Diffusion transfer photosensitive film unit for silver transfer image

A diffusion transfer photosensitive black and white film unit as comprising:

• a photosensitive element comprising an opaque support and carrying, in succession, a polymeric acid layer, a timing layer, a spacer layer, an interlayer, an antihalation layer comprising from about 1.5% to about 25% by weight of an antihalation material, from about 30% to about 50% by weight of titanium dioxide and from about 25% to about 68.5% by weight of a binder, a photosensitive silver halide layer and a topcoat layer;
• an image-receiving element comprising a transparent support and carrying, in succession, an image-receiving layer comprising silver nucleating material, an undercoat layer and an overcoat layer, said image-receiving element in superposed relationship or adapted to be placed in superposed relationship with said photosensitive element so as to receive image silver released from said photosensitive element upon photoexposure and development;
• means providing an aqueous alkaline processing composition for initiating said development of said photosensitive silver halide after said photoexposure to form an image on said image-receiving layer, wherein said processing composition comprises an amount of titanium dioxide capable of forming a light-reflecting layer during photographic processing which provides a white background against which to view the final image;
• a silver halide solvent;
• and
• a silver reducing agent.