Abstract: Direct positive photographic films are disclosed having novel density enhancers of the formula ##STR1## wherein A is oxygen or sulfur, and B is selected from the group consisting of hydrogen, alkyl haloalkyl, hydroxyalkyl, alkylamino and alkoxy. Photographic materials coated with emulsions having these density enhancers display good optical density while maintaining high speed capability.

Abstract: Photographic silver halide emulsions are disclosed comprised of radiation sensitive silver halide grains containing greater than 50 mole percent chloride and less than 5 mole percent iodide, based on total silver, with any residual halide being bromide, said grains exhibiting a face centered cubic crystal lattice structure formed in the presence of a hexacoordination complex of rhenium, ruthenium, or osmium with at least four cyanide ligands. The emulsions exhibit increased sensitivity.

Abstract: Photographic emulsions are disclosed comprised of radiation sensitive silver bromide grains optionally containing iodide. The grains exhibit a face centered cubic crystal lattice structure and are formed in the presence of a hexacoordination complex of rhenium, ruthenium, or osmium with at least four cyanide ligands.

Abstract: There is provided a silver halide photographic material wherein a hydrophilic colloid layer is dyed with a new water-soluble dye that will not adversely affect the photographic characteristics of the silver halide emulsion layer. The silver halide photographic material exhibits excellent performance in that the dye is photochemically inactive such that not allow the sensitivity to lower, the latent image to fade, or the image to fog, and the decoloring or dissolving of the dye proceed rapidly in a photographic processing step, leaving no detrimental color on the processed photographic material.

Abstract: Photographic silver halide emulsions are disclosed comprised of radiation sensitive silver halide grains exhibiting a face centered cubic crystal lattice structure internally containing a nitrosyl or thionitrosyl coordination ligand and a transition metal chosen from groups 5 to 10 inclusive of the periodic table of elements.

Abstract: A direct positive silver halide light-sensitive color photographic material comprising, on a support, (1) at least three light-sensitive silver halide emulsion layers containing internal latent image-type light-sensitive silver halide grains, (2) specific sensitizing dyes having formulas [I], [II] and [III], respectively defined in the specification, and (3) at least one anti-irradiation compound selected from the group consisting of those compounds having formulas [IV], [V] and [VI], respectively defined in the specification, is disclosed.

Abstract: A method for forming a direct positive color image by subjecting an inner latent image type light-sensitive silver halide color photographic material for formation of a direct positive color image, having at least one light-sensitive emulsion layer containing inner latent image type silver halide grains which have not been previously fogged on the grain surfaces to color developing processing after image exposure, which comprises developing an inner latent image type light-sensitive silver halide color photographic material for formation of a direct positive color image wherein a silver halide emulsion in at least one light-sensitive emulsion layer consists substantially of a silver chlorobromide emulsion with the use of a color developing solution containing an N-hydroxyalkyl-substituted-p-phenylenediamine derivative at 30.degree. C. or higher for not longer than 150 seconds.

Abstract: UV-sensitive direct positive silver halide photographic elements for duplicating processes which can be safely handled under white light, said elements comprising a support base, a hydrophilic colloidal silver halide emulsion layer comprising fogged silver halide grains, and one or more hydrophilic colloidal layers, wherein said silver halide emulsion is reactively associated with a water-removable UV-absorbing compound having at least 80% of the absorption in the range from 350 to 400 .mu.m.

Abstract: A process for manufacturing a silver halide direct positive type emulsion comprising primarily silver bromide prepared in the presence of a water-soluble rhodium salt said process comprising; simultaneously adding and mixing a silver aqueous solution and a halide aqueous solution to form an aqueous solution containing a hydrophilic colloid, said resultant mixture having a silver potential maintained with a range of from 100 mV to 200 mV, the speed at which the solutions are added being not more than the critical growth speed of existing silver halide grains, and fogging said silver halide grains.

Abstract: There is disclosed a light-sensitive silver halide photographic material having at least one silver halide emulsion layer on a support, which comprises the light-sensitive photographic material contains light-sensitive silver halide grains, metal salt grains having internal fog and a polyhydric alcohol having at least two hydroxyl groups having a melting point of 40.degree. C. or higher.

Abstract: A fogged direct positive photographic silver halide emulsion containing a sensitizing amount of at least one cyanine dye defined above, e.g., cyanine dye containing a 1-phenylindole nucleus substituted in the 2-position with the 3-pyridyl group. The said cyanine dye is also covered. The dye useful in sensitizing the silver halide emulsion useful for fogged direct-positive films.

Abstract: A photographic silver halide emulsion is disclosed comprised of radiation sensitive silver halide grains exhibiting a face centered cubic crystal lattice structure and internally containing rhenium ions.

Abstract: A method for manufacturing a silver halide emulsion comprising the steps of forming silver halide grains in the presence of a hydrophilic colloid, physical ripening, desalting, and chemical ripening, wherein a photographic spectral sensitizing dye is added to the emulsion after adding at least 85% by weight of a soluble silver salt solution but before the desalting step is described.

Abstract: A direct positive silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer comprising a prefogged direct-positive silver halide emulsion, preferably one having a chloride content of at least 70 mol%, said emulsion layer or a hydrophilic colloid layer adjacent to said emulsion layer containing at least one compound represented by the following general formula (I) and, optionally, a specified organic desensitizer, ##STR1## wherein Z.sub.

Abstract: A new group of cyanine and merocyanine spectral sensitizing dyes based on derivatives of 3-indolizine carboxaldehyde is particularly useful in sensitizing a direct positive silver halide emulsion to orange and red.

Abstract: A new group of cyanine and merocyanine spectral sensitizing dyes based on derivatives of 3-indolizine carboxaldehyde is particularly useful in sensitizing a direct positive silver halide emulsion to orange and red.

Abstract: There is provided a high speed and high contrast direct positive silver halide photographic emulsion which is free of discoloration by containing therein a dimethine dye having an indolenine ring which contains a cyano group as a substituent.

Abstract: A process is disclosed of producing photographically useful radiation sensitive silver halide emulsions the grains of which are of a predetermined size distribution, including selection of maximum and minimum grain diameters and selection of the distribution of grains of maximum, minimum, and intervening diameters. This is achieved by modifying a double jet precipitation to introduce during the run stable silver halide grains capable of acting as host grains for the deposition of additional silver and halide ions. The degree to which the host grains initially introduced are grown determines the maximum grain diameter of the emulsion. The minimum diameter of the grains in the emulsion produced can be determined by the diameter of the stable silver halide grains introduced at the end of the run. The rate at which the stable host grains are introduced during the run controls the distribution of intervening grain sizes.

Abstract: A direct positive silver halide material is disclosed. The material is comprised of a support base having a silver halide emulsion layer thereon which contains at least one phenazine series compound represented by the general formula (I), (II) or (III) and at least one compound represented by the general formula (IV), (V) or (VI). The structural formulae are shown within the specification wherein their substituents are defined. By including one compound of each of these groups within the material the resulting material provides images with a reduced minimum density without reducing the contrast of the images formed.

Abstract: A silver halide photographic light-sensitive material which comprises a light-sensitive silver halide emulsion layer having associated therewith a blocked photographic agent, said blocked photographic agent being represented by the following general formula (I): ##STR1## wherein A represents a photographic agent moiety which is attached to a blocking moiety through a hetero atom; Z represents a divalent linkage group; p represents 0 or 1; X and Y each represents a substituent: m represents an integer of 0 to 4: and n represents an integer of 0 to 5.

Abstract: Novel silver halide crystals useful for both negative and positive photographic elements are produced by balanced double jet precipitation. Using that process, silver halide adds preferentially to the (111) surfaces of tetradecahedral silver bromide or iodobromide crystals to form cubic crystals which have corners containing a different silver halide from that in the lateral surfaces. In a specific embodiment, a crystal has corners composed of silver bromochloride, while the crystal substrate consists of highly photosensitive silver iodobromide.

Abstract: Direct positive silver halide photographic materials comprising a support, a silver halide emulsion layer comprising fogged silver halide particles prepared in the presence of a water soluble iridium salt or a water soluble rhodium salt, and a hydrophilic colloidal layer comprising (a) a compound selected from Formula I and II and (b) at least one compound selected from the group consisting of Formula III and a gold compound, said Formula I being ##STR1## wherein R.sub.1 is hydrogen, alkyl, --SO.sub.3 M, or --COOM, wherein M is selected from hydrogen, alkali metals, and ammonium, and R.sub.2 is selected from hydrogen and lower alkyls, said Formula II being ##STR2## wherein R.sub.3 is selected from hydrogen, alkyl, --SO.sub.3 M, and --COOM, and R.sub.4 is selected from hydrogen, alkyl, and --CH.sub.2 --S--(CH.sub.2).sub.n --Y', wherein n is an integer of from 1 to 3, and Y' is selected from hydrogen and --SO.sub.3 M, and said Formula III beingH.sub.2 N--Y--NH--Y].sub.m NH.sub.

Abstract: A redox release compound that is capable upon oxidation of releasing a silver ion complexing heterocyclic thio moiety enables reduction of the concentration of silver required in a photographic silver halide material comprising a combination of (i) photographic silver halide capable of forming a surface latent image, and (ii) a photographic silver halide capable of forming an internal latent image. The silver halide capable of forming an internal latent image preferably has lower photosensitivity than the silver halide capable of forming a surface latent image. The redox release compound preferably comprises a silver ion complexing 1,2,4-triazolium-3-thio moiety. An image is developed in such an exposed photographic silver halide element by means of a surface type silver halide developer.

Abstract: A method for obtaining direct positive images wherein a photographic material having a support and at least two silver halide emulsion layers coated thereon, each layer having a different spectral sensitivity, said emulsions being of the internal latent image type and containing unfogged silver halide crystals, is imagewise exposed and then subjected to an overall area exposure prior to or during the development thereof to form the image. The overall area exposure is such that the photographic intensity ratios between various layers are not more than 6 and the intensity of such overall exposure has a value between light intensities which give 0.8 times the maximum image density of the particular emulsion layer and 10 times that light intensity value.

Abstract: A method of rapidly processing a silver halide photographic light-sensitive material having high sensitivity and high covering power using a developing solution is disclosed. The developing solution contains a combination of a silver halide solvent and a particular anti-foggant. The rapid processing is not attended by increase in fog and deterioration of graininess. The photographic material contains a surface latent image type silver halide emulsion and a silver halide emulsion having fogged nuclei inside the grains in a single layer formed by coating the mixture thereof, or in a double layer formed by coating them separately. The anti-foggant has the general formula (I) or (II): ##STR1## wherein R.sub.1 represents hydrogen, a nitro group, a cyano group or a halogen atom; and R.sub.2 represents hydrogen, a halogen atom or an alkyl group.

Abstract: A high contrast, chemically fogged direct positive type silver halide photosensitive material is described containing at least one ammine complex salt selected from those including cobalt, nickel, ruthenium or chromium, by which the contrast in the lower optical density region is improved while retaining superior Dmax and sensitivity.

Abstract: A direct positive emulsion is produced by nonuniform fogging. The latter is conducted by varying the addition of the emulsion to fogging agent or by variable quenching of the fogging reaction. Films using such emulsion have extended exposure latitude or long scale, and the Density vs. Log Exposure curve is smooth and continuous.

Abstract: Direct-positive photographic material having at least one layer which contains a silver halide emulsion surface-fogged by chemical means or by exposure and a tri-nuclear cyanine dye, which has the formula ##EQU1## in which A.sub.1 is .dbd.CH-- or .dbd.CH--CH.dbd.CH--, Z.sub.1 is a monocyclic or polycyclic heterocyclic radical which is linked by a double bond to the adjacent methine group, Z.sup..sym. is a positively charged radical which is mesomeric to Z.sub.1 and is linked by a single bond to the adjacent methine group, Z.sub.2 --is a nitrogen-heterocyclic radical which has its single positive charge on the nitrogen atom and Z.sub.3 .dbd. is a radical which has no charge on the nitrogen atom and is mesomeric to Z.sub.2, at least one of the radicals Z.sub.

Abstract: A direct positive emulsion is produced by nonuniform fogging. The latter is conducted by varying the addition of the emulsion to fogging agent or by variable quenching of the fogging reaction. Films using such emulsion have extended exposure latitude or long scale, and the Density vs. Log Exposure curve is smooth and continuous.

Abstract: Direct positive photographic elements with improved spectral sensitivity in the green and red portion of the visible spectrum are obtained from emulsions containing a supersensitizing amount of a spectral sensitizing dye (a) having a solution absorption maximum less than 495 nm and the lowest vacant energy band less than -3.7 eV, and a sensitizing amount of a spectral sensitizing dye (b) having a lowest vacant energy band between -3.7 eV and 0.3 eV below the lowest vacant energy band of said spectral sensitizing dye (a) and with the highest occupied energy band between -5.9 eV and 0.3 eV above the highest occupied energy level of dye (a).

Abstract: Direct-positive photographic material which has at least one layer which contains a silver halide emulsion surface-fogged by chemical means or by exposure and, as a sensitizer, a trinuclear tetramethinecyanine dye in which all or some of the methine hydrogen atoms have been replaced by fluorine, chlorine, bromine or iodine atoms. The novel trinuclear tetramethinecyanine dyes impart an excellent blue-sensitivity to the photographic materials. Furthermore, high maximum densities and very low minimum densities are achieved.

Abstract: Direct positive silver halide emulsions are provided which contain fogged silver halide grains the said grains being heterodisperse and containing silver iodide in an amount of more than 10 mole % and at most 20 mole % relative to the total amount of silver halide. The emulsions have increased sensitivity and reduced gradation which is suitable for continuous tone reproduction.

Abstract: A silver halide photographic emulsion containing silver halide grains formed in the presence of a silver halide solvent of the formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each a subtituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group (e.g., allyl group), a substituted or unsubstituted aryl group or a substituted or unsubstituted nitrogen-containing heterocyclic ring; or R.sub.1 and R.sub.2, R.sub.2 and R.sub.3, and R.sub.3 and R.sub.4 when taken together may form a 5- or 6-membered heterocyclic ring; provided at least one of R.sub. to R.sub.4 is a 5- or 6-membered nitrogen-containing heterocyclic ring, an alkyl group or aryl group substituted with an amino group, an alkyl grop substituted with a nitrogen-containing heterocyclic ring, or R.sub.1 and R.sub.2, R.sub.2 and R.sub.3, or R.sub.3 and R.sub.4 combine to form a 5- or 6-membered nitrogen-containing heterocyclic ring containing at least two nitrogen atoms.

Abstract: Direct-positive silver halide photographic sensitive materials of high sensitivity and capable of forming a high-contrast image are obtained by incorporating anion-type cyanine dyes having a polarographic oxidation halfwave potential not less positive than +0.4 V in externally fogged direct-positive silver halide emulsions containing not less than 70 mole-% of bromide. Additional incorporation of a development accelerator such as 2-mercaptoimidazoline improves developability.

Abstract: Novel photographic imaging process and materials suitable therefor are provided, which can find their application in multi-color motion picture and simultaneous sound recording, in direct-positive image formation, in image-intensification processes, etc. A photographic silver image is formed in at least one hydrophilic colloid layer of a light-sensitive photographic material incorporating silver halide, by means of exposure and alkaline development steps, followed by bleaching of quantities of silver which are present in areas of said layer extraneous to those where imaging silver is required.

Abstract: A high-contrast direct positive prefogged silver halide emulsion free from coror stain, which contains at least one new dimethinecyanine dye wherein the 3-position of a pyrazolo[1,5-a]pyridine nucleus is bonded through a dimethine chain to the 1-, 2-, 3- or 4-position of a cyanine hetero ring nucleus, provided that where the bonding is in the 4-position said cyanine nucleus is a quinoline nucleus or a pyridine nucleus and where the bonding is in the 1- or 3-position said cyanine nucleus is an isoquinoline nucleus, said dimethyinecyanine dye being present in an amount sufficient to sensitize said emulsion.

Abstract: A silver halide emulsion which is useful in photography is described. The silver halide grains are characterized by uniform and increased grain size and uniform crystal habit when a compound containing the .dbd.N--C(.dbd.S)--N.dbd. moiety is present during the formation of the grains in the precipitation and/or the ripening steps.

Abstract: A covering power, heat developable photographic material comprising, in binder, and in reactive association (a) negative-working photosensitive silver halide, (b) an image-forming combination comprising (i) an organic silver salt oxidizing agent containing a heterocyclic thione ligand or 1,2,4-mercaptotriazole ligand with (ii) an organic reducing agent and (c) a nucleating concentration of a hydrazino thiourea nucleating agent, enables a positive image to be developed and, in most cases, stabilized even though the photothermographic material contains no separate post-processing image stabilizer. The heat developable silver halide photographic material also enables development efficiency that is better than in those photothermographic silver halide materials not based on covering power imaging. A positive image can be developed in the heat developable photographic material after imagewise exposure by merely heating the material to moderately elevated temperatures.