DIFFUSION TRANSFER FILM UNIT

摘要

Photographic elements and film units are disclosed comprising a silver halide emulsion having associated therewith a quinone-coupling dye capable of forming a diffusible methylene base in alkaline processing composition. A diffusible dye is produced imagewise which diffuses to a dye image-receiving layer to provide a positive dye image. The diffusible dye is immobilized in the developed areas of the negative by reacting with an oxidized hydroquinone or catechol developing agent. The dye image-receiving layer may be located integral with the photo-sensitive element or may be located on a separate support adapted to be superposed on the photosensitive element after exposure thereof.