Abstract: A photographic color coupler in which a hydrogen atom at the coupling position capable of coupling with an oxidation product of an aromatic primary amine developing agent is substituted with a group represented by the following general formula: ##STR1## wherein R and R', which may be the same or different, each represents an alkyl group, an alkenyl group, an aryl group, an alkoxy group, an alkylthio group, an aryloxy group, a hydroxy group, or an amino group, and R and R' can combine each other to form a ring; and X represents an oxygen atom or a sulfur atom. These photographic color couplers are a novel class of two-equivalent color forming couplers which are suitable for use in color photography. A color photographic light-sensitive material containing the above described photographic color coupler and a method of forming a color image comprising developing an exposed photographic light-sensitive material in the presence of the above described photographic color coupler are also disclosed.

Abstract: A color photographic material comprising a support having photographic layers thereon, with at least one of the photographic layers containing a non-diffusible colored coupler which releases, on coupling reaction with the oxidation product of a primary aromatic amino developing agent at development, a diffusible dye capable of being removed from the photographic layer, the non-diffusible colored coupler being represented by general formula (I):a--o--so.sub.2 --r--b (i)wherein R represents an alkylene group having 1 to 10 carbon atoms; A represents an image forming coupler residue containing a phenol nucleus or a naphthol nucleus, and wherein the --O--SO.sub.2 --R--B group is bonded to the coupling position of the coupler residue and the group can be released upon oxidative coupling with an aromatic primary amine developing agent to form a dye; and B represents a residue containing a chromophore.

Abstract: A photographic 2-equivalent color coupler capable of coupling with the oxidation product of an aromatic primary amine developing agent in which the coupling position is substituted with an isothiocyanato group; a color photographic emulsion, material, and developer containing the above-described 2-equivalent color coupler; and a method of forming color images comprising developing an exposed silver halide photographic material in the presence of the above-described 2-equivalent color coupler.

Abstract: A color photographic light-sensitive material having a silver halide emulsion layer containing a 1-phenyl-2-pyrazol-5-one magenta color-forming coupler, in which the 1-phenyl group of the coupler is substituted (1) with a R.sub.1 OOC-group, wherein R.sub.1 represents a group having about 8 to 26 carbon atoms, or (2) with a R.sub.2 OOC-group and a R.sub.3 OOC-group, wherein R.sub.2 and R.sub.3, which may be the same or different, each represents a group having about 4 to 18 carbon atoms; and in which the 3-position of the pyrazolone is substituted with an acylamino group, an ureido group, an alkoxy group, an amino group or an anilino group. The color photographic light-sensitive material provides stable magenta dye images having good spectral absorption characteristics.

Abstract: A color photographic material having differently sensitized silver halide emulsion layers including a silver halide emulsion layer containing a 3-anilino-5-pyrazolone magenta dye-forming coupler, the coupler having a halogen atom or an alkoxyl group at the 2-position of the anilino group and an aliphatic acylamino group at the 5-position of the anilino group.