METHOD OF CHEMICALLY SENSITIZING PHOTOGRAPHIC BROMID-IODIDE EMULSIONS Russian patent published in 1994 - IPC

FIELD: producing cine- and photomaterials. SUBSTANCE: method of chemically sensitizing photographic silver bromid-iodide emulsions so as to increase photosensitivity with maintaining fog density constant involves the steps of: introducing sodium thiosulfate, sodiumbenzenesulfite into them with pBr 2.5 - 3.5 and pH of 6 - 7, keeping for 40 - 50 min, introducing chloroauric acid (A) and in 1-20 min introducing auric thiocyanate (T) in amounts of (1.1-4.9)·10^-5 with molar ratio A/T of 1/(0.25-4). EFFECT: improved quality.