Method for manufacturing silver halide emulsion in which the ripening temperature is less than the nucleation temperature

Abstract

A method for manufacturing a silver halide emulsion. By the method, a silver halide emulsion comprising monodisperse silver halide grains having a high aspect ratio can be manufactured without use of low molecular weight gelatin. The method has the steps of forming nuclei of silver halide grains by adding a water-soluble silver salt and a water-soluble halide salt to a protective colloid solution, applying Ostwald ripening to the precipitation nuclei to form seed grains of silver halide at a temperature lower than the temperature at which the silver halide nuclei are formed, to form silver halide seed grains which mainly comprises twin grains having an average grain size of less than 0.25 .mu.m and less than 50% of a surface area of each of the seed grains is occupied with {100} surface, growing the seed grains by adding a component to forming a silver halide to a liquid containing the seed grains.

Dependencies are inferred from the claim text.