Photographic silver halide emulsion

Claim 1

A photographic silver halide emulsion containing silver halide grains which have a core/shell structure and which are chemically sensitised at the surface thereof to provide density and speed, wherein, in the silver halide grains, at least one layer contains at least 25 mole percent of silver chloride and wherein the total content of silver chloride amounts to less than 30 mole percent and wherein the emulsion is chemically ripened at its surface to such an extent that the ratio R of the density D r obtainable after surface ripening to the density D u obtainable with the as yet non-surface-ripened, but otherwise identical, emulsion amounts to at least 3, the ratio R being determined by applying the ripened emulsion and the unripened emulsion to a layer support in exactly the same way, exposing them and then developing them for 17 minutes at 20° C. in a developer of the following composition: ______________________________________ ascorbic acid 10 g p-methylaminophenol 2.4 g Na.sub.2 CO.sub.3 (sicc.) 10 g KBr 2.0 g water to 1000 ml ______________________________________ and D r being the value of 90% of the maximum density and D u being obtained by exposure of the as yet unripened emulsion to the extent which leads to the density D r in the case of ripened emulsion.