Photographic emulsion sensitized with gold compounds and sulfur sensitizers

Claim 1

A PHOTOGRAPHIC SILVER HALIDE EMULSION IN WHICH THE CARRIER FOR THE SILVER HALIDE IS A COLLOIDAL MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYVINYL ALCOHOL, HYDROLYZED POLYVINYL ACEATE CONTAINING AN ACETATE GROUP CONTENT EQUIVALENT TO FROM 59 TO 71 PERCENT BY WEIGHT OF POLYVINYL ACETATE, POLYVINYL ACETALDEHYDE ACETAL CONTAINING POLYVINYL ACETALDEHYDE ACETAL GROUPS EQUIVALENT TO AT LEAST 50 PERCENT BY WEIGHT OF POLYVINYL ACETALDEHYDE ACETAL AND POLYVINYL ALCOHOL HYDROXYL GROUPS EQUIVALENT TO AT LEAST 15 PERCENT BY WEIGHT OF POLYVINYL ALCOHOL, POLYVINYL PROPIONALDEHYDE ACETALS CONTAINING POLYVINYL ALCOHOL HYDROXYL GROUPS EQUVALENT TO FROM 45 TO 60 PERCENT BY WEIGHT OF POLYVINYL ALCOHOL, POLYVINYL BUTYRALDEHYDE ACETALS CONTAINING POLYVINYL ALCOHOL HYDROXYL GROUPS EQUIVALENT TO FROM 60 TO 80 PERCENT BY WEIGHT OF POLYVINYL ALCOHOL AND HYDROLYZED CELLULOSE CARBOXYLIC ESTERS IN WHICH THE ACYL GROUPS CONTAIN FROM 2 TO 3 CARBON ATOMS SAID CELLULOSE ESTERS CONTAINING FROM 19 TO 33 PERCENT BY WEIGHT OF SAID ACYL GROUPS, SENSITIZED WITH A SOLUBLE GOLD COMPOUND AND A SULFUR SENSITIZER, THE CONCENTRATION OF THE GOLD COMPOUND IN THE EMULSION BEING EQUAL TO FROM ABOUT 0.0005 TO ABOUT 0.025 PER CENT BY MOLS OF THE SILVER HALIDE PRESENT IN THE EMULSION, AND THE CONCENTRATION OF THE SULFUR SENSITIZER BEING EQUAL TO ABOUT 0.006 TO ABOUT 2.5 PERCENT BY MOLS OF THE SILVER HALIDE PERSENT IN THE EMULSION.