Patent ID: 6306569
Filing Date: 2001-10-23
Classification: G03C

Abstract:
A silver halide emulsion containing chemically sensitized silver halide grains, wherein the silver halide grains are prepared by ripening silver halide grains to be digested by the addition of(1) fine silver halide grains smaller than the silver halide grains to be digested,(2) a solution containing silver ions,(3) a solution containing halide ions and a solution containing silver ions, or(4) a fine silver halide grain emulsion and a solution containing silver ions;wherein the amount of the addition in terms of silver ion is 0.05 to 8 mol % per mol of silver in the silver halide grains to be digested; and the addition is performed after 40% or more of the reaction of chalcogen sensitizer that is added during the chemical sensitization step is completed and before the silver halide grains are optimally ripened.