Diffusion transfer photographic system using substituted...

Details Diffusion transfer photographic system using substituted... Diffusion transfer photographic system using substituted...

G - Physics

03

C

96/34

G03C 5/54 (1980.01)

Patent

CA 1178837

ABSTRACT OF THE DISCLOSURE There is disclosed a diffusion transfer photo- graphic system wherein development of an exposed photosensitive element with an aqueous alkaline processing composition is effected in the presence of a compound represented by the formula Image wherein X represents the nonmetallic atoms necessary to form a nucleus which completes a 5- or 6-membered heterocyclic moiety n said structure including substituted rings and fused rings; R is H, an alkali metal or a group which is cleavable in a photographic aqueous alkaline processing composition; and R1 is either a group which has a pKa of from about 7 to about 14 which is ionizable to an anion whereby the silver salt of the mercaptan (resulting from cleavage or ionization of -SR) is rendered more soluble in the pH range within which R1 is ionized to an anion than it is below that pH range, or a precursor of such a group.

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