Abstract: 2,5-BIS-(1',1'-Dimethylbutyl)hydroquinone and a process for the production thereof which comprises reacting hydroquinone with 2-methyl-1-pentene.

Abstract: A color photographic material comprising a support having coated thereon at least one silver halide emulsion layer containing a magenta dye forming coupler having a 3-anilino-5-pyrazolone ring in which the ortho position of the anilino group at the 3-position is substituted with a halogen atom, an alkyl group, an alkoxy group, an amide group, an aryl group, an aryloxy group, a cyano group, a nitro group, a hydroxyl group, or an amino group and having a hydrophobic residue of 8 to 32 carbon atoms, the silver halide emulsion layer or an emulsion layer adjacent to the silver halide emulsion layer containing a hydroquinone derivative having at least one substituent of at least 8 carbon atoms or a precursor capable of providing such a hydroquinone derivative by hydrolysis.The color photographic material provides magenta dye images having good color separation and less color fog and less color stains in the highlight areas.

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.

Abstract: A quick diffusion transfer process of forming color positive images by combining a photosensitive material portion prepared by superposing a photosensitive silver halide emulsion layer containing an amidrazone which becomes diffusible by an oxidation treatment (Type A) with an intermediate layer containing an amidrazone which does not become diffusible by the oxidation treatment (Type B) and an image-receiving material portion prepared by coating a composition containing an acid resistant coupler capable of forming a dye by the oxidative coupling with an amidrazone, exposing and black-and-white-developing the combined materials, subjecting material to an oxidation treatment in the superposed relationship to form color images, and then removing said photosensitive material portion.

Abstract: A color photographic material having at least one silver halide emulsion layer containing a 3-anilino-5-pyrazolone type magenta dye forming coupler and a phenolic compound for improving the light fastness of the magenta dye formed by the coupling reaction of the magenta dye forming coupler with the oxidation product of a color developing agent in combination with a nucleus-substituted hydroquinone, in which the reduction of the coupling reactivity of the magenta dye forming coupler during the storage of the color photographic material caused by the presence of the phenolic compound is prevented efficiently.

Abstract: A light-sensitive silver halide material for the high temperature and rapid color development at least 30.degree.C, which light-sensitive silver halide material comprises at least one spectrally sensitized silver halide photographic emulsion layer, the emulsion layer containing at least one sensitizing dye having an halogen ion concentration increasing effect.