Abstract: Photographic base materials are described which contain on at least one side thereof a coating whose binder component is produced predominantly from unsaturated compounds and which has been hardened by means of energy supplying radiation. Discoloration in connection with wet developing is avoided by including within the coating material, before hardening thereof, at least one unsaturated monomeric, oligomeric or polymeric hydroxyfunctional substance and by maintaining the molal concentration of the hydroxyl groups at a value of at least 2. The coating material as defined in the invention is suited for use as a base for photographic layers which are developed wet, as well as for those which are developed dry.

Abstract: A multilayer, waterproof photographic paper support includes a paper which is coated with a layer of radiation hardened varnish or varnish color and a barrier layer is positioned between the paper and varnish layer. The barrier layer comprises a polymer, film-forming material, produced either by extrusion coating, a coating of an aqueous solution or dispersion.