Abstract: A process is disclosed of preparing a photographic emulsion containing tabular silver halide grains exhibiting a reduced degree of total grain dispersity. After forming a population of silver halide grain nuclei containing parallel twin planes, a portion of the silver halide grain nuclei are ripened out. The silver halide grain nuclei containing parallel twin planes remaining are then grown to form tabular silver halide grains. The total grain dispersity of the emulsion is reduced by incorporating bromide ion in the dispersing medium prior to forming the silver halide grain nuclei and, at the time parallel twin planes are formed in the silver halide grain nuclei, a grain dispersity reducing concentration of a polyalkylene oxide block copolymer surfactant is present comprised of two terminal lipophilic alkylene oxide block units linked by a hydrophilic alkylene oxide block unit accounting for at least 4 percent of the molecular weight of the copolymer.

Abstract: A process is disclosed of preparing a photographic emulsion containing tabular silver halide grains exhibiting a reduced degree of total grain dispersity. After forming a population of silver halide grain nuclei containing parallel twin planes, a portion of the silver halide grain nuclei are ripened out. The silver halide grain nuclei containing parallel twin planes remaining are then grown to form tabular silver halide grains. The total grain dispersity of the emulsion is reduced by incorporating bromide ion in the dispersing medium prior to forming the silver halide grain nuclei and, at the time parallel twin planes are formed in the silver halide grain nuclei, a polyalkylene oxide block copolymer surfactant containing at least three terminal lipophilic alkylene oxide block units each linked through a hydrophilic alkylene oxide block linking unit accounting for at least 4 percent of the molecular weight of the copolymer.

Abstract: A process of producing silver halide grains by disposing a mixer outside of a reaction vessel for causing a nucleus formation and/or a crystal growth of silver halide grains and containing an aqueous protective colloid solution. The process further includes the steps of: supplying an aqueous solution of a water-soluble silver salt, an aqueous solution of a water-soluble halide(s), and an aqueous solution of a protective colloid to the mixer while controlling the flow rates of the solutions; mixing them while controlling the rotational speed of a stirring blade of the mixer to form fine, silver halide grains; and immediately supplying the fine grains into the reaction vessel to perform the nucleus formation and/or the crystal growth of the silver halide grains in the reaction vessel. The silver halide fine grains thus formed in the mixer are quickly diluted with a liquid withdrawn from the reaction vessel and then the diluted mixture is supplied to the reaction vessel.

Abstract: There is described a process for the spectral sensitization of photographic silver halide emulsions which comprises forming and chemically sensitizing silver halide crystals in a colloid dispersion medium, the process being characterized in that it comprises forming a shell of silver halide on the chemically sensitized crystals by simultaneously adding to the dispersion an aqueous solution of a water soluble halide or pseudo-halide, an aqueous solution of silver nitrate and a J-band aggregating spectral sensitizing dye in an aqueous medium, the said simultaneous additions being continued for sufficient time to form a shell of silver halide or pseudo-halide on the said chemically sensitized silver halide crystals which is up to 15 mole percent of the total silver halide or pseudo-halide of the fully grown crystals.

Abstract: A method for manufacturing a photosensitive silver halide emulsion which comprises the steps, in sequence, of forming silver bromide grains which have predominantly (111) crystal faces or mixed halide grains of any morphology in the presence of a hydrophilic colloid; contacting said grains with a silver halide complexing agent which also forms insoluble silver salts; spectrally sensitizing said grains with an aggregating spectral sensitizing dye prior to or simultaneously with chemical sensitization of said grains wherein said spectral sensitization takes place the presence of said silver halide complexing agent.

Abstract: Disclosed is a silver halide photographic material. The material comprises a support and at least one emulsion layer, wherein the emulsion layer includes a silver chlorobromide emulsion. The silver chlorobromide emulsion has been obtained by chemically sensitizing de-salted silver chlorobromide grains in the presence of a nucleic acid or degradation product thereof at a pAg value ranging from about 6.5 to 7.5. The silver chlorobromide grains have been obtained by subjecting the surface of silver halide grains to halogen conversion, which silver halide grains are essentially silver iodide free and have a plurality of phases of which the halogen compositions substanially differ from each other.

Abstract: A silver halide photographic emulsion containing silver halide grains having a silver chloride content of not less than 90 mol % and a method for preparing thereof are disclosed, wherein the silver halide grains are obtained by forming said silver halide grains in the presence of a water-soluble iridium compound and a nitrogen-containing heterocyclic compound capable of forming sparingly-soluble silver salt; and by controlling the addition of said iridium compound, whereby the photographic emulsion is improved in the dependence of gradation on exposure intensity.

Abstract: Photographic emulsions are disclosed comprised of radiation sensitive silver iodobromide grains, at least 50 percent of the total projected area of said silver iodobromide grains being accounted for by tabular grains exhibiting a mean tabularity of greater than 5, at least 10 percent of which are comprised of two opposed parallel major crystal faces, a host stratum having an iodide content of at least 4 mole percent, and laminar strata containing less than 2 mole percent iodide interposed between said host stratum and said opposed major crystal faces.The emulsions are characterized in that each of the laminar strata is comprised of a surface layer forming one of the major surfaces and having a thickness in the range of from 20 to 350 .ANG. and a subsurface layer located immediately beneath and in contact with the surface layer containing a hexacoordination complex of a Group VIII period 4 or 5 metal and at least three cyanide ligands.

Abstract: A process for producing a silver halide photographic material that has at least one silver halide emulsion layer on a support, in which process at least 10 mg of a calcium salt per mole of silver halide is added during the period from the completion of physical ripening a silver halide emulsion to the completion of its chemical ripening together with at least one compound represented by the following general formula (I) and at least one compound represented by the following general formula (II): ##STR1## where R.sub.1 is a hydrogen atom or an alkyl group; R.sub.2 and R.sub.3 which may be the same or different are each a substituted or unsubstituted alkyl group; A.sub.1 -A.sub.6 are each a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom or a phenyl group, provided that adjacent atoms or groups may combine to form a ring; X is an anion; and n is 0 or 1, provided that n =0 when an intramolecular salt is formed; ##STR2## wherein Z.sub.

Abstract: Disclosed is a silver halide color photographic material comprising at least one silver halide emulsion layer on a support. The silver halide emulsion contains silver chlorobromide grains having a 2 to 4 layer stacked structure which layers differ in their content of silver chloride. The silver chloride distribution of each layer of the grains is completely uniform, and the difference in the silver chloride content between a first layer and a second layer of said grains ranges from 5 mole % to 27 mol %.

Abstract: There is disclosed a light-sensitive silver halide photographic material having at least one silver halide emulsion layer containing silver halide crystal grains which comprises at least one of the silver halide emulsion layer contains silver halide crystal grains which satisfy the following conditions of:(1) composed substantially of silver iodobromide,(2) having a maximum point of a silver iodide content at 67% or less of a distance from the center of the silver halide grain relative to a distance (l.sub.0) from the center of the silver halide grain to the outermost surface thereof,(3) having a minimum point of the silver iodide content at 58% or more of the distance form the center of the silver halide grain relative to l.sub.0 ,(4) substantially monotonously reduced in the silver halide content from the maximum point of the silver halide content to the minimum point thereof, and(5) satisfies the following formula: ##EQU1## wherein l.sub.0 has the same meaning as defined above, l.sub.

Abstract: A photographic silver halide emulsion, of which at least 50% by weight of the silver halide crystals are triply twinned crystals with a crystal structure consisting of a basic tetrehedron with [111]-faces and three identical twinned regions, each of which has a [111]-twin face in common with the basic tetrahedron and is outwardly bounded by three [100]-faces and one [111]-face or by four [100]-faces, and of which any two respective regions are connected to each other by a common [411]-twin face, and whose grain size distribution has a coefficient of variation of at most 20%, is suitable for the production of photographic materials having high sensitivity, high contrast and very high developability.

Abstract: A chemically sensitized silver halide photographic emulsion comprising silver halide grains, at least 70% of the projected surface area of all the silver halide grains being constituted by tabular grains having an aspect ration of at least 3, wherein at least 0.5 millimoles of a sensitizing dye and 0.5 to 5.0 millimoles of at least one silver halide adsorbing substance other than a sensitizing dye per mole of the silver halide are introduced in the emulsion preparation stage and are present during chemical sensization of the silver halide.

Abstract: A process for treating a tabular silver halide emulsion is disclosed comprising the steps of subjecting the tabular silver halide emulsion to reduction sensitization and to sulfur sensitization or selenium sensitization and/or gold sensitization in the presence of a nitrogen-containing heterocyclic compound which forms a complex with silver during the manufacture of the tabular silver halide emulsion, said tabular emulsion having a grain size distribution such that grains having an average aspect ratio of not lower than 3.0 constitute at least 50% of the total projected area of all of the silver halide grains. There is also disclosed a silver halide X-ray photographic material comprising a support having thereon at least one silver halide emulsion layer containing a tabular silver halide emulsion prepared in accordance with the above process.

Abstract: The present invention relates to a silver halide emulsion subjected to selenium sensitization in the presence of a palladium compound in an amount of 5.times.10.sup.-5 mol or more per mol of a silver halide. In addition to selenium sensitization, the emulsion may be subjected to sulfur sensitization and/or gold sensitization. In a process of manufacturing the silver halide emulsion, the palladium compound is preferably added to the emulsion before chemical sensitization.

Abstract: A direct positive silver halide photographic material is disclosed, comprising a support having thereon at least one internal latent image silver halide emulsion layer which has not been prefogged and another hydrophilic colloid layer wherein the grains in the internal latent image silver halide emulsion is formed in the presence of an iron complex compound. The direct positive silver halide photographic material is developed and then direct positive images may be obtained with this material, which feature a high D.sub.max and a low D.sub.min. The disclosed material has a broad range of applications, including as a COM film.

Abstract: A process for preparing a direct positive photosensitive material comprising providing on a support at least one silver halide light-sensitive emulsion layer containing the combination of (a) non-prefogged internal latent image silver halide grains; (b) a binder; (c) at least one compound represented by formulae (I), (II), or (III); and at least one compound represented by formula (IV):R--SO.sub.2 S--M (I)R--SO.sub.2 S--R.sup.1 (II)R--SO.sub.2 S--L.sub.m --S.O.sub.2 S--R.sup.2 (III)wherein R, R.sup.1 and R.sup.2 each represents a substituted or unsubstituted aliphatic group, a substituted or unsubstituted aromatic group or a substituted or unsubstituted heterocyclic group; M represents a cation; L represents a divalent linking group; and m is 0 or 1; andR.sup.3 --SO.sub.2 --M.sup.1 (IV)wherein R.sup.3 represents an aliphatic group, an aromatic group or a heterocyclic group; and M.sup.1 represents a cation. The material provides a direct positive image with high Dmax, low Dmin and high contrast.

Abstract: Silver halide grains for use in silver halide photography having a regular crystal shape and including at most two irregularly grown crystal faces and a silver halide photo-sensitive material containing these silver halide grains are disclosed.

Abstract: A process of forming silver halide grains which comprises disposing a mixer outside of a reaction vessel for causing the nucleus formation and crystal growth of silver halide grains. The process further includes the steps of: supplying an aqueous solution of a water-soluble silver salt, an aqueous solution of a water-soluble halide, and an aqueous protective colloid solution into the mixer to form fine, silver halide grains therein; immediately supplying the fine grains into the reaction vessel; and performing the nucleus formation and crystal growth of the silver halide grains in the reaction vessel. The formation of the fine grains is controlled by controlling the flow rates of the solutions being supplied to the mixer and the r.p.m. of a stirrer provided in the mixer.

Abstract: A novel direct positive photosensitive material is provided comprising a support having therein at least one photographic emulsion layer containing internal latent image type silver halide grains not having been previously fogged, wherein the photographic emulsion layer comprises:(1) at least one of compounds represented by the general formulae [I], [II] and [III]; and(2) at least one of compounds represented by the general formulae [IV], [V] and [VI]:R--SO.sub.2 S--M [I]R--SO.sub.2 S--R.sup.1 [II]R--SO.sub.2 S--Lm--S.O.sub.2 S--R.sup.2 [III]wherein R, R.sup.1 and R.sup.2 may be the same or different and each represents an aliphatic group, aromatic group or heterocyclic group; M represents a cation; L represents a divalent connecting group; and m represents an integer 0 or 1;M'.sub.2 SO.sub.3 [IV]M'HSO.sub.3 [V]M'.sub.2 S.sub.2 O.sub.5 [VI]wherein M' represents a hydrogen atom or cation.

Abstract: Base and auxiliary solvent solubilized precipitated dispersions of couplers and other photographic materials usually produce very small particle dispersions, and usually such dispersions are extremely highly reactive because of the smallness of the particle size. However, some relatively more hydrophobic couplers, even though they produce small particles when a dispersion is formed by the precipitation technique, lead to extremely unreactive dispersions. The method of this invention constitutes a single step coprecipitation technique where a base deprotonation compound, preferably a liquid carboxylic acid, is incorporated into the precipitated particles to produce photographically highly active coupler dispersions.

Abstract: The invention is generally accomplished by providing nucleation of silver halide crystals or grain without backmixing or exposure to previously nucleated grains. Generally this is accomplished by injecting a solution of silver nitrate into a solution of sodium bromide and peptizer as it is moving in pipe in a type of flow which does not provide back mixing and moves in generally plug flow. The plug flow is carried out until nucleation is complete and then the nucleated grains are transferred to a mixing container where they are ripened, grown, and subjected to the normal treatments, such as sensitization, applied to the silver halide to be used photgraphically.

Abstract: A silver halide photographic material comprising a support, and at least one silver halide emulsion layer containing silver halide grains on the support, wherein the silver halide grains have an internal area formed in at least one corner of the grains, the internal area having a silver iodide content higher than the silver iodide content of the circumferential area of the grains.

Abstract: A high-speed color negative photographic material which comprises, a support having provided thereon, at least one red-sensitive silver halide emulsion layer, at least one green-sensitive silver halide emulsion layer and at least one blue-sensitive emulsion layer, and is designated so as to acquire a specific photographic sensitivity (defined in detailed description of the invention) of 800 or above, and has a combined total of silver coverages ranging from 3.0 g/m.sup.2 to 9.0 g/m.sup.2 so as to minimize an increase in fog, a decrease in photographic speed and deterioration in granularity, which heretofore have occurred in high-speed photographic materials during long-range storage before used. In addition, the present photographic material enables enhancement of pressure resistance and processing efficiency.

Abstract: A silver halide photographic emulsion comprising silver halide grains is disclosed, wherein at least 60% of the total projected area of the silver halide grains is comprised of tabular silver halide grains having a central portion and an outer portion, of which the iodide content of the central portion is from 7 mol % to the solid solution limit, and which have two parallel twinned crystal planes.A method for the manufacture of the silver halide emulsion is also disclosed, which comprises the steps of nucleating the silver halide grains under conditions where the gelatin concentration in the reaction solution is set at from 0.1 to 20 wt %, the addition rates of the silver salt and the halide are set at from 6.times.10.sup.-4 to 2.9.times.10.sup.-1 mol/minute per liter of reaction solution, and the pBr value in the reaction solution is set at from 1.0 to 2.5, Ostwald ripening the nucleated grains, and then growing the thus ripened grains.

Abstract: A direct positive photosensitive material composed of a support having thereon at least one photosensitive emulsion layer comprising non-prefogged internal latent image silver halide grains and at least one compound represented by formulae (I), (II), (III) or (IV): ##STR1## wherein M.sub.1 represents hydrogen, a cation or a protective group capable of being cleaved by an alkali; and Z represents an atomic group necessary for forming a 5-membered or 6-membered substituted or unsubstituted ring selected from a heterocyclic ring and a condensed heterocyclic ring; ##STR2## wherein Z.sub.1 represents an alkyl group containing from 1 to 18 carbon atoms, an aryl group containing from 6 to 18 carbon atoms or a heterocyclic group; Y.sub.1 and Y.sub.2, which may be the same or different, each represents an atomic group necessary for forming an aromatic ring containing from 6 to 18 carbon atoms or a heterocyclic ring; M represents a metal atom or an organic cation; and n is an integer of 2 to 10.

Abstract: A silver halide photographic light-sensitive material includes a support and at least one layer of silver halide emulsion formed on the support. The emulsion layer contains silver halide grains which have been subjected both to reduction sensitization while growing and to at least one chemical sensitization selected from the group consisting of gold sensitization, sulfur sensitization, and noble-metal sensitization. Each of the silver halide grains has at least 5 mol % of silver iodide on a surface thereof.

Abstract: Color photographic recording material having a layer support and at least one silver halide emulsion layer sensitive to blue light, in which the silver halide of the blue sensitive silver halide emulsion layer is sensitized with a blue sensitizer of the J-band type and contains at least 95 mol % of silver chloride is distinguished by high sensitivity with low fog.

Abstract: Light-sensitive silver halide photographic materials are disclosed comprising a support and silver halide emulsion layer or layers, wherein at least one of said silver halide emulsion layers contains tabular silver halide grains having an average diameter:thickness ratio of at least 3:1 and at least one resorcinol.The light-sensitive materials can be advantageously used in high temperature processing without causing serious fog problems.

Abstract: Silver halide emulsions can be spectrally sensitized by adding a silver salt solution to them until the pAg value reaches a point close to equivalence, then adjusting the pAg value to a value between 7.5 and 10 by addition of halide or thiocyanate, adsorbing a part quantity of a sensitizing dye on the silver halide crystals of the emulsions, and repeating these steps once to seven times, and adding the residual quantity of sensitizing dye in the last repeat.

Abstract: A photochromic material adapted for coating light transmissive materials. The photochromic material contains photosensitive silver halide crystals having dimensions in the range of approximately 50 Angstroms to 800 Angstroms. The silver halide crystals are surface doped with copper ions and another sensitizer selected from mild reducing agents or sulfur-bearing ions. The crystals are dispersed in a protective polymer that does not irreversibly bind halogen.

Abstract: There is described a process for the production of a silver halide emulsion wherein the chemical sensitization is carried out in the presence of N-methyl formamide.

Abstract: A light-sensitive silver halide photographic material which comprises a support and provided thereon a silver halide emulsion layer containing silver halide grains of which silver chloride content is not less than 90 mol %, and which have been formed in the presence of an iridium compound and a nitrogen containing heterocyclic compound, and under acidic condition is disclosed.

Abstract: Photosensitive silver halide emulsions are disclosed which comprise photosensitives silver halide grains dispersed in a binder, wherein at least 70% of the total projected area of the silver halide grains is accounted for by tabular grains of a diameter of at least 0.15 .mu.m, wherein the mean aspect ratio of the tabular grains is not more than 8.0, wherein grains in which the value of the ratio (b/a) of the longest distance (a) between two or more parallel twinning planes in the tabular grain and the grain thickness (b) is at least 5 account for at least 50% (in terms of numbers of grains) of all of the tabular grains, and wherein at least 50% (in terms of the numbers of grains) of the tabular grains are grains in which the number of dislocations per grain is at least 10.

Abstract: Disclosed is a silver halide photographic material including a support and a photographic layer. The photographic layer includes at least one essentially silver iodide free monodisperse silver chlorobromide emulsion which is obtained using a particular bromine or bromide ion slow release agent. Also disclosed is a process for producing such a material.

Abstract: A process is disclosed for the preparation of a tabular grain silver bromoiodide emulsion in which silver bromoiodide laminae are formed on the major faces of the tabular grains. The sensitivity of the emulsion as a function of pressure applied is rendered more nearly constant by forming the silver bromoiodide laminae on the major faces of the tabular grains within a pAg and temperature range defined by Curve A in FIG. 1. The laminae are formed by first precipitating iodide as a silver salt at peripheral sites on the tabular grains and then precipitating silver bromoiodide onto the major faces of the host tabular grains with the primary source of iodide being the previously deposited iodide. The emulsions produced exhibit high sensitivity to exposing radiation and reduced sensitivity to localized pressure.

Abstract: A process is disclosed for the preparation of a tabular grain silver bromoiodide emulsion in which silver bromoiodide laminae are formed on the major faces of the tabular grains. The sensitivity of the emulsion as a function of pressure applied is rendered more nearly constant by forming the silver bromoiodide laminae on the major faces of the tabular grains. The silver bromoiodide laminae are formed on the major faces of the tabular grains with an iodide content higher than that of the host emulsion, and thereafter, within the pAg and temperature boundaries defined by Curve A in FIG. 1, bromide is deposited as a silver salt with the addition of iodide being limited or absent.

Abstract: A silver halide emulsion manufactured by performing reduction sensitization and addition of at least one compound selected from the group consisting of compounds represented by formulas [I], [II], and [III] during the silver halide grain formation in a process of manufacturing silver halide emulsions:R--SO.sub.2 S--M [I]R--SO.sub.2 S-R.sup.1 [II]RSO.sub.2 S--L.sub.m --SSO.sub.2 --R.sup.2 [III]wherein R, R.sup.1, and R.sup.2 can be the same or different and represent an aliphatic group, an aromatic group, or a heterocyclic group, M represents a cation, L represents a divalent bonding group, m represents 0 or 1, compounds represented by formulas [I] to [III] can be polymers containing, as a repeating unit, divalent groups derived from compounds represented by formulas [I] to [III], and, if possible, R, R.sup.1, R.sup.2 and L can be bonded with each other to form a ring.

Abstract: An improved process is disclosed of preparing a high chloride tabular grain emulsion. The concentration of thiocyanate ion in the dispersing medium at nucleation and during grain growth is relied upon a favor the formation of {111} crystal faces. The concentration of chloride ion in the thiocyanate ion containing dispersing medium is relied upon to produce the grain twinning necessary for tabular grain formation.

Abstract: Disclosed is a silver halide photographic emulsion containing tabular silver bromide series grains having a mean aspect ratio of 2 or more, which is characterized by the grains having no projection on the grain surface and by the silver chloride content in the surface part of the grains being higher than that in the part of the grain which is underneath the grain surface. Also disclosed is a multi-layer photographic light-sensitive material having at least two silver halide emulsion layers on a support in which at least one of the silver halide emulsion layers contains the tabular silver bromide series grains as defined above. By the incorporation of the emulsion, the sensitivity, the storage stability and the manufacture stability properties of the photographic material are improved without deteriorating its graininess property.

Abstract: A silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer, wherein the silver halide emulsion layer comprises a silver halide emulsion which satisfies condition (i) and wherein the silver halide emulsion layer or another silver halide emulsion layer having the same color sensitivity as that of the silver halide emulsion layer comprises a silver halide emulsion which satisfies condition (ii):Condition (i): tabular grains having at least two twinning planes, a diameter of at least 0.15 .mu.m and an average aspect ratio of at least 2 account for at least 70% of silver halide grains as calculated in terms of projected area and grains having a (b/a) ratio of at least 5 wherein (a) is the longest distance between the two or more parallel twinning planes and (b) is the grain thickness account for at least 50% of the tabular grains by number;Condition (ii): grains having a diameter of at least 0.15 .mu.

Abstract: A process for preparing a silver halide emulsion, which comprises dissolving one or more substantially water-insoluble photographic additives in a heated solution of an organic solvent containing a surfactant having a hydrophilic --CO.sub.3 or --OSO.sub.3 group to completely dissolve the one or more substantially water-insoluble additives, cooling the resulting solution to precipitate crystals, separating the crystals from the solution, drying the separated crytals, dispersing said crystals in water and adding the resulting dispersion to a silver halide emulsion.

Abstract: A silver halide photographic light-sensitive material having at least one light-sensitive silver halide emulsion layer on a support, wherein the ratio of the total weight of potassium ion in the photographic light-sensitive material to the total weight of silver in the photographic light-sensitive material is 1.times.10.sup.-3 or less. The silver halide photosensitive material is improved in long-term storage stability.

Abstract: Black-and-white continuous tone reproductions may be obtained under daylight conditions with a photographic recording material in which the silver halide consists to an extent of at least 75 mol % of silver chloride and has been prepared in the presence of a 1-phenyl-5-mercaptotetrazole compound. The material is particularly suitable for reprophotographic work, e.g. for the production of continuously graduated masks.

Abstract: A silver halide photographic emulsion comprising a dispersant and silver halide grains, at least 50% of the total projected area of the silver halide grains being occupied by tabular grains having an average aspect ratio of 2 or more, the tabular grains comprising opposing parallel major faces consisting of a (1 1 1) face, and at least 30% of the tabular grains having an indentation or space in the central portion of the major faces thereof.

Abstract: A pre-fogged direct positive silver halide emulsion comprising silver halide grains which have been formed in the presence of a compound represented by the following formula (I):R--SO.sub.2 --M (I)wherein R represents an aliphatic group, an aromatic group or a heterocyclic group, and M represents a hydrogen atom or a cation. The invention also relates to a method for making such a photographic material.

Abstract: A silver halide photographic emulsion is described which has excellent color-sensitizing efficiency by sensitizing dyes, sharpness, covering power, and pressure resistant properties, wherein the grains are comprised of core/shell type grains having contained therein a partially halogen-converted silver salt phase, the silver salt comprising silver halochloride, silver thiocyanate or silver citrate.

Abstract: A silver halide color negative photographic light-sensitive material is disclosed which is improved on stability to fluctuation of processing conditions applied thereon, and has a sufficient wide exposure latitude. The photographic material is also improved on standing stability of silver halide emulsion in the course of manufacturing thereof. The photographic material comprises a support having thereon photographic component layers including at least one silver halide emulsion layer containing at least two groups of silver halide grains each being substantially different in desensitizing agent content from each other.

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 carbonyl coordination ligand and a transition metal chosen from groups 8 and 9 of the periodic table of elements.

Abstract: Process for stabilizing the crystalline grain morphology of silver halide grain cores prepared in the presence of a dispersing medium and an aminoazapyridine compound at a pH of 2.5 to 9 and pCl of 0 to 3, at least 50% of the total projected area of the total grain population being noncubic silver halide grain cores and the halide content being at least 50 mole percent chloride, based on total moles of silver precipitated, the improvement wherein after 60% of aqueous silver salt solution based on the total moles of silver precipitated is introduced a second halide salt, e.g., bromide, is added thereby forming on the grain cores a shell of 0.5 to 20 mole % based on the total moles of silver precipitated. The emulsions are useful in X-ray, color separation, inverse transfer films, and "dry-silver" applications, etc.