Color image forming method and color image forming photo-sensitive material to be used therefor

Claim 1

An image forming process comprising: (a) providing a color layer upon a transparent base material, said color layer comprising a film-forming, water soluble, high molecular weight polymer, a photosensitive material which reacts with said polymer when exposed to light to insolubilize said polymer; and a coloring agent corresponding to the color to be printed from the separation plate, said coloring agent being used in a concentration such that the optical transmission density of the color layer is between 0.5 and 1.5 after exposure to light; (b) superimposing upon said color layer a color separated negative film of the original image which is to be printed; (c) exposing said color layer to light through said negative film; (d) washing said color layer and base material with water to remove non-exposed, water-soluble portions and to form a color image; (e) proofing said color image against a background; and (f) dyeing said proofed color image with a dye such that the optical density of the color image is at least 2.5 within the range of the active rays of light.