Silver halide emulsions photosolubilized with optical sensitizing dyes and silver mercaptides

Claim 1

A PHOTOGRAPHIC SILVER HALIDE EMULSION LAYER COMPRISING BEFORE IMAGEWISE EXPOSURE TO ACTINIC RADIATION, SILVER HALIDE CRYSTALS HAVING ASSOCIATED THEREWITH (A) FROM 0.015 G. TO 0.075 G. PER MOLE OF SILVER OF AN OPTICAL SENSITIZING DYE SELECTED FROM THE GROUP CONSISTING OF CYANINE, CARBOCYANINE AND MEROCYANINE DYES, AND (B) A SILVER MERCAPTIDE OF AN ORGANIC MERCAPTO COMPOUND, SAID MERCAPTIDE BEING PRESENT IN ABOUT 90% OF THE AMOUNT, IN TERMS OF THE RATIO OF ITS WEIGHT TO THE SURFACE AREA OF SAID SILVER HALIDE CRYSTALS, THAT WHEN ADMIXED IN SUCH RATIO WITH AN AQUEOUS SILVER CHLOROBROMIDE (70/30 MOLE PERCENT) GELATIN DISPERSION CONTAINING 57 G. OF GELATIN PER MOLE OF AG AND .57 MG. OF AG PER ML., AND SAID SILVER CHLOROBROMIDE DISPERSION IS TREATED WITH 10%, BY WEIGHT, AQUEOUS SODIUM THIOSULFATE (SO THAT WHEN THE RESULTING MIXTURE CONTAINS 0.29 MG. OF SILVER AND 100 MG. OF SODIUM THIOSULFATE), AT LEAST THREE TIMES THE AMOUNT OF SILVER CHLOROBROMIDE REMAINS UNDISSOLVED AS IN A SIMILAR DISPERSION SUCCESSIVELY TREATED WITH 5%, BY WEIGHT, AQUEOUS SODIUM HYPOCHLORITE AND 10%, BY WEIGHT, AQUEOUS SODIUM THIOSULFATE (SO THAT THE RESULTING MIXTURE CONTAINS 0.29 MG. OF SILVER, 25 MG. OF SODIUM HYPOCHLORITE AND 100 MG. OF SODIUM THIOSULFATE), AFTER VIGOROUS AGITATION OF THE DISPERSIONS FOR 30 SECONDS AT 25*C.