Photosensitive elements having high surface concentration of silver halide and stabilized against contamination fog
Abstract
Abstract A PHOTOGRAPHIC ELEMENT COMPRISING A SILVER HALIDE EMULSION LAYER IN WHICH MOST OF THE SILVER HALIDE HAS BEEN CONCENTRATED AT ONE SURFACE OF THE EMULSION LAYER WHEREIN THE SILVER HALIDE EMULSION CONTAINS, AFTER SENSITIZATION AND BEFORE THE SILVER HALIDE GRAINS HAVE BEEN CONCENTRATED AT ONE SURFACE, A MEMBER SELECTED FROM THE GROUP CONSISTING OF GLYOXAL AND MUCOCHLORIC ACID IN A CONCENTRATION TO EFFECTIVELY CONTROL CONTAMINATION FOG. SAID CONCENTRATION BEING BETWEEN ABOUT 1 TO ABOUT 20 GRAMS PER GRAM ATOM OF SILVER WITH THE MEAN GRAIN SIZE OF SAID SILVER HALIDE GRAINS BEING ABOUT 0.5U TO ABOUT 2.5U AND TO PROVIDE HARDENING OF THE VERY THIN LAYER OF GELATIN ENVELOPING THE SILVER HALIDE GRAINS. THIS FOG STABILIZING EFFECT APPEARS TO BE UNIQUE TO THESE AGENTS AND IS NOT FOUND IN OTHER KNOWN PHOTOGRAPHIC SILVER HALIDE EMULSION HARDENERS.
Inventors
- 👤 Roger G L Audran
- 👤 Claude G Dostes
- 👤 Claude M Marechal
Bibliographic Details
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