Abstract: A method for processing a silver halide color photographic material comprising the step of processing a silver halide color photographic material after imagewise exposure thereof with a color developer containing at least one aromatic primary amine developing agent and at least one hydrazine compound represented by formula (I) ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4, which may be the same or different, each represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group, provided that R.sup.1 and R.sup.2 may be linked to form a heterocyclic ring; R.sup.3 and R.sup.4 may be linked to form a heterocyclic ring; and at least two hydrazine moieties derived from the compound represented by formula (I) may be linked to form a dimer or polymer by any of R.sup.1, R.sup.2, R.sup.3, and R.sup.4.

Abstract: A super-high contrast negative type silver halide photographic material is disclosed, comprising a support having provided thereon at least one silver halide emulsion layer, said emulsion layer or layers or other hydrophilic colloidal layer or layers containing a hydrazine derivative, wherein said material further contains an acidic polymer incorporating not less than 20 mol % of a monomer unit containing an acid group and a hydrophobic polymer incorporating not more than 20 mol % of a monomer unit containing an acid group and having a glass transition temperature of not more than 50.degree. C. The material exhibits high contrast and high sensitivity without forming black spots even when processed with a stable developing solution.

Abstract: A process for producing a silver halide photographic emulsion by supplying a solution of a water-soluble silver salt and a solution of a water-soluble halide in the presence of a protective colloid is disclosed, said process comprising, in sequence:(A) the step of forming silver halide nuclear grains with a silver iodide content of 0 to 5 mol %, wherein the pH of the mother liquor is maintained at between 2.0 and -0.7 for at least the initial half of the period of said step;(B) the step of forming silver halide seed grains wherein the silver halide grains formed by step (A) above are made into monodisperse, substantially spherical seed grains; and(C) the step of increasing the sizes of the seed grains by addition of a solution of a water-soluble silver salt and a solution of a water-soluble halide and/or fine silver halide grains.

Abstract: Alkyl ketazine dyes are stabilized by the presence of poly(vinyl chloride) and/or poly(vinylidene chloride) binders in photothermographic emulsions.

Abstract: An optical recording medium is prepared by the use of spiropyrane whose molecular structure contains an alkyl chain having at least 10 more carbon atoms, and by the use of an LB film method or a spin coating method. This recording medium is of a structure wherein when irradiated with the UV, the spiropyrane is photo-isomerized to photomerocyane and, thereafter, when subsequently heated at 35.degree. to 40.degree. C. for 15 minutes, a J-aggregate of the photomerocyane is formed in very stabilized form. When the recording medium is irradiated with light of wavelength of visible spectrum, the color is bleached with the information consequently recorded. The optical recording medium herein disclosed is rewritable and can retain the recorded information for 5,000 hours or more.

Abstract: A light-sensitive material is described, comprising a support having provided thereon a light-sensitive layer containing at least a light-sensitive silver halide, a polymerizable compound, a color image forming substance, and a hydrazine derivative represented by formula (I): ##STR1## wherein R.sub.1 represents a monovalent group derived from a substituted or unsubstituted aromatic ring or aromatic heterocyclic ring; R.sub.2 and R.sub.3 each represents a substituted or unsubstituted aryl group; and R.sub.4 represents a hydrogen atom or a substituted or unsubstituted alkyl, aryl, alkoxycarbonyl, or carbamoyl group,in which the color image forming substance is immobilized by imagewise exposure to light followed by heat development under conditions substantially not containing water. The material exhibits high sensitivity and provides a color image through a simple, easy, and rapid dry processing step, with a reduced exposure time.

Abstract: A silver halide color photographic material is described, which comprises a support having provided therein at least a blue-sensitive emulsion layer, a green-sensitive emulsion layer and a red-sensitive emulsion layer, with the blue-sensitive emulsion layer comprising at least two layers differing in sensitivity, one of which is the highest sensitive emulsion layer containing at least one yellow-dye-forming coupler represented by the general formula (I), and the other of which is the lowest sensitive emulsion layer containing at least one yellow-dye-forming coupler represented by the general formula (II), whereby a yellow dye image having high maximum density and excellent in sharpness, graininess and light fastness can be produced: ##STR1##

Abstract: A silver halide photographic material comprising a support having thereon at least one emulsion layer which contains a silver chlorobromide or silver chloride each having an iodide content of 3 mol % or less. The monodispersed emulsion is prepared in a process comprising the steps of, in sequence, forming silver halide grains which have a grain size distribution represented by a variation coefficient of 0.2 or less, causing halogen replacement in silver halide grains by addition of a water-soluble bromide in a proportion of from 0.6 to 20 mol % with respect to the total silver halide in the presence of at least one sensitizing dye selected from among simple cyanine dyes, carbocyanine dyes, and dicarbocyanine dyes at individual surfaces of the silver halide grains, and then subjecting the resulting silver halide grains to chemical sensitization, thereby achieving enhanced sensitivity and improved pressure characteristics.

Abstract: A method for forming an image comprising heating in the presence of at least one of a base and a base generating agent, a heat-developable color light-sensitive material which comprises a support having thereon at least: (1) a light-sensitive silver halide, (2) a coupler capable of coupling with an oxidation product of a developing agent, (3) a hydrophilic binder, and (4) at least one compound represented by formula (Z) ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 each represents a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, a cycloalkyl group, an aralkyl group, a hydroxy group, an amino group, a substituted amino group, an alkoxy group, an acylamino group, an alkylsulfonylamino group, an arylsulfonylamino group, an aryl group, a carbamoyl group, a substituted carbamoyl group, a sulfamoyl group, a substituted sulfamoyl group, an acyl group, an acyloxy group, or an alkoxycarbonyl group, or R.sub.1 and R.sub.2, or R.sub.3 and R.sub.

Abstract: A silver halide photographic material having on a support at least one silver halide emulsion layer is disclosed, wherein the silver halide emulsion layer comprises a silver halide emulsion containing an oxidizing agent added thereto before chemical ripening of the emulsion, and the silver halide emulsion or a hydrophilic colloid layer contains a hydrazine derivative.

Abstract: The present invention provides a heat-developable photographic light-sensitive material comprising, on a support, at least containing a light-sensitive silver halide, a binder, a reducing agent, and an organic silver salt, wherein said organic silver salt is a silver salt of a pyrazolazole-type compound represented by formula (I) ##STR1## wherein R.sup.1 and R.sup.2 each represents a hydrogen atom or a substituent; Za, Zb, and Zc each represents a methine group, a substituted methine group, .dbd.N-- or --NH--; and one of the Za-Zb bond and Zb-Zc bond is a double bond and the other is a single bond.The present heat-developable photographic light-sensitive materials are capable of forming images of high density, with low fog, in a short period of time.

Abstract: A water-soluble silver salt and a water-soluble halide are reacted to obtain silver halide particles, and these are, after being demineralized, transhalogenated by adding thereto a water-soluble bromide in an amount of 0.1 mol % to 7 mol % of the total silver halide amount just before or during the sulfur sensitization, to obtain a sulfur-sensitized silver halide emulsion of high sensitivity. The present photographic materials contain the sulfur-sensitized silver halide emulsion and have high sensitivity and excellent pressure characteristics. The transhalogenation along with the sulfur sensitization is effective for the improvement of the sensitivity and the pressure characteristics of the materials.

Abstract: The process for improving radiant energy sensitivity of a film base coated with a dispersion of a normally crystalline polyacetylenic compound in a non-solvating liquid which is dried on the film surface; said polyacetylenic compound preferably having at least two conjugated acetylenic linkages and containing from 20 to 60 carbon atoms. The process comprises dispersing said normally crystalline polyacetylenic compound in the non-solvating liquid to a concentration of from about 2 to about 50% polyacetylene crystalline solids and ageing said dispersion by (a) storing at a temperature of between about 0.degree. C. and about 12.degree. C. for a period of from about 1 to about 30 days or (b) freezing said dispersion at a temperature between about -78.degree. C. and about -1.degree. C. for a period of from about 1 to about 75 hours or (c) a combination of the above ageing techniques any or all of which are completed before drying said dispersion on a substrate.

Abstract: A silver halide photographic light-sensitive material which is improved on fog without decreasing photosensitivity. The photographic material comprises a support and a photographic structural layer provided thereon containing at least one silver halide emulsion layer and at least one non-light-sensitive layer. A nitrogen-containing heterocyclic mercapto compound is contained at least two layers of the photographic structure layer, and at least one of these mercapto compound-containing layer is a non-light-sensitive layer.

Abstract: Radiation sensitive thermally developable imaging elements comprise:(a) photosensitive silver halide,(b) light insensitive silver salt oxidizing agent,(c) reducing agent for silver ions, and(d) a benzoyl acid class of antifoggant.The antifoggants are effective in both reducing spurious background image densities and in stabilizing the film against sensitometric changes during storage.

Abstract: The use of phenazine, phenoxazine and phenothiazine color forming developers in photothermographic dry silver emulsions provides a stable imaging system under both light and dark storage.

Abstract: Silver halide light-sensitive emulsions are protected against latent image fading by an effective amount of a 2-unsubstituted N-alkenyl-thiazolium salt compound.

Abstract: 5-substituted-1,2,3,4-thiatriazoles have been found to be supersensitizers for silver halide photographic emulsions spectrally sensitized to the infrared.

Abstract: A heat-developable light-sensitive material comprising a support having thereon at least one layer containing a light-sensitive silver halide, a reducing agent, a binder and an acetylene silver compound.The heat-developable light-sensitive material which contains the novel organic silver compound can provide images having high density and low fog when subjected to a short period of developing time even when a small amount of a base processor is used.

Abstract: A heat-developable photographic material is disclosed wherein the photographic material comprising at least one of an acid or a salt thereof having an acid dissociation constant pKa of 7 or less.