Process for forming a photographic magenta dye image

Claim 1

A process for forming a photographic magenta dye image comprising subjecting a silver halide photographic lightsensitive material to color development in the presence of a 2-equivalent 5-pyrazolone or pyrazolo (1,5-a) benzimidazole magenta coupler and an aromatic primary amine color developer, said coupler represented by the formula (II) or (III); a--oso.sub.2 --r.sub.1)m (II) (a'--oso.sub.2 ).sub.n R.sub.2 (III) wherein R 1 is a member selected from the group consisting of a straight chained, branched or cyclic alkyl, alkenyl, aryl, a 5- or 6-membered heterocyclic radical containing nitrogen, oxygen or sulfur, said members may have at least one substituent selected from the group consisting of halogen, nitro, hydroxy, carboxy, amino, sulfo, alkyl, alkenyl, aryl, alkoxy, aryloxy, arylthio, arylazo, acylamino, carbamoyl, ester, acyl, acyloxy, sulfonamido, sulfamoyl, sulfonyl, morpholino, piperidyl, piperadyl and imidazolyl; R 2 is selected from the group consisting of alkylene and arylene, which may have at least one substituent selected from the group consisting of lower alkyl, nitro and arylazo; A and A' are respectively an m-valent and n-valent residue of said magenta coupler resulting from removing the split-off group --OSO 2 --R 1 or --OSO 2 --R 2 from a coupling position of said coupler and which is represented by the following formulae ##STR27## wherein R 3 is selected from the group consisting of alkyl and cycloalkyl, which may have at least one substituent selected from the group consisting of halogen, nitro, cyano, aryl, alkoxy, aryloxy, carboxy, alkoxycarbonyl, aryloxycarbonyl, sulfo, sulfamoyl, carbamoyl, acylamino, ureid, heterocyclic, arylsulfonyloxy and oxo; aryl, and a 5- or 6-membered heterocyclic ring containing nitrogen, oxygen or sulfur, which may have at least one substituent selected from the group consisting of halogen, alkyl, alkoxy, aryloxy, carboxy, alkoxycarbonyl, acylamino, carbamoyl, alkylsulfonamido, arylsulfonamido, cyano and nitro; R 4 is selected from the group consisting of alkoxycarbonyl, aryloxycarbonyl, methoxy, ethoxy, phenoxy, tolyloxy, ethylthio, propylthio, phenylthio, carboxy, amino, N-alkylamino, N-arylamino amido, N-alkylacylamino, N-arylacylamino, ureid, thioureid, carbamoyl, guanidino, sulfamoyl and sulfonyl radical; R 5 is one to four monovalent radicals selected from the group consisting of hydrogen, halogen, alkyl, alkoxy, acylamido, carbamoyl and a sulfonyl radical; m is 1; and n is 2.