FINE GRAIN SILVER HALIDE PHOTOGRAPHIC EMULSION CONTAINING HEMICYANINE SENSITIZING DYE

1361089 Sensitized silver halide emulsions FUJI PHOTO FILM CO Ltd 6 Oct 1971 [7 Oct 1970] 46531/71 Heading G2C A silver halide photographic emulsion comprising grains at least 95% by number of which are not greater than 0À2 micron in diameter or whose mean grain diameter is not more than 0À18 micron, and at least one hemicyanine dye having one of the general formulae (I) or (II) in which Z completes an optionally substituted heterocyclic nucleus comprising five or six atoms in the heterocyclic ring containing the nitrogen atom shown, R represents optionally substituted alkyl (1-5C), A is H, B is aryl e.g. phenyl or tolyl or A and B together form a ring, L is methine, R and the L connected to the heterocyclic ring optionally being connected by a polymethylene chain X is an anion, m is 1, 2 or 3 and n and p are 0 or 1.