Abstract: A heat developable light-sensitive material comprising a support having thereon (1) a light-sensitive silver halide emulsion, (2) at least one of a base and a base precursor, and (3) a binder, wherein the silver halide emulsion is one which is chemically sensitized in the presence of a sensitizing dye. With the heat developable light-sensitive material, decrease in sensitivity and formation of fog during preservation thereof are prevented.

Abstract: A heat developable photosensitive material comprising a support having thereon at least one light-sensitive layer comprising light-sensitive silver halide and a binder, wherein at least one layer contains a base precursor represented by the following general formula (I): ##STR1## wherein at least one of X, Y and Z, which may be the same or different, represents an electron-attractive substituent selected from the group (a) consisting of a halogen atom, a nitro group, an alkysulfinyl group, an arylsulfinyl group, an acyl group, a sulfamoyl group, a sulfamoyl group substituted with an aryl group, a substituted aryl group, an alkyl group or a substituted alkyl group, a carbamoyl group, a substituted carbamoyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an aryloxysulfonyl groups ##STR2## a nitroso group, ##STR3## wherein B is defined as in general formula (I), and R, R.sup.1 and R.sup.

Abstract: An internal latent image-type silver halide emulsion containing core/shell type silver halide grains with a mean grain size of about 0.4 .mu.m or less, the grains comprising a core of chemically sensitized silver halide and a shell of silver halide covering at least the light-sensitive sites of the core and the surface of the grains being chemically sensitized wherein the core is chemically sensitized to such an extent that the difference between fog density F.sub.1 and fog density F.sub.2 as defined herein (i.e., internal fog density) is at least 0.10. This emulsion permits the formation of good reversal images in which D.sub.max is high and D.sub.min is low and, furthermore, has a superior storage stability.

Abstract: A heat-developable photographic material having improved preservability, which comprises a support having thereon at least one heat-developable photgraphic layer, said photographic material containing a dye represented by formula (I) ##STR1## wherein R.sub.1 and R.sub.3 each represents an unsubstituted or substituted alkyl group or alkenyl group;R.sub.2 represents a hydrogen atom or an unsubstituted or substituted alkyl group, aryl group, alkenyl group, or aromatic heterocyclic group;R.sub.4 through R.sub.7 each represents a hydrogen atom or an unsubstituted or substituted alkyl group, aryl group, or alkenyl group; or R.sub.4 and R.sub.6 together form an unsubstituted or substituted alkylene group or alkenylene group;X.sub.1 represents an oxygen atom, a sulfur atom, or the group ##STR2## wherein R.sub.8 represents a hydrogen atom, an unsubstituted or substituted alkyl group, aryl group, or alkenyl group;Y.sub.

Abstract: A process for forming photographic image is disclosed, comprising photographically developing, in the presence of a polyalkylene oxide compound, a silver halide photographic light-sensitive material including at least one silver halide emulsion layer and containing in at least said emulsion layer or other hydrophilic layer a compound represented by formula (I). ##STR1## wherein: A and A' each represents a hydrogen atom or an alkalihydrolyzable group;R.sub.1, R.sub.2, and R.sub.3 each represents a group capable of substituting a hydrogen atom on the hydroquinone nucleus, with R.sub.2 and R.sub.3, A and R.sub.1, or A and R.sub.2 together form a ring; andX represents a group which shows a development-inhibiting effect after being released.

Abstract: Photographic recording materials which contain a developer substance or a precursor thereof produce better results if in addition they contain a sulphite, a disulphite or a compound capable of releasing sulphite in the photographic material.

Abstract: Direct positive photographic elements are disclosed employing internal latent image silver halide emulsions associated with developer autoxidation promoter agents constituted by 5 or 6 membered nucleus-containing heterocyclic compounds comprising an azomethine group, whose methine group is substituted with a 5-amino-1,2,4-triazolyl group, and/or copper complex compounds thereof.Preferably said direct positive photographic elements are multi-layer elements comprising internal latent image type type silver halide emulsion layers sensitized to different regions of the visible light and associated with image-dye providing compounds (photographic color couplers).

Abstract: A heat-developable photosensitive material which contains a compound of the general formula: ##STR1## wherein F and F' each represents an atomic group necessary for the formation of a 5- or 6-membered rings which may have condensed rings; n represents an integer of 0 or 1; R.sup.1 and R.sup.2 which may be the same or different, each represents a hydrogen atom, a halogen atom, a hydroxyl group, a cyano group, or a substituted or unsubstituted alkyl group, cycloalkyl group, alkenyl group, alkynyl group, aryl group, heterocyclic residual group, aralkyl group, alkoxy group, aryloxy group, acylamino group, acyloxy group, acyl group, carbamoyl group, sulfamoyl group, sulfamoylamino group, ureido group, alkylsulfonyl group, arylsulfonyl group, alkylsulfonylamino group, arylsulfonylamino group, alkoxycarbonyl group or alkoxycarbonylamino group, or --CO.sub.2 M; and R.sup.1 and R.sup.2 may be combine and form a ring, M is an alkali metal or H.

Abstract: A negative working photographic element is disclosed capable of producing a high contrast silver image. The photographic element is comprised of surface latent image forming monodispersed silver halide grains having a mean diameter of less than 0.7 .mu.m, a contrast enhancing arylhydrazide, and, in an amount sufficient to stabilize sensitivity, a carboxyalkyl substituted 3H-thiazoline-2-thione.

Abstract: In the presence of a novel antifoggant represented by the general formula (I), a silver halide photographic material which has at least one light-sensitive silver halide emulsion layer on a support is development-processed. The developing solution is one containing both dihydroxybenzenes and 3-pyrazolidones, a developing solution containing both dihydroxybenzenes and aminophenoles, or a developing solution containing a primary aromatic amine developer to suppress markedly fog generation at much reduced sacrifice of sensitivity: ##STR1## wherein M represents a hydrogen atom, an alkali metal atom, NH.sub.4 or a mercapto group-protecting moiety which can be split-off in the presence of an alkali; n represents 1, 2 or 3; R.sup.1 represents a hydrogen atom or --COOR.sup.2 ; and R.sup.2 represents a hydrogen atom, an alkali metal atom, NH.sub.4, or an unsubstituted or substituted alkyl, aryl or aralkyl group.

Abstract: Photoimaging compositions comprising (a) substituted dibromoethane as defined, e.g., 1,2-dibromotetrachloroethane, 1,2-dibromo-1,1-dichloroethane, etc. and (b) leuco dye. Photoimaging photopolymerizable compositions consist essentially of (a) substituted 1,2-dibromoethane as defined, (b) leuco dye, (c) at least one ethylenically unsaturated compound, (d) photoinitiator taken from the group consisting of -4-trichloromethyl-4-methyl-2,5-cyclohexadienones, benzophenones, alkylaryl ketones, and mixtures thereof; and optionally (e) at least one organic polymeric binder. The compositions are useful to provide a printout image and in admixture with a variety of initiators or initiator systems and ethylenically unsaturated compounds provide photopolymerizable compositions having good printout images.

Abstract: A recording medium and an image recording process in which a change in enzyme activity by light irradiation is utilized.

Abstract: New hydroquinone ether compounds of formula I are described: ##STR1## wherein p is 1 or 2 and q is 0 or 1, provided that p+q is 1 or 2, R is a residue of formula II ##STR2## and R.sub.o, R.sub.oo, R.sub.1, R.sub.2, R.sub.3, Q, n and k are as defined in the specification.The new compounds are useful e.g. as stabilizers in photographic material.

Abstract: An internal latent image-type direct positive silver halide light-sensitive material is described, comprising a support having at least one photographic emulsion layer thereon, wherein said layer contains internal latent image-type direct positive silver halide grains, the surfaces of which are chemically sensitized, wherein a compound of the general formula (I) is added as a finish additive to the photographic emulsion layer or at least one hydrophilic colloid layer adjacent to the photographic emulsion layer.General Formula (I): ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are defined as herein. The light-sensitive material exhibits a very satisfactory reversal performance and is greatly improved in stability over the course of time.

Abstract: A silver halide color photographic light-sensitive material comprising a support having thereon a silver halide emulsion layer and a compound represented by the following general formula (I): ##STR1## wherein COUP represents a coupler residue capable of being subjected to a coupling reaction with an oxidation product of an aromatic primary amine developing agent; TIME represents a timing group which is released upon the coupling reaction and subsequently releases ##STR2## Z represents a monocyclic or condensed heterocyclic ring consisting of a nitrogen atom and a carbon atom; L represents a divalent linking group; R.sup.1 represents a hydrogen atom or an alkoxycarbonyl group; R.sup.2 represents a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, an acyl group, a sulfonyl group, an alkoxycarbonyl group, a carbamoyl group, a sulfamoyl group, a thioacyl group or a thiocarbamoyl group; R.sup.3 represents a hydrogen atom; R.sup.2 and R.sup.

Abstract: A heat developable light-sensitive material is described, comprising a support having thereon a light-sensitive silver halide emulsion, a base or a base precursor, and a compound containing a group bonded to a carbon atom is represented by formula (I) ##STR1## wherein R.sup.2 represents an aryl group, a substituted aryl group, a heterocyclic group or a group represented by formula (A), (B), or (C) ##STR2## wherein R.sup.11 through R.sup.16 each represents an alkyl group, a substituted alkyl group, an aryl group, or a substituted aryl group.

Abstract: A color reversal photographic light-sensitive material is described having at least one light-sensitive silver halide emulsion layer, wherein at least one of said emulsion layer and a layer adjacent thereto contains a silver halide emulsion of silver halide grains containing internal fog centers.

Abstract: The present invention provides an optical information recording medium comprising, on a substrate, a recording layer consisting essentially of a double salt of an organic dye cation and a metal complex anion or a recording layer consisting essentially of said double salt and an organic dye.

Abstract: A silver halide photographic light-sensitive material is described, comprising at least one light-sensitive silver halide emulsion layer on a support, wherein the emulsion in said light-sensitive silver halide emulsion layer comprises a silver iodobromide emulsion containing 3 mol % or more of iodide, and at least one of said light-sensitive emulsion layer or another hydrophilic colloid layer contains a polyoxyethylene type surface active agent and at least one of said light-sensitive emulsion layer or another hydrophilic colloid layer contains a meso-ionic triazolium compound represented by formula (I) ##STR1## wherein X represents a sulfur ion or --N--R.sup.4, and R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each represents a hydrogen atom or a substituted or nonsubstituted alkyl group, aryl group, or heterocyclic group, or R.sup.1 and R.sup.2, R.sup.2 and R.sup.3 or R.sup.3 and R.sup.4 can together form a heterocyclic ring.

Abstract: An improved method of developing silver halide photographic light-sensitive materials comprising at least one silver halide emulsion layer on a support is disclosed. In the improvement, said silver halide emulsion layer contains core/shell type silver halide grains having a shell thickness of 25 to 150 .ANG. wherein the surface of the core is subjected to chemical sensitization treatment and the surface of the shell is not subjected to chemical sensitization, and a developing solution contains a solvent for silver halide. It is possible to carry out spectral sensitization without causing a reduction in intrinsic sensitivity and to provide high-speed silver halide light-sensitive materials which are excellent in anti-fading property of latent images and excellent in stabilization with the passage of time using the above-described improved method.