Process for preparing monodispersed silver halide emulsions.

摘要

A process to prepare a monodispersed silver halide grain emulsion characterized in that said process comprises the steps of: (a) forming silver halide nuclei with single jet precipitation by adding a water-soluble silver salt solution to a reaction vessel containing a water-soluble halide salt solution in a hydrophilic colloid at a pCl of from 1.0 to 2.0 and at a temperature lower than 80 DEG C, said water-soluble silver salt solution being added in an amount of from 0.1 to 15% by weight of silver relative to the total silver, (b) stabilizing said silver halide nuclei to seed crystals for at least six minutes at a temperature lower than 80 DEG C and at pCl of from 1.5 to 3.0 by Ostwald ripening, and (c) growing said seed crystals by double jet precipitation of silver and halide salt solutions at a constant chloride ions excess of from 30 to 70%mol and a temperature lower than 80 DEG C.