Diffusion transfer photographic process utilizing development restrainers

Claim 1

A PROCESS OF FORMING A MULTICOLOR IMAGE BY DIFFUSION TRANSFER COMPRISING (A) EXPOSING A PHOTOSENSITIVE ELEMENT COMPRISING A SUPPORT CARRYING, IN TURN, A LAYER INCLUDING A RED-SENSITIVE SILVER HALIDE EMULSION, A LAYER INCLUDING A GREEN-SENSITIVE SILVER HALIDE EMULSION AND A LAYER INCLUDING A BLUE-SENSITIVE SILVER HALIDE EMULSION, SAID SILVER HALIDE EMULSIONS HAVING ASSOCIATED THEREWITH, RESPECTIVELY, A CYAN DYE DEVELOPER, A MAGENTA DYE DEVELOPER AND A YELLOW DYE DEVELOPER, (B) APPLYING AN AQUEOUS ALKALINE PROCESSING SOLUTION TO SAID PHOTOSENSITIVE ELEMENT TO INITIATE DEVELOPMENT OF EXPOSED SILVER HALIDE, SAID DYE DEVELOPERS BEING OXIDIZED AND THEREBY IMMOBILIZED WHERE DEVELOPMENT OCCURS, (C) CONTINUING SAID DEVELOPMENT OF EXPOSED SILVER HALIDE FOR A PREDETERMINED PERIOD, SAID PREDETERMINED DEVELOPMENT PERIOD BEING SUFFICIENTLY LONG TO FORM AN IMAGEWISE DISTRIBUTION OF DIFFUSIBLE UNOXIDIZED DYE DEVELOPER IN UNDEVELOPED AREAS OF EACH OF SAID SILVER HALIDE EMULSION LAYERS AS A FUNCTION OF SAID DEVELOPMENT, SAID UNOXIDIZED DYE DEVELOPERS BEING TRANSFERRED, BY DIFFUSION, TO AN IMAGE-RECEIVING LAYER IN SUPERPOSED RELATIONSHIP WITH SAID SILVER HALIDE EMULSION LAYERS TO FORM SAID MULTICOLOR IMAGE, (D) SAID PROCESS INCLUDING THE STEP OF RESTRAINING FURTHER DEVELOPMENT OF EXPOSED SILVER HALIDE AFTER SAID PREDETERMINED DEVELOPMENT PERIOD, SAID RESTRAINING BEING EFFECTED BY DIFFUSING TO AT LEAST ONE OF SAID SILVER HALIDE EMULSION LAYERS A REAGENT WHICH RENDERS SAID SILVER HALIDE SUBSTANTIALLY LESS DEVELOPABLE, SAID REAGENT BEING INITIALLY CONTAINED IN A LAYER OF SAID PHOTOSENSITIVE ELEMENT OTHER THAN A LAYER CONTAINING A SILVER HALIDE EMULSION, WHEREBY SAID MULTICOLOR TRANSFER IMAGE EXHIBITS GREATER COLOR SEPARATION.