystyrene, dispersion, bringing-up of the pH-values to 6-6.3 and pB_r to 3+-0.1, chemical ageing in the presence of sodium thiosulfate, benzosulfinoacidic sodium and aurichlorohydric acid, introduction in emulsion, of 5-methyl-7-oxy-1,3,4-triazaindolicine, introduction of soda solution up to a pH-value of 0.8 to 8.5, introduction in emulsion at a temperature of 31 to 41 C of stabilizers of tritolylphosphine and 2-H-heptyl-5-methyl-6- bromine-7-oxy-1,3,4 triazaindolicine, N-phenyl- N-(1,3,5-triazaadamantine-7)-thiourea and sensing dyes. EFFECT: facilitated procedure. 1 tbl