PROCESS FOR THE PREPARATION OF SILVER HALIDE EMULSIONS

摘要

The photographic properties such as sensitivity and graininess of silver halide emulsions can be improved by performing the precipitation of silver halide and/or the afterripening in presence of silicic acid sols instead of or in admixture to gelatin as protective colloid. The agglomeration of silicic acid particles which often occurs at high concentrations of salts can be avoided by addition of ethanol or of water-soluble polymers or by the preparation of such polymers in the silicic acid sol.