Hybrid color films with dye developer and thiazolidine dye releaser

Claim 1

A diffusion transfer film unit comprising a first sheet including a support and a second sheet including a support, said first and second sheets being in superposed relationship or adapted to be placed in superposed relationship with said supports outermost; said first support carrying a red-sensitive silver halide emulsion having associated therewith a cyan image dye-providing material, a green-sensitive silver halide emulsion layer having associated therewith a magenta image dye-providing material, and a blue-sensitive silver halide emulsion layer having associated therewith a yellow image dye-providing material; an image-receiving layer carried on one of said supports; the only image dye-providing material associated with the silver halide emulsion layer closest to said image-receiving layer is an image dye-releasing thiazolidine, the only image dye-providing material associated with the silver halide emulsion most distant from said image-receiving layer is a dye developer, and the image dye-providing material associated with the other of said silver halide emulsions is either a dye developer or an image dye-releasing thiazolidine; said film unit including means providing a light-reflecting layer against which an image in said image-receiving layer may be viewed; and means providing a processing composition containing a silver halide solvent for distribution between the superposed sheets.