Direct positive silver halide photographic light-sensitive materials

Claim 1

A direct-positive silver halide photographic light-sensitive material comprising a support having thereon at least one inner latent image light-sensitive silver halide photographic emulsion layer, and containing in said photographic emulsion layer or at least one of other hydrophilic colloid layers a mercapto compound represented by the following general formula (I) or (II) as a nucleating agent: ##STR20## wherein Z represents an atomic group necessary to form a mononuclear or condensed nitrogen-containing heterocyclic ring, L 1 represents a divalent organic group, m represents 0 or 1, L 2 represents --CONR--, --NRCO--, --SO 2 NR--, --NRSO 2 --, --OCO--, --COO--, --S--, --NR--, --CO--, --SO--, --SO 2 --, --OCOO--, --NRCONR'--, --NRCOO--, --OCONR-- or --NRSO 2 NR'--, wherein R and R' each represents a hydrogen atom, an alkyl group or an aryl group, L 3 represents --CO--, --SO-- or --SO 2 --, R 1 represents a hydrogen atom, an alkyl group, a halogen atom, an alkoxy group, a carbonamide group or a sulfonamide group, R 2 represents a hydrogen atom or an alkoxycarbonyl group, R 3 represents an acyl group, an alkylsulfonyl group, an arylsulfonyl group, an alkylsulfinyl group, an arylsulfinyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, a sulfamoyl group or a sulfinamoyl group, R 4 represents a hydrogen atom, and R 3 may form the partial structure: ##STR21## of hydrazone together with R 4 and a nitrogen atom, and R 5 represents a hydrogen atom or forms the partial structure: --C═N-- of hydrazone together with L 3 and a nitrogen atom, wherein one of two bonds of the carbon atom in ##STR22## and the other of two bonds of the carbon atom links to R", R" represents an alkyl group, an aryl group or a heterocyclic group, and R"' represents a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group.