Abstract: A process is described for producing a lithographic printing plate. The process comprises the steps of imagewise exposing a single sheet lithographic plate material consisting of a flexible support, having thereon a) at least an underlayer containing an acid ossein gelatin, b) a light sensitive silver halide layer, and c) a physical development nucleating surface layer, and, after said exposing, processing said plate material in a diffusion transfer developer or alkaline activator solution to develop imaged portions as hydrophilic areas and retain non-exposed areas as oleophilic areas on said plate.

Abstract: A method of manufacturing a photosensitive element which can be exposed and enveloped by diffusion transfer processes to form a lithographic printing plate, said method comprising the steps of:(a) providing a support layer,(b) coating a negative acting silver halide emulsion layer onto said support layer, and(c) coating a physical development nucleation layer comprising particles onto said silver halide emulsion layer,wherein the coating of said physical development nucleation layer is performed with a coating composition which is at a temperature above 0.degree. C. and below 30.degree. C.

Abstract: A photographic element for use in a method of multicolor image formation by tanning development is a layered structure comprising an optionally primed base support, a layer of colloidal silver, a layer of sensitized silver halide emulsion in gelatin free of hardener, and at least one colored pigment or dye dispersed therein which absorbs radiation.

Abstract: A tannable photographic element and method therefore, the element comprising a uniquely treated opaque, translucent, or transparent base support and having at least one pigment in reactive association with the silver halide emulsion layer is useful in the graphic arts. The base support comprises an extremely thin gelatin subbing layer substantially free of hardener, or no subbing at all, on a primed base support.