Abstract: The present invention provides a heat-developable photographic light-sensitive material which can give a high contrast image. A novel heat-developable photographic light-sensitive material is provided, comprising at least one compound represented by formula (I): ##STR1## wherein Z represents a non-metallic atom group necessary for the formation of a nitrogen-containing heterocyclic group.

Abstract: 2-Substituted malondialdehyde compounds are useful as co-developers in combination with hindered phenol developers to produce high contrast black-and-white photothermographic and thermographic elements.The photothermographic and thermographic elements may be used as a photomask in a process where there is a subsequent exposure of an ultraviolet or short wavelength visible radiation-sensitive imageable medium.

Abstract: Heat bleachable elements have antihalation layers composed of metallized or unmetallized formazan dyes, hexaarylbiimidzoles having alkoxy substituents and film forming binders that soften upon heating. These layers are rapidly bleached at relatively low temperatures. Polymeric acidic layers adjacent the antihalation layers provide an acidic component that increases bleaching rates when the acidic layer is also softened during processing.

Abstract: Hydrogen atom donor compounds are useful as contrast enhancers when used in combination with (i) hindered phenol developers, and (ii) trityl hydrazide and/or formyl-phenyl hydrazine co-developers, to produce ultra-high contrast black-and-white photothermographic and thermographic elements.The photothermographic and thermographic elements may be used as a photomask in a process where there is a subsequent exposure of an ultraviolet or short wavelength visible radiation-sensitive imageable medium.

Abstract: A heat-sensitive recording material suited for use in direct thermal imaging and having image-stabilization properties which material contains in a binder on a support (i) a substantially light-insensitive organic silver salt capable of thermally activated reduction to silver in thermal working relationship with (ii) at least one reducing agent capable of reducing the substantially light-insensitive organic silver salt when thermally activated, characterized in that the recording material contains in conjunction, preferably in admixture, with the reducing agent(s) at least one colourless photo-oxidizing substance that on exposure to ultraviolet (UV) radiation, such as present in daylight or artificial lighting, yields free radicals capable of inactivating said reducing agent(s) by oxidation, thereby rendering said reducing agent(s) incapable of reducing said organic silver salt to silver.

Abstract: Nitrogen containing 3-heteroaromatic substituted acrylonitrile compounds are useful as co-developers in combination with hindered phenol developers to produce high contrast black-and-white photothermographic and thermographic elements.The photothermographic and thermographic elements may be used as a photomask in a process where there is a subsequent exposure of an ultraviolet or short wavelength visible radiation-sensitive imageable medium.

Abstract: A method for processing a silver halide photographic light-sensitive material by an automatic processor is disclosed. The processing method comprises the steps of (1) developing a silver halide photographic light-sensitive material with a developer being in a developing tank of said automatic processor while replenishing a developer replenisher in a rate of from 50 ml to 330 ml per square meter of the light-sensitive material processed and (2) fixing said developed silver halide photographic light-sensitive material with a fixer being in a fixing tank of said automatic processor while replenishing a fixer replenisher in a rate of from 50 ml to 330 ml per square meter of the light-sensitive material. The light-sensitive material comprises a support and at least one silver halide emulsion layer provided on a surface of a support which is a stretched film composed of a styrene copolymer having a syndiotactic structure or a composition containing said styrene copolymer.

Abstract: A heat-developable photographic material having a light-sensitive silver halide, a reducing agent, a binder and a dye-donating compound on a support, in which at least one light-sensitive silver halide emulsion on the support contains from 1.times.10.sup.-7 to 1.times.10.sup.-3 mol, per mol of silver halide, of iron ions in the silver halide grains. The material shows little sensitivity fluctuation to variations of the temperature of exposure and shows little decrease in sensitivity on exposure with high intensity light for a short period of time, such as laser rays.

Abstract: Toning agents are provided for use in thermographic and photothermographic materials, either on their own or in combination with at least one other toning agent, with improved compatibility with hydrophobic media as shown by reduced crystallization and reduced diffusion through the material, which properties enabling an improved imaging performance to be achieved and in particular a more neutral image tone after storage.

Abstract: A recording material comprising on a support (i) a heat sensitive layer comprising a substantially light insensitive organic silver salt, (ii) a protective layer containing a thermomeltable particle dispersed in a binder and (iii) a reducing agent being present in the heat sensitive layer and/or any other layer of the recording material on the same side of the support carrying the heat sensitive layer.

Abstract: There are described heat-developable photosensitive image-recording materials which include a compound having at least one cyclic 1,3-sulfur-oxygen moiety. The compound is stable in the photographic processing composition but capable of undergoing cleavage in the presence of an imagewise distribution of silver ions and/or soluble silver complex made available as a function of development to liberate a reagent in an imagewise distribution corresponding to that of the silver ion and/or the soluble silver complex. The reagent includes a photographically useful group such as a complete dye or dye intermediate.

Abstract: A negative-acting photothermographic element comprising a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer comprising:(a) an iridium doped, preferably iridium-doped core-shell, photosensitive silver halide grains, generally containing a total silver iodide content of less than 10 mole %, the shell having a second silver iodide content lower than the silver iodide content of the core;(b) a non-photosensitive, reducible source of silver;(c) a reducing agent for the non-photosensitive, reducible source of silver;(d) a binder; and(e) optionally at least one compound selected from the group consisting of: a halogen molecule; an organic haloamide; and hydrobromic acid salts of nitrogen-containing heterocyclic compounds which are further associated with a pair of bromine atoms.A process of forming photothermographic emulsions from iridium-doped silver halide grains by forming silver soaps in the presence of those grains is also described.

Abstract: N-acyl-hydrazine compounds are useful as contrast enhancers when used in combination with (i) hindered phenol developers, and (ii) trityl hydrazide and/or formyl-phenyl hydrazine co-developers, to produce ultra-high contrast black-and-white photothermographic and thermographic elements.The photothermographic and thermographic elements may be used as a photomask in a process where there is a subsequent exposure of an ultraviolet or short wavelength visible radiation-sensitive imageable medium.

Abstract: A heat-sensitive recording material suited for use in direct thermal imaging by means of an information-wise energized heating element, which recording material comprises on the same side of a support, called the heat-sensitive side, one or more binder layers containing a substantially light-insensitive metal salt in thermal working relationship with at least one organic reducing agent, characterized in that said recording material also comprises an acid-sensitive leuco dye transformable into dye by means of an acid-reacting compound serving as dye developer that stands in thermal working relationship with said leuco dye.

Abstract: The present invention provides a recording material comprising on a support (i) a heat sensitive layer comprising a substantially light insensitive organic silver salt, (ii) a protective layer containing calcined China clay dispersed in a binder and (iii) a reducing agent being present in the heat sensitive layer and/or another layer on the same side of the support carrying the heat sensitive layer. The present invention further provides a method for making images therewith. The obtained images may be used in medical diagnostics.

Abstract: A dry process silver salt photosensitive material has a support and provided thereon a photosensitive layer containing at least an organic silver salt, a reducing agent and a photosensitive silver halide or a photosensitive silver halide forming component. The photosensitive layer is incorporated with a compound selected from the compounds (i), (ii) and (iii).

Abstract: Hydroxamic acid compounds are useful as contrast enhancers when used in combination with (i) hindered phenol developers, and (ii) trityl hydrazide and/or formyl-phenyl hydrazine co-developers, to produce ultra-high contrast black-and-white photothermographic and thermographic elements.The photothermographic and thermographic elements may be used as a photomask in a process where there is a subsequent exposure of an ultraviolet or short wavelength visible radiation-sensitive imageable medium.

Abstract: Hydroxylamine, alkanolamine, and ammonium phthalamate compounds are useful as contrast enhancers when used in combination with (i) hindered phenol developers, and (ii) trityl hydrazide and/or formyl-phenyl hydrazine co-developers, to produce ultra-high contrast black-and-white photothermographic and thermographic elements.The photothermographic and thermographic elements may be used as a photomask in a process where there is a subsequent exposure of an ultraviolet or short wavelength visible radiation-sensitive imageable medium.

Abstract: Acrylonitrile compounds are useful as co-developers when used in combination with hindered phenol developers to produce high contrast black-and-white photothermographic and thermographic elements.Acrylonitrile compounds are also useful as co-developers when used in combination with (i) hindered phenol developers, and (ii) trityl hydrazide and/or formyl-phenyl hydrazinc co-developers, to produce ultra-high contrast black-and-white photothermographic and thermographic elements.The photothermographic and thermographic elements may be used as a photomask in a process where there is a subsequent exposure of an ultraviolet or short wavelength visible radiation-sensitive imageable medium.

Abstract: A dry process silver salt photosensitive material is disclosed which has a support and a photosensitive layer. The photosensitive layer contains at least a photosensitive silver halide or photosensitive silver halide forming component, an organic silver salt and a pyrrole compound. The photosensitive material has a broad latitude for heat development and can form images with a high contrast.

Abstract: Heat-developable silver-based photosensitive imaging element comprising a heat-reducible organic silver salt, a photosensitive silver halide, a developing agent, and a releasing compound that upon reaction with either the reduced or the oxidized form of the developing agent is capable of releasing a hydrophobizing agent. The invention also relates to a method for producing a lithographic printing plate comprising image-wise exposing an imaging element, bringing the exposed element in face-to-face contact with an oleophobic surface of a printing plate precursor, heating the imaging element while in contact or before being brought in contact with the oleophobic surface to cause reduction of the organic silver salt and to cause the release of the hydrophobizing agent from the releasing compound, allowing the hydrophobizing agent to diffuse to the oleophobic surface to render the surface image-wise oleophilic, and separating the resulting lithographic printing plate from the imaging element.

Abstract: A heat developing photosensitive material of the present invention has, on a substrate, a photosensitive layer containing at least an organic silver salt, a reducing agent, a photosensitive silver halide or a photosensitive silver halide forming agent, a cyanine dye and a cyclic carbonyl compound.In an image forming method of the present invention, an image is exposed on the heat developing photosensitive material and then the exposed photosensitive material is heated.

Abstract: The present invention provides heat-developable, photothermographic elements comprising a support bearing at least one photosensitive, image-forming layer comprising:(a) a photosensitive silver halide;(b) a non-photosensitive, reducible silver source;(c) a reducing agent for silver ions;(d) a binder; and(e) a spectrally sensitizing amount of a compound having the central nucleus: ##STR1## wherein: Z is S, O, Se or N--R.sup.3 ;R.sup.1 and R.sup.2 represent an alkyl group of from 1 to 20 carbon atoms other than carboxy-substituted alkyl, preferably an alkyl group of from 1 to 8 carbon atoms, and most preferably an ethyl group; andR.sup.3 is H or alkyl group;X and Y are thioalkyl groups of from 1 to 20 carbon atoms;n=0 to 4;m=0 to 4; the sum of n plus m equals at least 1;D.sup.1 to D.sup.7 each independently represents a methine group and adjacent methine groups selected from D.sup.2, D.sup.3, D.sup.4, D.sup.5 and D.sup.6 may form cyclic groups;p=0 or 1; andA.sup.- is an anion.

Abstract: The present invention provides a recording material comprising on a support (i) a heat sensitive layer comprising a substantially light insensitive organic silver salt, (ii) a protective layer containing a matting agent dispersed in a binder and (iii) a reducing agent being present in the heat sensitive layer and/or another layer on the same side of the support carrying the heat sensitive layer. The present invention further provides a method for making images therewith. The obtained images may be used in medical diagnostics.

Abstract: Trityl hydrazides and formyl-phenyl hydrazines are useful as co-developers with hindered phenols in phothothermographic and thermographic elements. These co-developers have the formula:R.sup.1 --(C.dbd.O).sub.n --NHNH--R.sup.2R.sup.1 represents hydrogen and R.sup.2 represents an aryl or substituted aryl group; or,R.sup.1 represents hydrogen, alkyl and alkenyl groups of up to 20 carbon atoms; alkoxy, thioalkoxy, or amido groups of up to 20 carbon atoms; aryl, alkaryl, or aralkyl groups of up to 20 carbon atoms; aryloxy, thioaryloxy, or anilino groups of up to 20 carbon atoms; aliphatic or aromatic heterocyclic ring groups containing up to 6 ring atoms; carbocyclic ring groups comprising up to 6 ring carbon atoms; or fused ring or bridging groups comprising up to 14 ring atoms; and R.sup.2 represents a trityl group.

Abstract: Reduction of mottle and other surface anomalies in photothermographic and thermographic elements is reduced by the incorporation of a fluorinated polymer containing at least two different groups within the polymer chain derived from reactive monomers, the groups being: a fluorinated, ethylenically unsaturated monomer; and a polar, ethylenically unsaturated monomer.

Abstract: A heat-developable photosensitive material including a photosensitive layer formed on a support, the photosensitive layer at least containing an organic silver salt, a reducing agent, either a photosensitive silver halide or a photosensitive silver halide forming agent, and a sensitizing dye of the following general formula (I): ##STR1## where r is hydrogen, halogen, substituted or unsubstituted alkyl, substituted or unsubstituted alkoxyl, substituted or unsubstituted aryl or substituted amino; r.sup.1 and r.sup.2 are each substituted or unsubstituted aryl or r.sup.1 and r.sup.2 are bonded to each other to form a condensed ring; r.sup.3, r.sup.4 and r.sup.5 are each hydrogen, substituted or unsubstituted alkyl, alkenyl, substituted or unsubstituted aryl, or substituted or unsubstituted aralkyl; X.sup.1 is oxygen, sulfur, carbon, nitrogen or selenium, wherein when X.sup.1 is carbon or nitrogen, then X.sup.

Abstract: Ribonucleic acid (RNA) compounds have been found to function as antifoggants and post-processing print stabilizers in photothermographic elements.

Abstract: Sulfonyl hydrazides are used as developers in phothothermographic and thermographic elements. The sulfonyl hydrazides have the formula:R.sup.1 --CO--NHNH--SO.sub.2 --R.sup.2wherein R.sup.1 and R.sup.

Abstract: Improved photothermographic elements are spectrally sensitized with cyanine dyes that provide efficient sensitization together with excellent keeping stability and low dye stain. The photothermographic elements comprise a photosensitive silver halide, an organic silver salt, such as silver behenate, and a reducing agent. The cyanine dye utilized as a spectral sensitizer for the silver halide is an anionic cyanine dye comprising two thiazole nuclei each of which is substituted with an N-sulfoalkyl group wherein at least one of the thiazole nuclei is a 5,6-dihalobenzothiazole nucleus.

Abstract: Improved photothermographic elements are spectrally sensitized with a combination of cyanine dyes that provides efficient sensitization together with excellent keeping stability and low dye stain. The photothermographic elements comprise a photosensitive silver halide, an organic silver salt, such as silver behenate, and a reducing agent. The dye combination utilized as a spectral sensitizer for the silver halide is a combination of a first cyanine dye containing two thiazole nuclei and a second cyanine dye containing a thiazole nucleus and an oxazole nucleus.

Abstract: Trityl hydrazides and formyl-phenyl hydrazines are useful as co-developers with hindered phenols in phothothermographic and thermographic elements. These co-developers have the formula:R.sup.1 --(C.dbd.O).sub.n --NHNH--R.sup.2R.sup.1 represents hydrogen and R.sup.2 represents an aryl or substituted aryl group; or,R.sup.1 represents hydrogen, alkyl and alkenyl groups of up to 20 carbon atoms; alkoxy, thioalkoxy, or amido groups of up to 20 carbon atoms; aryl, alkaryl, or aralkyl groups of up to 20 carbon atoms; aryloxy, thioaryloxy, or anilino groups of up to 20 carbon atoms; aliphatic or aromatic heterocyclic ring groups containing up to 6 ring atoms; carbocyclic ring groups comprising up to 6 ring carbon atoms; or fused ring or bridging groups comprising up to 14 ring atoms; and R.sup.2 represents a trityl group.

Abstract: A photosensitive element having a photosensitive medium comprising silver halide in reactive association with an organoborate salt and wherein said medium is selected from:(a) silver halide photographic emulsions comprising a cationic dye, and(b) photothermographic media comprising in one or more layers a reducible silver source, a reducing agent for silver ion and an antifoggant.

Abstract: A photothermographic element comprising a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer comprising:(a) a photosensitive silver halide;(b) a non-photosensitive, reducible source of silver;(c) a chromogenic leuco dye reducing agent; and(d) a binder;wherein the chromogenic leuco dye reducing agent is a chromogenic leuco redox-dye-releasing compound of the general formula: ##STR1## wherein: (i) Cp is a coupler group;(ii) N--D is a photographic developer group; and(iii) R.sup.1 is a --C(O)--NH--A--Dye group wherein Dye represents the chromophore of a thermally mobile dye; and A represents a single bond or a divalent linking group of the formula --X--R.sup.5 --L--, wherein R.sup.5 is a divalent hydrocarbon chain containing up to 12 carbon atoms, L is a single bond or a divalent group that binds the chromophore of the thermally mobile dye to R.sup.5, and X represents a single bond or an --SO.sub.2 -- group.

Abstract: A photothermographic element comprising a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer comprising:(a) a photosensitive silver halide;(b) a non-photosensitive, reducible source of silver;(c) a reducing agent for the non-photosensitive reducible silver source; and(d) a binder;wherein the reducing agent is a hydrazide redox-dye-releasing compound of the general formulae: ##STR1## wherein: D represents the chromophore of a thermally mobile dye; X represents a single bond or a divalent linking group; R.sup.1 and R.sup.2 independently represent an organic group; and n.gtoreq.1.

Abstract: A photothermographic element containing a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer is provided. The emulsion layer comprises:(a) a photosensitive silver halide;(b) a non-photosensitive, reducible source of silver;(c) a leuco dye reducing agent; and(d) a binder;wherein the leuco dye reducing agent comprises a blocked leuco dye compound of the general formula L-R.sup.1, which is capable of being oxidized to a colored form, wherein:(i) L is a group remaining after removal of a hydrogen from a leuco dye; and(ii) R.sup.1 is a C(O)--NH--SO.sub.2 --R.sup.5 group wherein R.sup.5 is an aliphatic group or an aromatic group.

Abstract: Silver carboxylates which can serve as the silver source in a black-and-white thermographic or photothermographic element or as the oxidizing agent for a dye-based thermographic or photothermographic color-imaging construction can be represented by the general formula;R.sup.3 --X--(CH.sub.2 --CH.sub.2 --X).sub.n --L--CR.sup.1 R.sup.2 --COO.sup.-+ Agwherein:R.sup.1 and R.sup.2 are each independently hydrogen, halogen, alkyl, substituted alkyl, aromatic, or substituted aromatic;R.sup.3 is an alkyl group, an aryl group, or L--CR.sup.1 R.sup.2 --COO.sup.-+ Ag;L is a linking group that links CR.sup.1 R.sup.2 to X;X is selected from the group consisting of O, S, and NR.sup.4, wherein R.sup.4 is chosen from alkyl, substituted alkyl, aromatic, or substituted aromatic; andn is an integer from 0 to 12.

Abstract: A heat developing photosensitive member including: a photosensitive layer containing at least an organic silver salt, a reducing agent and a photosensitive silver halide or a photosensitive silver halide forming agent; and a supporting member for supporting the photosensitive layer thereon, wherein merocyanine dye having a structure in which a thiazole nucleus or selenazole nucleus and hydantoin nucleus, thiohydantoin nucleus or selenohydantoin nucleus are combined with each other by a combining group having a methine group is contained in the photosensitive layer.

Abstract: An aqueous-developable chromogenic photographic heat-transferable non-aqueous dye-diffusion-transfer photographic element is disclosed, wherein said element comprises radiation sensitive silver halide, a dye-providing compound that forms or releases a heat-transferable image dye upon reaction of said compound with the oxidation product of a primary amine developing agent, a hydrophilic binder, and a thermal solvent for facilitating non-aqueous diffusion transfer according to formula (I) ##STR1## wherein AH is a hydrogen bond donating group with an aqueous pK.sub.a for proton loss of greater than 6;L.sup.1 and L.sup.

Abstract: An aqueous-developable chromogenic photographic heat-transferable non-aqueous dye-diffusion-transfer photographic element is disclosed, wherein said element comprises radiation sensitive silver halide, a dye-providing compound that forms or releases a heat-transferable image dye upon reaction of said compound with the oxidation product of a primary amine developing agent, a hydrophilic binder, and a thermal solvent for facilitating non-aqueous diffusion transfer according to formula (I) ##STR1## wherein AH is a hydrogen bond donating group with an aqueous pK.sub.a value for proton loss of greater than 6;L.sup.1 and L.sup.

Abstract: A photothermographic or thermographic imaging element having uniform optical density is described which is useful in automated equipment. A polymeric fluorinated surfactant is present in a layer adjacent to the photothermographic or thermographic emulsion layer to provide uniform optical density. Optically transparent polymeric beads are present in at least one outermost layer of the imaging element to assist in the separation and sliding of the elements when subjected to a film feeding mechanism in automated equipment.

Abstract: Sulfonyl hydrazides are used as developers in phothothermographic and thermographic elements. The sulfonyl hydrazides have the formula:R.sup.1 --CO--NHNH--SO.sub.2 --R.sup.2wherein R.sup.1 and R.sup.

Abstract: Post-processing stabilizers for photothermographic, silver imaging media are disclosed. The stabilizers are represented by the following general formulae: ##STR1## wherein: R.sup.1, R.sup.2, and R.sup.3 are independently H, halogen, an alkyl group, an alkoxy group, a thioalkyl group, a cycloalkyl group, a perhalogenated alkyl group, or taken together form a cycloaliphatic group.Compounds of formula (I) may be used as stabilizer precursors in photothermographic silver imaging media to provide post-processing stability without significantly adversely affecting desired properties of the photothermographic material.

Abstract: A compound having a nucleus of the formula: ##STR1## The compounds are suitable for use as image stabilizers and antifoggants in photothermographic materials and exhibit acceptably low sensitization of human skin.

Abstract: Heat-developable photographic recording materials comprising (a) at least one binder layer coated on a support, the binder layer containing at least one light-sensitive silver halide and a light-insensitive silver salt of a fatty acid; and in the binder layer or in another layer in reactive relationship to the binder layer (b) at least one reducing agent and (c) a stabilizer selected from the group of hexamethylene tetramine and salts thereof, triazaadamantane and salts thereof, and compounds that can be derived from hexamethylene tetramine by exchanging one or more --CH.sub.2 -- groups with --S--, --SO--, or --SO.sub.2 -- provide excellent stability during storage and can be manufactured easily and inexpensively and which presents minimal environmental or health risks.

Abstract: Photothermographic elements of the photothermographic type may be sensitized to the infrared with sensitizing dyes of the formula: ##STR1## wherein: R.sup.1 represents a (CH.sub.2).sub.n --COO.sup.- group of from 1-20 carbon atoms, or an alkyl group of from 1 to 20 carbon atoms; andn is an integer from 1 to 20.

Abstract: Photothermographic elements having improved post-processing stabilty are described. These elements comprise a support bearing at least one photosensitive, image-forming photothermographic-emulsion layer comprising:(a) a photosensitive silver halide;(b) a non-photosensitive, reducible silver source;(c) a reducing agent for said non-photosensitive, reducible silver source,(d) a binder; and(e) a compound capable of releasing a post-processing stabilizer having a nucleus of the formula: ##STR1## wherein: A represents any monovalent group for which the corresponding compound AH functions as a post-processing stabilizer.

Abstract: A process for forming an improved dye image in a heat-developable photographic dry dye-diffusion transfer element comprising the steps of:providing a heat-developable chromogenic photographic dry dye-diffusion transfer element comprising radiation sensitive silver halide, an organic silver salt, a heat-developable dye-forming compound wherein said compound forms or releases a heat-transferable dye upon reaction of said compound with the oxidation product of a reducing agent, a reducing agent, a hydrophilic binder, and a thermal solvent wherein said thermal solvent comprises a 3-hydroxy benzamide or a 4-hydroxy benzamide and has the structure I ##STR1## wherein (a) Z.sub.1, Z.sub.2, Z.sub.3, Z.sub.4, and Z.sub.5 are substituents, the Hammet sigma parameters of Z.sub.2, Z.sub.3, and Z.sub.4 sum to give a total, .SIGMA., of at least -0.28 and less than 1.

Abstract: A negative-acting photothermographic element comprising a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer comprising:(a) an iridium doped, preferably iridium-doped core-shell, photosensitive silver halide grains, generally containing a total silver iodide content of less than 10 mole %, the shell having a second silver iodide content lower than the silver iodide content of the core;(b) a non-photosensitive, reducible source of silver;(c) a reducing agent for the non-photosensitive, reducible source of silver;(d) a binder; and(e) optionally at least one compound selected from the group consisting of: a halogen molecule; an organic haloamide; and hydrobromic acid salts of nitrogen-containing heterocyclic compounds which are further associated with a pair of bromine atoms.A process of forming photothermographic emulsions from iridium-doped silver halide grains by forming silver soaps in the presence of those grains is also described.

Abstract: Photothermographic elements capable of producing a high density yellow or magenta image upon image-wise exposure and thermal development at a relatively low temperature and for a short period of time are described. The photothermographic elements of the invention comprise coated on a support base at least one light-sensitive emulsion layer comprising (a) a leuco dye reducing reducing agent, (b) a photosensitive silver halide, (c) an organic silver compound capable of being reduced by the leuco dye reducing agent, and (d) a binder; wherein the leuco dye reducing agent thereto comprises a chromogenic yellow or magenta leuco dye compound.The photothermographic elements of the invention may be used to obtain yellow and magenta images of suitable density in single color or multicolor photothermographic articles. At the same time the chromogenic leuco dye is stable enough not to be oxidized by oxygen of the air or by simple heating and to limit the fog formation after development.