Process for producing silver halide photographic emulsion

摘要

A process for producing a silver halide photographic emulsion by supplying a solution of a water-soluble silver salt and a solution of a water-soluble halide in the presence of a protective colloid is disclosed, said process comprising, in sequence: (A) the step of forming silver halide nuclear grains with a silver iodide content of 0 to 5 mol %, wherein the pH of the mother liquor is maintained at between 2.0 and -0.7 for at least the initial half of the period of said step; (B) the step of forming silver halide seed grains wherein the silver halide grains formed by step (A) above are made into monodisperse, substantially spherical seed grains; and (C) the step of increasing the sizes of the seed grains by addition of a solution of a water-soluble silver salt and a solution of a water-soluble halide and/or fine silver halide grains.