MANUFACTURE OF SILVER HALIDE EMULSION

摘要

PURPOSE:To prevent foaming in manufacturing silver halide and to prevent production of coarse grains and grains causing fogging by incorporating a water- soluble alkaline earth metal compd. in the colloidal soln. to which a silver salt soln. and a halide soln. are added to react them. CONSTITUTION:A water-soluble silver salt is reacted with a water-soluble halide with stirring in a soln. contg. a hydrophilic colloid in the presence of a water- soluble alkaline earth metal compd. to form silver halide (AgX). Such a compd. may be added at an optional time of the precipitation and physical aging of an AgX emulsion. Occurrence of foaming accompanied by stirring is restrained, thus enhancing stability of manufacture, and shortening the manufacturing cycle. Production of coarse grains and grains of AgX causing fogging can be controlled by restraining the foaming. The obtained emulsion is widely used for manufacture of general purpose black-and-white and color photographic, X-ray photographic, and other AgX photosensitive materials.