Photographic recording material comprising leuco dye for cold silver image tone

Claim 1

A photographic recording material comprising a silver halide emulsion layer and a leuco compounds which, upon photographic processing, is capable of generating in an imagewise manner a blue tone in developed silver images wherein the leuco dye has the structural formula: ##STR4## wherein: R 1 is an unsubstituted or a substituted aliphatic group having from 1 to about 20 carbon atoms; R 2 is hydrogen; an unsubstituted or a substituted, straight or branched chain alkyl group having from 1 to about 10 carbon atoms; an unsubstituted or a substituted cycloalkyl group having from 3 to about 8 carbon atoms in the ring; or an aryl group having from 6 to about 10 carbon atoms; R 3 is hydrogen; an unsubstituted or a substituted alky group having from 1 to about 10 carbon atoms; an unsubstituted or a substituted aryl group having from 6 to about 10 carbon atoms; an unsubstituted or a substituted cycloalkyl group having from 3 to about 8 carbon atoms in the ring; nitro; or cyano; R 4 is as defined for R 3 , or R 4 can be hydroxy, sulfo or carboxy; R 5 is hydroxylalkyl; alkylsulfonamidoalkyl; alkoxyalkyl; or alkylsulfonic acid wherein the akyl or alkoxy group has from 1 to about 12 carbon atoms or an aryl group having from 6 to about 10 carbon atoms; R 6 is as defined for R 5 ; R 7 is hydrogen, alkyl, alkoxy, sulfoalkoxy or sulfoaryl; and R 8 as defined for R 7 .