Novel photographic products, processes and compositions

Claim 1

A PHOTOGRAPHIC FILM UNIT ADAPTED FOR PERFORMING A DIFFUSION TRANSFER PROCESS IN A LIGHTED AREA, SAID FILM UNIT COMPRISING: (A) A PHOTOSENSITIVE ELEMENT COMPRISING A SUBSTANTIALLY LIGHT-OPAQUE SUPPORT CARRYING BLUE-SENSITIVE, GREENSENSITIVE AND RED-SENSITIVE SILVER HALIDE EMULSION LAYERS, SAID EMULSIONS RESPECTIVELY HAVING ASSOCIATED THEREWITH A YELLOW DYE DEVELOPER, A MGENTA DYE DEVELOPER AND AN CYAN DYE DEVELOPER, EACH OF SAID DYE DEVELOPERS BEING PRESENT IN A LAYER BEHIND ITS RESPECTIVE SILVER HALIDE EMULSION LAYER, SAID SUPPORT LAYER POSSESSING SUFFICIENT OPACITY TO SUBSTANTIALLY PREVENT LIGHT BEING TRANSMITTED TRANSVERSELY THERETHROUGH TO SAID PHOTOSENSITIVE LAYERS; (B) AN IMAGE-RECEIVING ELEMENT ADAPTED TO BE BROUGHT INTO SUPERPOSED RELATIONSHIP WITH SAID PHOTOSENSITIVE ELEMENT, SAID IMAGE-RECEIVING ELEMENT INCLUDING A SUBSTANTIALLY LIGHT-OPAQUE SUPPORT AND AN IMAGE-RECEIVING LAYER, SAID SUPPORT POSSESSING SUFFICIENT OPACITY TO SUBSTANTIALLY PREVENT LIGHT BEING TRANSMITTED TRANSVERSELY THERETHROUGH TO THE PHOTOSENSITVE LAYERS WHEN SAID IMAGE-RECEIVING ELEMENT IS IN SUPERPOSED RELATIONSHIP WITH SAID PHOTOSENSITIVE ELEMENT, SAID IMAGERECEIVING ELEMENT ALSO INCLUDING A MASK RELEASABLY BONDED TO THE OUTER SURFACE OF SAID IMAGE-RECEIVING LAYER AND DEFINING AN IMAGE AREA THEREON; (C) SAID IMAGE-RECEIVING ELEMENT CONTAINING AT LEAST ONE POLYMERIC LAYER CAPABLE OF TRANSMITTING LIGHT INCIDENT UPON THE EDGE OF SAID LAYER INWARDLY FROM SAID EDGE BY INTERNAL REFLECTION A DISTANCE GREATER THAN THE WIDTH OF SAID MASK SO THAT LIGHT ENTERING SAID EDGE MAY BE EMITTED INWARDLY OF SAID MASK WHEN SAID PHOTOSENSITIVE ELEMENT IS IN SUPERPOSED PROCESSING RELATIONSHIP WITH SAID IMGE-RECEIVING ELEMENT, SAID POLYMERIC LAYER CONTAINING TITANIUM DIOXIDE IN AN AMOUNT LESS THAN 1%, BY WEIGHT, OF SAID POLYMER, SAID CONCENTRATION OF TITANIUM DIOXIDE BEING EFFECTIVE TO PREVENT SAID INWARD OR LATERAL TRANSMISSION OF LIGHT INCIDENT ON SAID EDGE, SAID CONCENTRATION OF TITANIUM DIOXIDE BEING INSUFFICIENT TO VISIBLY COLOR SAID POLYMERIC LAYER; AND (D) A RUPTURABLE CONTAINER RELEASABLY HOLDING A PROCESSING COMPOSITION AND SO POSITIONED AS TO BE ADAPTED TO RELEASE SAID PROCESSING COMPOSITION FOR DISTRIBUTION BETWEEN SAID IMAGE-RECEIVING ELEMENT AND SAID PHOTOSENSITIVE ELEMENT AS SAID ELEMENTS ARE BROUGHT INTO SUPERPOSED RELATIONSHIP, SAID PROCESSING COMPOSITION COMPRISING WATER AND ALKALI, A FILM-FORMING MATERIAL EFFECTIVE TO INCREASE THE VISCOSITY OF SAID COMPOSITION, AND CARBON BLACK IN AN AMOUNT APPROXIMATELY 1% OR LESS, BY WEIGHT, OF SAID WATER, SAID QUANTITY OF CARBON BLACK BEING EFFECTIVE TO PREVENT LATERAL TRANSMISSION OF LIGHT ENTERING AN EDGE OF A LAYER OF SAID PROCESSING COMPOSITION.