Color photographic diffusion transfer process

Abstract

A color photographic diffusion transfer process in which a color photographic material having at least one silver halide emulsion layer and a layer adjacent to said silver halide emulsion layer, said layer containing a dye developer, is image-wise exposed, brought into superposed position with an image-receiving element, and then treated with an alkaline processing solution to immobilize the dye developer at the exposed portions of the silver halide emulsion layer and diffusion-transfer the dye developer at the nonexposed portions of the silver halide emulsion layer to the image-receiving element, with the alkali processing being conducted in the presence of 6,6',7,7' -tetrahydroxy-4,4,4',4'-tetramethyl-bis-2,2'-.Iadd.spirochroman. .Iaddend..[.spirocumarone.].

What is claimed is: 
     
       1. A color photographic diffusion transfer process comprising: imagewise exposing a photographic material having at least one silver halide emulsion layer and a dye developer present adjacent to the silver halide in said silver halide emulsion layer and   treating said photographic material in superposed relation with an image-receiving material with an alkaline processing solution whereby the dye developer at the exposed portions of the silver halide emulsion layer is immobilized and the dye developer at the unexposed portions of the silver halide emulsion layer is transferred by diffusion to the image-receiving material, said treatment with said alkaline processing solution being in the presence of 6,6',7,7'-tetrahydroxy-4,4,4',4'-tetramethyl-bis-2,2'-.Iadd.spirochroman. .Iaddend..[.spirocumarone.].   
     
     
       2. The color photographic diffusion transfer process as set forth in claim 1, in which .[.acid.]. .Iadd.said .Iaddend.6,6',7,7'-tetrahydroxy-4,4,4',4'-tetramethyl-bis-2,2- .Iadd.spirochroman .Iaddend..[.spirocumarone.]. is present in said photosensitive material. 
     
     
       3. The color photographic diffusion transfer process as set forth in claim 1, in which said 6,6',7,7'-tetrahydroxy-4,4,4',4'-tetramethyl-bis-2,2'- .Iadd.spirochroman .Iaddend..[.spirocumarone.]. is present in said alkaline processing solution. 
     
     
       4. The color photographic diffusion transfer process as set forth in claim 1, in which said 6,6',7,7'-tetrahydroxy-4,4,4',4'-tetramethyl-bis-2,2'- .Iadd.spirochroman .Iaddend..[.spirocumarone.]. is present in said image-receiving element. 
     
     
       5. The color photographic diffusion transfer process as set forth in claim 1, wherein said photographic material is a multi-layer photographic material having in order on a support, a red-sensitive silver halide emulsion layer, a green-sensitive silver halide emulsion layer, and a blue-sensitive silver halide emulsion layer, and wherein said 6,6',7,7' -tetrahydroxy-4,4,4',4'-tetramethyl-bis-2,2'- .Iadd.spirochroman .Iaddend..[.spirocumarone.]. is present in one of said silver halide emulsion layers. 
     
     
       6. The color photographic diffusion transfer process of claim 1, wherein 6,6',7,7'-tetrahydroxy-4,4,4',4'-tetramethyl-bis-2,2'- .Iadd.spirochroman .Iaddend..[.spirocumarone.]. is present at a level of 0.01-0.5 times on a molar basis of the amount of the photosensitive silver halide present.