Method for controlling speed and contrast of photographic emulsions

Claim 1

A LIGHT-SENSITIVE PHOTOGRAPHIC ELEMENT INCLUDING A SUPPORT AND A COLOR-FORMING SILVER HALIDE EMULSION HAVING INCREASED SPEED AND BEING CAPABLE OF PRODUCING A SYE IMAGE OF INCREASED CONTRAST UPON EXPOSURE AND COLOR DEVELOPMENT, COMPRISING A PHOTOGRAPHIC LAYER CONTAINING DISPERSED, DISCRETE PACKETS CONTAINING A SIVLER HALIDE SELECTED FROM THE CLASS CONSISTING OF SILVER CHLORIDE AND SILVER BROMOIODIDE AND A COLOR-FORMING COMPOUND CAPABLE OF COUPLING WITH THE OXIDATION PRODUCTS OF AN AROMATIC PRIMARY AMINE PHOTOGRAPHIC COLOR-DEVELOPING AGENT TO PRODUCE A COLORED IMAGE, THE SILVER HALIDE IN SAID PACKETS BEING SENSITIZED TO A WAVELEGTH LONGER THAN BLUE, SAID LAYER CONTAINING A SPECTRALLY UNSENSITIZED, UNFOGGED SILVER CHLORIDE EMULSION CONTAINING AT LEAST 80 MOLE PERCENT OF SILVER CHLORIDE AND BEING OF SUFFICIENTLY LOW SPEED SO THAT NO VISIBLE IMAGE IS PRODUCED THREIN UPON EXPOSURE AND COLOR DEVELOPMENT OF SAID SPECTRALLY SENSITIZED SILVER HALIDE EMULSION, SAID UNSENSITIZED SILVER CHLORIDE EMULSION BEING PRESENT IN AN AMOUNT OF FROM 0.1 TO 4 TIMES THE SMOUNT OF SILVER PER MOLE OF SILVER IN SAID SPECTRALLY SENSITIZED SILVER HALIDE EMULSION AND HAVING A BLUE-LIGHT SPEED LESS THAN 1/100 THAT OF SAID SPECTRALLY SENSITIZED SILVER HALIDE EMULSION.