Abstract: The invention is generally accomplished providing a silver halide emulsion comprising silver halide grains and a palladium compound represented by Formula I:PdX.sub.2 (TeR.sub.2).sub.2whereinX is Cl, Br, I, NCO, NCS, NCSe, N.sub.3, or O.sub.2 CR'R, R' are alkyl or aryl.

Abstract: The invention is generally accomplished providing a silver halide emulsion comprising silver halide grains and a gold compound represented by Formula I:{AuS.sub.2 X}.sub.nwhereinX is PR.sub.2 (dithiophosphinates), P(OR).sub.2 (dithiophosphates), COR (xanthates), CNR.sub.2 (dithiocarbamates), CR (dithiocarboxylates)R is alkyl or aryln=1-6.

Abstract: A dual-coated radiographic element is disclosed containing high bromide tabular grain emulsion layers exhibiting increased covering power and colder image tones. A covering power enhancing compound containing at least one divalent sulfur atom adsorbed to grain surfaces and a gelatino-vehicle are present in the emulsion layers. The emulsion layers additionally include a water soluble polymer chosen from the class consisting of polyacrylamide and dextran.

Abstract: The invention is generally accomplished by providing a method of chemical sensitization comprising providing a silver halide emulsion, and adding to the silver halide emulsion aqueous solid particle dispersion of a chemical sensitizing agent having a water and organic solvent insolubility (i.e., 50 mg/100 ml or less), and heating said emulsion wherein said chemical sensitizing agent comprises at least one member selected from the group consisting of gold compounds represented by Formula I:{AuS.sub.2 X}.sub.n IwhereinX is PR.sub.2 (dithiophosphinates), P(OR).sub.2 (dithiophosphates), COR (xanthates), CNR.sub.2 (dithiocarbamates), CR (dithiocarboxylates)R is alkyl or aryln=1-6,tellurium compounds represented by Formula II:TeL.sub.n X.sub.2whereinL is thiourea or substituted thiourea,n is 2 or 4,X is Cl, Br, I, OCN, SCN, SeCN, TeCN, or N.sub.3 andFormula IIA ##STR1## wherein X is COR, CSR, CNR.sub.2, CR, CAr, PR.sub.2, P(OR).sub.2, (PR.sub.2).sub.

Abstract: A high sensitivity silver halide emulsion excellent in keeping quality and rapid processing in which tabular silver halide grains having {100} faces as two main planes parallel to each other, an aspect ratio of 2 or more and a mean silver chloride content of 50 mol % or more occupy 50% or more of the total projected area of the silver halide grains, said silver halide emulsion being spectrally sensitized with a trimethineoxathiacyanine dye, etc., and a photographic material using the emulsion.

Abstract: This invention relates to a silver halide photographic element for digital exposure comprising a cubical silver chloride emulsion precipitated and/or chemically sensitized in the presence of an aryliodonium compound represented by the formula: ##STR1## wherein R.sup.1 and R.sup.2 and R.sup.3 are independently H, or aliphatic, aromatic or heterocyclic groups, alkoxy groups, hydroxy groups, halogen atoms, aryloxy groups, alkylthio groups, arylthio groups, acyl groups, sulfonyl groups, acyloxy groups, carboxyl groups, cyano groups, nitro groups, sulfo groups, alkylsulfoxide or trifluoralkyl groups, or any two of R.sup.1, R.sup.2 and R.sup.3 together represent the atoms necessary to form a five or six-membered ring or a multiple ring system;R.sup.4 is a carboxylate salt or 0.sup.- ; w is 0 or 1; and X.sup.- is an anionic counter ion; with the proviso that when R.sup.3 is a carboxyl or sulfo group, w is 0 and R.sup.4 is 0.sup.-.

Abstract: The invention relates to a method of forming a silver halide emulsion comprising nucleating silver bromide nuclei while reactive contact with ammonia, a digestion said nuclei, bringing a thioether into reactive contact with said nuclei, growing the nuclei by addition of silver ion, iodide and bromide, wherein during at least the first portion of growth, the pH is maintained at about 9.

Abstract: A silver halide photographic material comprising a support having at least one pre-fogged direct positive emulsion layer provided on at least one side of the support, wherein silver halide grain formation of the emulsion is carried out in the presence of a silver halide solvent, the emulsion contains at least one of an Rh salt, an Ru salt or a polybromoiridium salt, and at least one compound selected from the group consisting of compounds represented by the following formula (I), (II) and (III) is added to the emulsion while the silver halide photographic material is prepared:R--SO.sub.2 S--M (I)R--SO.sub.2 S--R.sup.1 (II)R--SO.sub.2 S--L.sub.m --SSO.sub.2 --R.sup.2 (III)wherein R, R.sup.1 and R.sup.2 are the same or different, and each represents an aliphatic group, an aromatic group or a heterocyclic group; M represents a cation; L represents a divalent linking group; and m represents 0 or 1.

Abstract: A photographic element comprises a support and at least one silver halide emulsion layer in which the silver halide is sensitized with a fragmentable electron donor of the formula X--Y, wherein X is an electron donor moiety and Y is a leaving group other than hydrogen, and wherein:1) X--Y has an oxidation potential between 0 and about 1.4 V; and2) the oxidized form of X--Y undergoes a bond cleavage reaction to give the radical X.sup..cndot. and the leaving fragment Y.In a preferred embodiment of the invention, the radical X.sup..cndot. has an oxidation potential .ltoreq.-0.7V.

Abstract: A photographic element comprising at least one silver halide emulsion layer in which the silver halide is sensitized with a compound of the formula: ##STR1## wherein A is a silver halide adsorptive group that contains at least one atom of N, S, Se, or Te that promotes adsorption to silver halide, and L represents a linking group containing at least one C, N, S or O atom, k is 1 or 2, and XY is an fragmentable electron donor moiety in which X is an electron donor group and Y is a leaving group other than hydrogen, and wherein:1) XY has an oxidation potential between 0 and about 1-4 V; and2) the oxidized form of XY undergoes a bond cleavage reaction to give the radical X.sup..cndot. and the leaving fragment Y.In a preferred embodiment of the invention, the radical X.sup..cndot. has an oxidation potential .ltoreq.-0.7V.

Abstract: This invention relates to a silver halide photographic element comprising a silver halide emulsion precipitated and/or chemically sensitized in the presence of an aryliodonium compound represented by the formula: ##STR1## wherein R.sup.1 and R.sup.2 and R.sup.3 are independently H, or aliphatic, aromatic or heterocyclic groups, alkoxy groups, hydroxy groups, halogen atoms, aryloxy groups, alkylthio groups, arylthio groups, acyl groups, sulfonyl groups, acyloxy groups, carboxyl groups, cyano groups, nitro groups, sulfo groups, alkylsulfoxide or trifluoralkyl groups, or any two of R.sup.1, R.sup.2 and R.sup.3 together represent the atoms necessary to form a five or six-membered ring or a multiple ring system;R.sup.4 is a carboxylate salt or 0.sup.- ; w is 0 or 1; and X.sup.- is an anionic counter ion; with the proviso that when R.sup.3 is a carboxyl or sulfo group, w is 0 and R.sup.4 is 0.sup.-.

Abstract: A photosensitive emulsion is disclosed comprised of a dispersing medium and silver halide grains containing at least 80 mole percent bromide, based on silver, wherein at least 50% of the projected area of said silver halide grains is accounted for by tabular grains free of twin planes having {100} parallel major faces, said emulsion being chemically sensitized and having a reciprocity failure of less than 35 sensitivity units between exposures of respectively 10.sup.-5 seconds and 100 seconds. The emulsion can be employed as a latent image forming emulsion in a photographic element.The emulsion can be prepared by a process preparing a silver bromide photosensitive emulsion, comprising the following essential steps: (a) a nucleation step whereby a fine-grain emulsion with a pAg of between 4 and 6.

Abstract: Blue-black color favored in medical imaging is imparted to black and white photographic emulsions by the addition of a compound of formula I or II: ##STR1## wherein: R.sup.1 and R.sup.2 independently represent one or more carbon atoms necessary to complete a 5, 6 or 7 membered ring;R.sup.3 and R.sup.4 independently represent H, alkyl or aryl groups or together represent the atoms selected from C, N, O and S necessary to complete a 5, 6 or 7 membered cyclic ring but are not both H;R.sup.5 and R.sup.6 independently represent H or alkyl or together represent the atoms selected from C, N, O and S necessary to complete a 5, 6 or 7 membered ring;X represents a bond or a divalent linking group,each Y may be the same or different and is selected from S, Se, O, and NR.sup.7, where R.sup.7 is H or alkyl of up to 5 carbon atoms, andZ is S or Se.

Abstract: A photographic element is provided comprising a support having situated thereon a silver halide emulsion layer, the emulsion layer comprising a compound of the formula:Z--SO.sub.2 S--Au(I)--L (I)whereinZ represents an alkyl, aryl, or heterocyclic group; andL represents a thioether, selenoether or telluroether containing ligand.

Abstract: There is disclosed a silver halide color photographic material comprising a silver halide emulsion of high-silver chloride emulsion wherein a thiosulfonic compound represented by formula (I) and a sulfinic acid compound represented by formula (II) are added in the step of the production of said emulsion followed by sulfur sensitization. The disclosure described provides a silver halide color photographic material less in fogging due to the lapse of time after preparation of the emulsion for coating and less in fogging due to rapid development processing.

Abstract: A radiation-sensitive emulsion is disclosed comprised of a dispersing medium and a coprecipitated grain population having a coefficient of variation of less than 30 percent. The coprecipitated grain population consists essentially of tabular grains containing greater than 50 mole percent bromide, based on silver, and having {111} major faces. The dispersing medium is comprised of (a) a cationic starch peptizer and (b) a polyalkylene oxide block copolymer surfactant.

Abstract: This invention provides a silver halide photographic element comprising a silver halide emulsion in reactive association with a dioxide compound represented by the following formula: ##STR1## wherein b is C(O), C(S), C(Se), CH2 or (CH2)2; and R.sup.1 and R.sup.2 are independently H, or aliphatic, aromatic or heterocyclic groups, or R.sup.1 and R.sup.2 together represent the atoms necessary to form a five or six-membered ring or a multiple ring system. This invention further provides a method of making silver halide emulsions containing the dioxide compounds.

Abstract: A silver halide color photographic light sensitive material is disclosed, comprising a support having thereon hydrophilic colloid layers including a silver halide emulsion layer, wherein the silver halide emulsion layer contains photosensitive silver halide grains which have been selenium-sensitized or tellurium sensitized; and at least one of the hydrophilic colloid layers contains an organic dye represented by the following formula.

Abstract: A color recording photographic element is disclosed containing a support and, superimposed on the support, blue, green and red recording layer units. The layer unit nearest the support contains a high chloride tabular grain emulsion and an optionally esterified glycolic ether having a molecular weight of at least 300 and containing at least one thioether moiety. The layer unit farthest from the support is free of the optionally esterified glycol compound. The advantages realized are an increased imaging density range, increased sensitivity, and increased contrast.

Abstract: The invention provides a method of treating silver chloride emulsions comprising providing a silver chloride emulsion, adding gold and sulfur chemical sensitizers, heating to chemically sensitize said emulsion, cooling to below about 50.degree. C., adding bromide to the emulsion and then after bromide addition adding spectral sensitizing dye.

Abstract: A photographic element comprising a support having situated thereon a silver halide emulsion layer, said emulsion layer comprising a compound of the formula:Z--SO.sub.2 S--Au(I)--SQ (I)whereinZ represents an alkyl, aryl, or heterocyclic group; andQ represents an aryl or heterocyclic group.

Abstract: A method for chemically sensitizing a silver halide photographic emulsion with a selenium compound is disclosed. The sensitizing method comprises the steps ofpreparing a dispersion of solid particles of a selenium compound in an aqueous medium by a process comprising the following steps of(1) dissolving a substantially water-insoluble organic selenium compound in a substantially water immiscible low-boiling organic solvent to prepare a selenium compound solution,(2) dispersing the selenium compound solution in water or an aqueous solution of a dispersing aid to form a oil-in-water type dispersion, and(3) removing the organic solvent from the oil-in-water type dispersion by stirring the dispersion under a decompressed condition to precipitate the selenium compound so as to form a dispersion of fine solid particles of the selenium compound having an average particle size of 10 nm to 3 .mu.

Abstract: This invention provides a silver halide photographic element comprising a silver halide emulsion in reactive association with a dithiolone 1-oxide compound represented by the following formula: ##STR1## wherein b is C(O), C(S), C(Se), CH.sub.2 or (CH.sub.2).sub.2, and R.sup.1 and R.sup.2 are independently H, or aliphatic, aromatic or heterocyclic groups, alkoxy groups, hydroxy groups, halogen atoms, aryloxy groups, alkylthio groups, arylthio groups, acyl groups, sulfonyl groups, acyloxy groups, carboxyl groups, cyano groups, sulfo groups, or amino groups, or R.sup.1 and R.sup.2 together represent the atoms necessary to form a five or six-membered ring or a multiple ring system. It further provides a method of making a silver halide emulsion containing a dithiolone 1-oxide compound.

Abstract: A silver halide photographic material is disclosed, which comprises a support having thereon at least one light-sensitive silver halide emulsion layer comprising silver halide grains sensitized with a selenium or tellurium sensitizer and having a silver chloride content of 50 mol % or more, wherein the silver halide emulsion layer or other hydrophilic colloid layer contains polymer latex having an active methylene group. The silver halide photographic material provides high storage stability and less pressure marks.

Abstract: The invention is generally accomplished providing a silver halide emulsion comprising silver halide grains and a tellurium compound represented by Formula I:TeL.sub.n X.sub.2whereinL is thiourea or substituted thiourea,n is 2 or 4,X is Cl, Br, I, OCN, SCN, SeCN, TeCN, or N.sub.3 orFormula II ##STR1## wherein X is COR, CSR, CNR.sub.2, CR, CAr, PR.sub.2, P(OR).sub.2R is alkyl or aryl.

Abstract: The invention concerns a color negative process wherein a photographic material comprising silver chloride or silver bromide and a DIR or DIAR coupler is processed in the presence of a polyester comprising intralinear thioether atoms.

Abstract: A silver halide photographic material comprising a support having thereon at least one light-sensitive layer, the photographic material comprising a reduction-sensitized silver halide emulsion containing a compound in which a group adsorptive to silver halide and a specific hydrazine structure are covalently bonded. The silver halide photographic material exhibits high sensitivity and improved fog characteristics and improved preservation stability.

Abstract: A silver halide color photographic material having photographic constituent layers on a support, said photographic constituent layers comprising at least 3 kinds of silver halide emulsion layers different in color sensitivity and each containing a coupler producing a yellow color, a magenta color, or a cyan color and at least one light-insensitive layer, in which a silver halide emulsion contained in at least one layer of said photographic constituent layers comprises silver chloride grains or silver chlorobromide grains having a silver chloride content of 90 mol % or more sensitized by at least one compound selected from the group consisting of a gold compound, a selenium compound and a tellurium compound and at least one layer of said photographic constituent layers contains a pentamethineoxonol dye containing a substituent group at the methine chain, whereby the silver halide color photographic material exhibits excellently rapid processing performance, high purity whiteness in the white background of a fi

Abstract: The invention is generally accomplished providing to a method of sensitizing silver halide grains comprising providing a silver halide grain and bringing said grain into contact with a compound of Formula I,C.sup.+ {S.sub.2 COR}.sup.- Formula IwhereC is NH.sub.4.sup.+, AR'.sub.4.sup.+ or M.sup.+A is N, P, or AsR' is alkyl or arylM is Li, Na, or K, andR is alkyl or aryl.

Abstract: A silver halide photographic material having high sensitivity, reduced in fog and excellent in storage stability is described, which comprises a support having thereon at least one constituent layer containing at least one hydrazone compound having a methine dye residue or an adsorbing group to silver halide through a covalent bond or containing at least one metallocene compound having a methine dye residue through a covalent bond.

Abstract: A silver halide emulsion which comprises at least one dispersion medium and silver halide grains, wherein not less than 30% of the total projected area of the silver halide grains accounts for tabular grains each (i) having a {100} face as a major face, (ii) having an aspect ratio (diameter/thickness) of not less than 1.5, and (iii) having a nucleus during nucleus formation, the nucleus being present within the square of not more than 10% of the entire projected area of each of said silver halide grains when viewed the silver halide grains from the vertical direction to the major faces, the square containing one corner of each of said silver halide grains.

Abstract: Silver halide recording material for making negative images having ultrahigh contrast.Known silver halide recording materials for making negative images having ultrahigh contrast contain hydrazine compounds and contrast enhancing compounds (so-called boosters). The invention involves a material having a new class of such a booster, containing in its molecule at least one nitrile group and a tertiary amino group. The invention also includes a process for making black-and-white negative images having ultrahigh contrast by using the invention's materials. The invention is particularly useful in the pre-press stage for printing.

Abstract: A silver halide photographic material containing at least one silver halide emulsion layer on a support is provided. The silver halide emulsion layer comprises chemically sensitized silver halide grains having a silver chloride content of 50 mol % or more, said silver halide emulsion has been spectrally sensitized with at least one dye selected from the dyes represented by one of the general formulas (1), (2) and (3) shown in the specification. The emulsion layer or at least one other hydrophilic colloidal layer contains at least one member selected from the hydrazine derivatives represented by one of the formulas (4), (5) and (6) shown in the specification and at least one compound selected from the compounds represented by one of the formulas (7), (8), (9), (10), (11) and (12) shown in the specification.A process for the formation of an image is also provided, which comprises the development of a silver halide photographic material as defined above with a developer having a pH value of 9.6 to less than 11.

Abstract: A silver halide emulsion is disclosed, which is subjected to chemical ripening using a labile tellurium sensitizer and/or a labile selenium sensitizer in the presence of at least one compound represented by formula (I), (II), (III) or (IV) described in the specification.

Abstract: A silver halide photographic emulsion is disclosed, containing tabular silver halide grains each comprising plural silver halide phases different in a silver iodide content from each other, in which a highest silver iodide containing phase has a silver iodide content of not less than 5 mol % and less than 15 mol %, and a lower silver iodide containing phase is present outside and contiguous to the highest silver iodide containing phase; the tabular grains having 5 or more dislocation lines per grain and accounting for not less than 30% by number of total silver halide grains, the tabular grains further having a hole trap zone within the grain.

Abstract: The invention is directed to a process for preparation of a silver halide emulsion comprising providing an unsensitized emulsion, heating to carry out chemical sensitization of said emulsion, cooling said emulsion, heating said emulsion a second time to complete heat treatment.

Abstract: A method for producing a silver halide emulsion, said method comprising: adding silver nitrate to a halogen compound to form an emulsion grain; and doping a non-labile selenium compound in an amount, in terms of selenium added, of from 1.0.times.10.sup.-8 to 1.0.times.10.sup.-6 mol per a unit surface area of 1 m.sup.2 of said emulsion grain, at the time when from 10 to 49% of the total silver amount used for the formation of said emulsion grain is added.

Abstract: A dual coated radiographic element is disclosed including at least one radiation-sensitive emulsion comprised of silver halide grains containing greater than 50 mole percent bromide and less than 4 mole percent iodide, based on silver, with greater than 50 percent of total grain projected area being accounted for by tabular grains having {111} major faces, a spectral sensitizing dye adsorbed to the surfaces of the silver halide grains, and hydrophilic colloid vehicle acting as a peptizer and a binder for the silver halide grains. At least the portion of the vehicle acting as a peptizer is a hydrophilic colloid derived from a water dispersible cationic starch.

Abstract: The invention provides a radiation-sensitive silver halide emulsion comprisingsilver halide grains including tabular grains(a) having {111} major faces(b) containing greater than 70 mole percent bromide, based on silver,(c) accounting for greater than 90 percent of total grain projected area,(d) exhibiting an average equivalent circular diameter of at least 0.7 .mu.m,(e) exhibiting an average thickness of less than 0.07 .mu.m, and(f) having latent image forming chemical sensitization sites on the surfaces of the tabular rains, anda spectral sensitizing dye adsorbed to the surfaces of the tabular grains,wherein the surface chemical sensitization sites include at least one silver salt epitaxially located on said tabular rains and wherein said grains further comprise a mercapto compound represented by Formula III ##STR1## where R.sup.1 is an aliphatic or aromatic radical containing up to 20 carbon atoms.

Abstract: A silver halide photographic emulsion is disclosed, comprising silver halide grains containing a heavy metal ion and reduction sensitization nucleus within the grains, the grains having an overall average iodide content (I.sub.2) of 2 to 30 mol % and satisfying the following requirement,I.sub.1 <I.sub.2where I.sub.1 represents an iodide content of an outermost surface layer of the grains.

Abstract: A color negative film which contains support, at least one light-sensitive silver halide emulsion layer containing a color coupler and at least one light-insensitive layer adjacent thereto which contains a compound which reacts with the developer oxidation product during development with the splitting off of a radical which increases the sensitivity and which corresponds to formulas I or IIA-B-(T.sub.1).sub.m -(COUP-D)-(T.sub.2).sub.n (I)A-B-(T.sub.1).sub.m D (II).

Abstract: A photographic element comprising a support having situated thereon a silver halide emulsion layer, said emulsion layer comprising a compound of the formula:Z--SO.sub.2 S--Au(I)--SQ (I)whereinZ represents an alkyl, aryl, or heterocyclic group; andQ represents an aryl or heterocyclic group.

Abstract: This invention provides a color silver halide photographic element comprising a support having situated thereon a red light-sensitive, cyan dye-forming unit comprising a photosensitive silver halide emulsion layer and an image dye-forming coupler; a green light-sensitive, magenta dye-forming unit comprising a photosensitive silver halide emulsion layer and an image dye-forming coupler; and a blue light-sensitive, yellow dye-forming unit comprising a photosensitive silver halide emulsion layer and an image dye-forming coupler; wherein at least one of the dye-forming units comprises two or more emulsion layers spectrally sensitized to the same region of the visible spectrum, but exhibiting different photographic sensitivities, each such emulsion layer containing an image dye-forming coupler wherein at least one, but not all, of the emulsion layers of the dye-forming unit contains the hydrolyzed or unhydrolyzed form of a benzazolium compound represented by formula (I): ##STR1##

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 silver halide photographic material having good spectral-sensitivity to laser rays, and which forms a high-sensitivity and high-contrast image by short-time exposure with high-intensity light. When processed with a reduced amount of replenisher, there is little fluctuation of photographic properties of the processed photographic material. The present invention relates to a silver halide photographic material comprising a support having thereon at least one light-sensitive silver halide emulsion layer comprising a silver halide emulsion containing silver halide grains having a silver chloride content of 50 mol % or less, wherein the silver halide emulsion is spectrally sensitized with a spectral sensitizing dye selected from the group consisting of compounds represented by formulae (I), (II) and (III) and the silver halide emulsion is chemically sensitized with a selenium compound and a gold compound: ##STR1## where the substituent groups for formulae (I) to (III) are defined in the specification.

Abstract: There is disclosed a silver halide photographic light-sensitive material having a high sensitivity and an excellent rapid processability after exposure with a camera for a plate making. The light-sensitive material comprises a support having thereon at least one light-sensitive silver halide emulsion layer containing silver halide grains. The sliver halide grains contain a metal compound having a cyanide ligand represented by Formula I and have been subjected to sensitization with a selenium sensitizer and spectral sensitization with a sensitizing dye represented by Formula II:[M(CN).sub.m X.sub.6-m ].sup.n (I)wherein M represents iron, rhenium, osmium, ruthenium, or iridium; X represents a bridged ligand; m is 4, 5 or 6; and n is -2, -3 or -4: ##STR1## wherein Z represents a group of atoms necessary to form an oxazole nucleus, a benzoxazole nucleus or a naphthooxazole nucleus; R.sub.1 represents an optionally substituted alkyl group; R.sub.

Abstract: A color photographic light-sensitive material which has a high storage stability and a high sensitivity and in which photographic properties vary little with the passage of time from photography to development is provided. At least one light-sensitive silver halide emulsion layer constituting a silver halide color photographic light-sensitive material is spectrally sensitized with at least one type of a spectral sensitizing dye represented by Formula (I) below, and at least one silver halide emulsion contained in this light-sensitive silver halide emulsion layer is subjected to reduction sensitization in the manufacturing process of the emulsion. (In Formula (I), each of R.sub.11 and R.sub.12 represents an alkyl group, Z.sub.11 represents a group of atoms required to form a benzene ring, Z.sub.12 represents a group of atoms required to form a benzothiazole nucleus, a benzoselenazole nucleus, a benzoxazole nucleus, or a naphthoxazole nucleus, and X.sub.11 represents a charge-balancing counter anion.

Abstract: A step manufacturing method of a silver halide photographic emulsion comprising silver halide grains having a silver chloride content of not less than 95 mol % is disclosed, the method comprising the steps of mixing a silver salt and a halide to form a silver halide emulsion and chemically ripening the resulting silver halide emulsion,wherein a compound having two or more sulfonic acid or sulfonic acid salt groups in its molecule is added to the silver halide emulsion at the chemical ripening.

Abstract: A method of chemical sensitisation which comprises providing a silver halide emulsion containing negative-acting silver halide grains, and adding to said silver halide emulsion a sulphur releasing organic polymer having multiple sulphur releasing groups per polymer molecule. The polymer preferably has at least 10 sulphur releasing groups per molecule which may be selected from thiocarbonate, dithiocarbonate, trithiocarbonate, dithioester, thioamide, thiocarbamate, dithiocarbamate, thiouram, thiourea, dithiooxamide, thioketone and trisulphide.

Abstract: This invention provides a photographic element comprising a support having thereon a silver halide emulsion layer which is greater than about 50 mole % silver chloride, wherein the emulsion layer contains a thiophosphate ester of the structure: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are independently selected from the group consisting of an aliphatic, carbocyclic or heterocyclic group.