Process for obtaining permanent representations of full-tone, full-color photographs on a base

A process for producing permanent full-color, full tone images on a base comprising the successive steps of:

• (a) applying a drying silk-screen printing oil preparation to a temporary backing, drying, then applying a light-sensitive ammonium bichromate emulsion, containing egg white, to the oil preparation on the temporary backing;
• (b) then exposing the backing to light, with a separation negative of an original photograph thereon;
• (c) dusting said exposed backing with a ceramic color or mineral pigment selected from a set of transparent and opaque ceramic colors or a set of transparent and opaque mineral pigments;
• (d) drying said backing;
• (e) removing ammonium bichromate from the ammonium bichromate emulsion on the backing, by rinsing;
• (f) obtaining and drying a color picture on said backing;
• (g) applying a polyvinyl alcohol solution to the backing, with the color picture thereon, to form a special layer separating the color picture from a subsequent layer of light-sensitive emulsion;
• (h) drying the backing and the color picture;
• (i) repeating the above process three more times, beginning with the application of the light-sensitive emulsion in step (a) and continuing through to step (h), with a different color on the same backing each of three times, wherein color pictures, successively obtained, are placed one on top of the other in registry;
• (j) transferring a resulting full-color, full-tone picture obtained from four different colors, during the initial process of steps (a) through (h) and the repetition thereof, three subsequent times;
• from the backing to the base;
• (k) fixing the picture to the base;
• (l) obtaining a full-color, full tone image on a base.