Silver halide photographic light sensitive materials

Claim 1

A silver halide photographic light-sensitive material which contains, in at least one layer thereof, a compound capable of releasing a fogging agent upon an oxidation-reduction reaction with an oxidation product of a developing agent under an alkaline condition during development processing, wherein said compound is a compound represented by the formula (I), (II), (III), (IV), (V) and (VI): ##STR32## wherein R 1 , R 2 and R 3 , which are the same or different, each represents a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, a cyano group, an alkoxycarbonyl group, a carbomoyl group a sulfamoyl group, a carboxyl group, a sulfo group, a sulfonyl group, an acyl group, a cyano group, a carbonamido group, a sulfonamido group or a heterocyclic group; or R 1 and R 2 are bonded to each other to form a benzene ring or a 5- to 7-membered heterocyclic ring; R 4 represents an alkyl group, an aryl group, an acyl group, a carbomoyl group, a sulfonyl group or a sulfamoyl group; Z 1 and Z 2 , which are the same or different, each represents a hydrogen atom or a group capable of being removed by hydrolysis under an alkaline condition; X represents a group which exhibits a fogging effect in a developing solution when released; and Y represents a group which exhibits a fogging effect in a developing solution when released as Y--SO 2 NH 2 or its anion, wherein Y represents a reducing group, a group capable of action on a silver halide during development to form a developable silver sulfide center or a quaternary salt, wherein Y represents a group having the partial structure of hydrazine, hydrazide, hydrazone, hydroxylamine, polyamine, enamine, hydroquinone, catechol, p-aminophenol, o-aminophenol, aldehyde or acetylene, a group having the partial structure of thiourea, thioamide, thiocarbamate, dithiocarbamate, thiohydantoin or rhodanine, or a tetrazolium salt, wherein X has the formula (X): (TIME).sub.m L.sub.1 (L.sub.2).sub.n A (X) wherein TIME represents a timing group which releases --L 1 (L 2 ) n A subsequently to the release of X, m represents 0 or 1; L 1 represents a group which is releasable for the release of X due to an oxidation-reduction reaction between compounds (I) and (IV) and a developing agent oxidation product under an alkaline condition when m is 0, or a group releasable from TIME of the released X when m is 1, wherein L 1 represents an aryloxy group, a heterocyclic oxy group, an arylthio group, a heterocyclic thio group or an azolyl group; L 2 represents a divalent linking group; n represents 0 or 1; and A represents a group which substantially exhibits a fogging effect to a silver halide emulsion when X exists in a developing solution in the form of X - or X--H.