Abstract: A color-forming aminopyrimidine coupler represented by formula (I): ##STR1## where R.sub.1, R.sub.2, and R.sub.3 independently represent a hydrogen atom, a halogen atom, an alkoxy group, an aryloxy group, a heterocyclic-oxy group, an alkylthio group, an arylthio group, a heterocyclic-thio group, a substituted or unsubstitued amino group, a heterocyclic group bonding to the pyrimidine ring via a nitrogen atom thereof, an alkyl group or an aryl group; provided that at least one of R.sub.1, R.sub.2 and R.sub.3 is an unsubstituted or substituted amino group, and that when any one of R.sub.1, R.sub.2 or R.sub.3 contains a sulfonic acid group or a salt thereof, R.sub.1 , R.sub.2 or R.sub.3 contains at least one linear or branched alkyl group and that the total carbon atoms in the alkyl group(s) are to be more than 8; and R.sub.

Abstract: A multi-layered color photographic light-sensitive material which comprises a support having thereon at least two light-sensitive silver halide emulsion layers which provide images having substantially different hues, with the light-sensitive material including 2-equivalent couplers and/or 4-equivalent anilinopyrazolone couplers and at least one of the light-sensitive silver halide emulsion layers or a colloidal layer of the light-sensitive material containing a hydroquinone derivative or a hydroquinone precursor substituted with a heterocyclic monothio group and an aliphatic monothio group, an aryl monothio group, an aliphatic oxy group, an aryloxy group or a heterocyclic oxy group and having a ballasting group containing 8 or more carbon atoms.

Abstract: A practical, useful gelatino silver halide photo-sensitive material having incorporated therein a compound represented by the following formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.

Abstract: A process for producing 2,2,4-trimethyl-6-hydroxy-7-substituted chromans which comprises reacting 2-substituted hydroquinones with 2-methyl-2,4-pentanediol in the presence of a Friedel-Crafts catalyst.

Abstract: A color photographic light-sensitive material comprising a silver halide photographic emulsion containing (1) at least one compound selected from the group consisting of (a) a compound represented by the following general formula (I);cp - Z (I)wherein Cp represents a monovalent residue of a magenta or yellow coupler residue in which one hydrogen atom of the active methylene group is replaced by a coupling off group Z eliminated upon coupling reaction with an oxidation product of an aromatic primary amine color developing agent, and Z represents a nitrogen-containing coupling-off group connected to Cp at a nitrogen atom thereof, and (b) a 4-position unsubstituted 3-arylamino-5-pyrazolone derivative, and (2) at least one compound represented by the following general formula (II);q - sh (ii)wherein Q represents a heterocyclic group, bonded directly or indirectly thereto and containing at least one of a --SO.sub.

Abstract: A silver halide color photographic material comprising a support having thereon at least a silver halide emulsion layer containing a hydrophobic phenolic or naphtholic cyan dye forming coupler together with a 2-(2'-hydroxyphenyl)benzotriazole compound. The color photographic material provides a cyan dye image having improved moisture resistance and high fastness to heat.

Abstract: A photographic silver halide emulsion containing at least one dinuclear merocyanine sensitizing dye, and at least one compound represented by the following formula: ##STR1## wherein D represents a divalent aromatic group, R.sub.2, R.sub.3, R.sub.4, and R.sub.5 each represents a hydrogen atom, a hydroxyl group, an alkoxyl group, an aryloxy group, a halogen atom, a heterocyclic group, a mercapto group, an alkylthio group, an arylthio group, a heterocyclic thio group, an amino group, an alkylamino group, a cycloalkylamino group, an arylamino group, a heterocyclic amino group, an aralkylamino group, or an aryl group.

Abstract: A silver halide photographic emulsion containing the combination of (i) at least one cyanine dye wherein two basic 5-membered and/or 6-membered nitrogen-containing heterocyclic nuclei are linked by methine groups having an odd number of carbon atoms not exceeding 7 and the substituents on the nitrogen atoms in the heterocyclic nuclei are aliphatic groups or aromatic groups with at least one of the substituents on the nitrogen atom being an alkyl group having a sulfo group or a carboxyl group, and (ii) at least one substantially colorless nitrogen-containing heterocyclic organic base selected from the group consisting of a benzothiazole, a benzothiazolone, a naphthothiazole, a naphthothiazolone, and a quinolone in a quantity sufficient to supersensitize.

Abstract: Fine grain silver halide photographic emulsions adapted for electron beam recording containing at least one compound represented by the following formula; ##SPC1##Wherein A represents an aliphatic group (substituted or unsubstituted), preferably an alkyl group, a substituted alkyl group, an aryl group, a substituted aryl group or a 5- or 6-membered heterocyclic ring containing at least one nitrogen atom, R.sub.1 and R.sub.2 represent a hydrogen atom or a lower alkyl group, and n represents 0 or 1.

Abstract: Tri-substituted hydroquinone compounds having an aryl-tetrazol-5-ylthio group and at least one thioether group useful as photographic additives.

Abstract: A color photographic silver halide light-sensitive material containing a 2-equivalent alpha-acylacetoamide yellow dye-forming coupler and a monoalkylhydroquinone.

Abstract: A silver halide photographic material having increased sensitivity and gradient and being free from fog formation on storage, comprising a support and an emulsion layer containing very fine silver halide grains and containing a nitrogen-containing heterocyclic organic compound having a hydroxylamino group, such as 2-hydroxylamino-4,6-di(ethylamino)-1,3,5-triazine or 2,4-di(hydroxylamino)-6-diethylamino-1,3,5-triazine. The photographic material is useful for recording fine images with a superior sharpness, and the incorporation of the heterocyclic compound increases the sensitivity in spite of the fine grain size of the silver halide.

Abstract: A silver halide photographic material having improved sensitivity unaccompanied by an increase in fog formation containing, in a photographic layer thereof, an organic compound having a nitrogen-halogen bond in the molecule.

Abstract: A silver halide light-sensitive material which comprises a light-sensitive silver halide emulsion containing a compound represented by the following formula (I): ##SPC1##wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 each represents a hydrogen atom or a lower alkyl group; and R.sub.6 and R.sub.7 each represents a hydrogen atom, a lower alkyl group or a lower alkoxy group or can combine to form a condensed ring, and X.sup.- represents an anion.

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 direct positive silver halide photographic emulsion containing1. at least one dimethine dye having the general formula (I): ##EQU1## 2. AT LEAST ONE COMPOUND HAVING THE GENERAL FORMULA (II): ##SPC1##3. at least one compound having the general formula (III) ##EQU2## or the general formula (IV) ##SPC2##wherein Y, Y.sub.o, Z, L.sub.1, L.sub.2, R.sub.o, m, n, X, Z.sub.1, R.sub.1, X.sub.1, a, p, q, Y.sub.1, Y.sub.2, m.sub.1, R.sub.3, r, X.sub.2 and X.sub.3 are as hereinafter defined.

Abstract: A silver halide photographic emulsion for direct positives, containing a fluorene compound having at least one nitro group as a substituent.

Abstract: An incorporated-coupler type multi-layer color photographic sensitive material comprising a support and at least two photosensitive emulsion layers thereon which form images having a different color from each other on color development, wherein at least one of the photosensitive emulsion layers comprises two or more unit layers, with at least one of the unit layers containing a hydroquinone derivative. Interlayer color correction is obtained in the color photographic sensitive material.