Abstract: A silver halide photographic material comprising a support having provided thereon at least one silver halide emulsion layer, wherein the silver halide emulsion comprises silver halide grains having a silver chloride content of 50 mol % or more, and the silver halide grain contains a cyanochromium complex ion represented by the following formula (I) and at least one complex of a metal selected from rhodium, ruthenium, osmium, rhenium and iron:?Cr(CN).sub.6-n L.sub.n !.sup.m- (I)wherein L represents H.sub.2 O or OH; n represents 0 or 1; and m represents 3 or 4.

Abstract: The invention relates to a silver halide photographic emulsion comprising a silver halide emulsion wherein the grains of said emulsion comprise silver chloride said grains are sensitized with a water soluble gold(I) or (III) compound, and said emulsion further comprises a dithiolone dioxide.

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: Radiation sensitive emulsions are disclosed comprised of silver iodochloride grains having three pairs of equidistantly spaced parallel {100} crystal faces and containing from 0.05 to 3 mole percent iodide, based on total silver, in a controlled, non-uniform iodide distribution forming a core containing at least 50 percent of total silver, a surface shell, and a sub-surface shell that contains a maximum iodide concentration and provides, when the emulsion is exposed to 390 nm electromagnetic radiation at 10.degree. K., stimulated fluorescent emissions in the range of from 450 to 470 nm and at 500, the stimulated fluorescent emission in the range of from 450 to 470 nm having a peak intensity more than twice the stimulated fluorescent emission intensity at 500 nm.

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 silver halide black-and-white photographic light sensitive material is disclosed, comprising a support having thereon a silver halide emulsion layer comprising silver halide grains, wherein at least 50% of the total grain projected area is accounted for by tabular grains having a chloride content of 20 mol % or more, two parallel {100}major faces and an average aspect ratio of 2 or more, said tabular grains being prepared by nucleating in the presence of a surfactant comprised of polyalkyleneoxide block copolymer.

Abstract: Tabular grain emulsions of enhanced photographic sensitivity are disclosed in which the tabular grains contain a maximum surface iodide concentration along their edges and a lower surface iodide concentration within their corners than elsewhere along their edges. The grains contain a dopant capable of providing shallow electron trapping sites.

Abstract: Photographic print elements are disclosed of enhanced speed and controlled minimum densities provided by emulsion layer units that contain emulsions that are blends of (a) cubical silver iodochloride grains that contain iodide in a controlled, non-uniform distribution forming a core containing at least half of total silver, a iodide-free surface shell having a thickness of greater than 25 .ANG., and a sub-surface shell that contains a maximum iodide concentration and (b) minimum density controlling silver halide grains that are of smaller mean grain size than the silver iodochloride grains and that consist essentially of chloride and/or bromide and are present in a molar concentration at least equal to that of silver iodide in the silver iodochloride grains.

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: Room-light handleable direct silver halide emulsions exhibit a broadened Dmin window when certain nitro-substituted aryl- or heteroaryl-containing imidazoles are included. These imidazoles act as excellent rereversal and Dmin suppressants. Photographic elements are prepared from these emulsions that can be handled in room-light if desired.

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: A photographic emulsion is disclosed comprised of a dispersing medium and radiation-sensitive grains with greater than 50 percent of total grain projected area being accounted for by tabular grains comprised of (1) a tabular host portion containing greater than 50 mole percent bromide, based on silver, and having spaced parallel {111} major faces, (2) a first epitaxial phase containing greater than 90 mole percent iodide, based on silver, accounting for less than 60 percent of total silver and overlying from 15 to 90 percent of the major faces, and (3) surface silver halide of a face centered cubic crystal lattice structure overlying at least a portion of the first epitaxial phase.

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: 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: The invention relates to an emulsion comprising silver halide grains, said grains being tabular and comprising sensitizing dye(s) and silver salt epitaxial deposits, and addenda that include a mercaptotetrazole and a tetraazaindene.

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: 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: The invention relates to a photographic element comprising a silver halide emulsion wherein at least one layer contains a silver chloroiodide emulsion containing at least 95 mole percent chloride and contains a sensitizing dye of the following general formula (I): ##STR1## wherein: Z1 represents a halogen, a cyano group, an amide substituted aromatic group, or a heteroaromatic group that is directly appended to the benzene ring shown or an aromatic group that is attached through an amide linking group andZ2 represents a substituted or unsubstituted alkyl group, substituted or unsubstituted alkoxy group, cyano group, a substituted or unsubstituted amide group, a substituted or unsubstituted carbamoyl group, halogen, an amide substituted aromatic group, or a heteroaromatic group that is directly appended to the benzene ring shown or an aromatic group that is attached through an amide linking group andW1 is one or more ions as needed to balance the charge on the molecule andR1 and R2 are, independently, substitu

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: 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: Palladium compounds are incorporated into a relatively low speed photographic print element. One embodiment of the invention comprises a silver halide light sensitive photographic print element comprising a support bearing at least one silver halide emulsion image forming layer, an antistatic layer containing vanadium pentoxide, and a palladium compound. In a preferred embodiment, the silver halide light sensitive photographic print element of the invention comprises a support bearing on one side thereof at least one blue-sensitive silver halide emulsion yellow-image forming layer, at least one red-sensitive silver halide emulsion cyan-image forming layer, and at least one green-sensitive silver halide emulsion magenta-image forming layer; an antistatic layer containing vanadium pentoxide; and a palladium compound.

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 silver halide color photographic material is disclosed, which comprises a support having provided thereon at least one blue-sensitive emulsion layer, at least one green-sensitive emulsion layer and at least one red-sensitive emulsion layer, wherein at least one emulsion layer in any one of color-sensitive layers contains a silver halide grain having incorporated therein a rhodium ion and the emulsion layer or a layer adjacent to the emulsion layer contains a silver halide emulsion with at least one of the inside and/or surface of substantially light-insensitive grains being fogged or colloidal silver.

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 is directed to a method of forming a sensitized high chloride silver halide emulsion comprising providing a high chloride emulsion bringing a Lippmann emulsion comprising fine grains of silver bromide doped with metal into contact with said emulsion at a temperature of above 50.degree. C. wherein said metal is present in an amount between 0.001 and 0.25 mg/silver mole, said bromide is present in an amount between 0.05 and 3.0 mole percent bromide and the relationship of bromide and metal dopant isM percent Br=Xe.sup.-(Y.multidot.Mt),X=1.36.+-.0.65,Y=10.+-.5,Mt=metal.

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 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 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: A chemically and spectrally sensitized ultrathin tabular grain emulsion is disclosed 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, and (e) exhibiting an average thickness of less than 0.07 .mu.m.It has been observed that increased speed and contrast as well as improvements in speed-granularity relationships can be realized when the surface chemical sensitization sites include epitaxially deposited silver halide protrusions forming epitaxial junctions with the tabular grains, the protrusions (a) being located on up to 50 percent of the surface area of the tabular grains, (b) having a higher overall solubility than at least that portion of the tabular grains forming epitaxial junctions with the protrusions, and (c) forming a face centered cubic crystal lattice.

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 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: Disclosed are silver halide elements that contain an arylhydrazine compound useful in producing high contrast images. The elements can be handled in bright light room conditions for extended periods of time without increasing minimum density of the element.

Abstract: A photographic emulsion is disclosed comprised of a dispersing medium and radiation-sensitive silver halide grains with greater than 50 percent of total grain projected area being accounted for by grains containing a host portion of a face centered cubic rock salt crystal lattice structure and a first epitaxial phase containing greater than 90 mole percent iodide. The host portion is tabular, being bounded by an exterior having first and second parallel major faces joined by a peripheral edge. The first epitaxial phase accounts for less than 60 percent of total silver, and the first epitaxial phase is restricted to a portion of the exterior of the host portion that includes at least 15 percent of the major faces.

Abstract: The present invention provides a photographic emulsion comprising a silver halide grains containing at least two dopants. The dopants comprise an osmium-based transition metal complex containing a nitrosyl or thionitrosyl ligand, and a transition metal complex containing a transition metal selected from Group 8 of the periodic table.

Abstract: A silver halide emulsion is described, which contains tabular silver halide grains having {100} faces as the parallel two major planes, having an aspect ratio of 2 or more and having a mean silver chloride content of 50 mol % or more, in an amount of 50% or more of the total projected area of all the silver halide grains therein, and which is spectrally sensitized with a particular trimethine dye of formula (I). A photographic material having the emulsion has a high sensitivity and good storability and can be processed rapidly.

Abstract: A tabular grain emulsion is disclosed that combines increased speed, reduced low intensity reciprocity failure, and low levels of pressure sensitivity. The tabular grains containing greater than 70 mole percent bromide and laminae located adjacent the {111} major faces each having a thickness of less than 35 nanometers and containing at least 1 mole percent higher iodide than a host portion of the tabular grains on which they are deposited. The tabular grains contain an iridium dopant capable of reducing low intensity failure in one interior grain portion and a Group 8 speed enhancing dopant present in a concentration of from 20 to 300 molar parts per million in another interior grain portion separated from the iridium containing grain portion by at least 10 percent of the silver forming the grain structure.

Abstract: A silver halide photographic element comprising a silver halide emulsion layer sensitized with a sensitizing dye of formula (I) which provides a maximum sensitivity at greater than 700 nm and which emulsion layer has substantially no dye deaggregating compound therein: ##STR1## wherein: X.sub.1 and X.sub.2 are independently sulfur, selenium or oxygen provided that X.sub.1 and X.sub.2 are not both oxygen and either benzo ring may be substituted or unsubstituted;R.sub.1 and R.sub.2 each independently represent an alkyl, aryl or heterocyclic group provided that at least one of R.sub.1 or R.sub.2 has an acid or acid salt substituent;A is a counterion as needed to balance the charge.

Abstract: A chemically and spectrally sensitized tabular grain emulsion is disclosed including tabular grains (a) having {111} major faces, (b) containing greater than 70 mole percent bromide and at least 0.25 mole percent iodide, 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, and (f) exhibiting an average thickness in the range of from less than 0.3 .mu.m to at least 0.07 .mu.m.

Abstract: A silver halide photographic material having the improved storability and anti-stress property is disclosed, which comprises a support having provided thereon at least one light-sensitive silver halide emulsion layer containing a silver halide emulsion, wherein the silver halide emulsion is subjected to a chemical sensitization with a selenium compound, and the emulsion layer or another layer provided on the support contains at least one of the compounds represented by formulas (I), (II) and (III): ##STR1## wherein R.sub.11 to R.sub.16, R.sub.21 to R.sub.26, R.sub.1 and R.sub.2 are defined in the specification.

Abstract: A color photographic light-sensitive material comprises at least two silver halide emulsion layer groups having different color sensitivities on a support. Each group contains at least two silver halide emulsion layers to essentially the same spectral range and having different sensitivities. A highest-speed layer of these at least two silver halide emulsion layers contains a silver halide emulsion in which selenium-sensitized silver halide grains with an aspect ratio of 3 or more occupy 50% or more of a total projected area. A lowest-speed layer of the at least two silver halide emulsion layers contains a selenium-sensitized regular crystal silver halide emulsion. In development of this light-sensitive material, a method of continuously processing which comprises exposing said photographic light-sensitive material, subjecting said photographic light-sensitive material to a developing solution and replenishing a developer solution with not mre than 500 ml of developer replenishing solution per 1 m.sup.2.

Abstract: Disclosed is a silver halide emulsion in which at least 50% of the total projected area of silver halide grains comprises tabular core/shell grains each having {100} planes as main planes and said silver halide grain substantially comprises silver chlorobromide with the halogen composition continuously being varied in the shell part.

Abstract: In a silver halide emulsion, tabular silver halide grains substantially consisting of silver bromoiodide, each having faces as two parallel major faces, an aspect ratio of 2 or more, and an average silver iodide content of 1 mol % or more, account for 50% or more of a total projected area of silver halide grains.

Abstract: A silver halide photographic light-sensitive material having at least one silver halide emulsion layer formed on a support, said emulsion layer containing tabular grains having an aspect ratio of 3 or more, which occupy at least 50% of the total projected area of all silver halide grains contained in the emulsion layer. The silver halide grains have been subjected to tellurium sensitization using at least butyl-diisopropylphosphinetelluride as a sensitizer, and also to other chemical sensitization.

Abstract: A silver halide photographic light-sensitive material. It comprises a support and at least one silver halide emulsion layer thereon, wherein at least one silver halide emulsion layer comprises silver chlorobromide emulsion particles containing 95 mol % or more of silver chloride or silver chloride emulsion particles as well as at least one thiosulfonic compound of formula (X) and at least one sulfinic compound of formula (Y), and the particles contained in the silver halide emulsion layer are sensitized by gold, selenium, or tellurium, and are spectrally sensitized by a red-sensitive methine dye represented by formula (I): ##STR1## wherein Q, R.sup.1 and other symbols each independently represents a specific atom or group, n is an integer from 0 to 6, M is a counter ion which neutralizes an electric charge, and m is 0 or 1.

Abstract: A radiation-sensitive emulsion is disclosed capable of producing the highest attainable speed compatible with low granularity. The silver halide grains (a) have a mean equivalent circular diameter of less than 0.6 .mu.m; (b) have a face centered cubic crystal lattice structure of the rock salt type; (c) have six {100} faces; (d) contain from 95 to 99.5 mole percent bromide ions and from 0.5 to 5 mole percent iodide ions, based on silver; (e) contain in the face centered cubic crystal lattice structure from 5.times.10.sup.-8 to 1.times.10.sup.-6 mole per silver mole of an iridium dopant comprised of Ir.sup.+3 ions forming coordination bonds with at least five halide ions occupying adjacent crystal lattice positions; and (f) contain in the face centered cubic crystal lattice structure from 1.times.10.sup.-5 to 3.times.10.sup.-4 mole per silver mole of a speed enhancing dopant comprised of divalent Group 8 metal ion chosen from among Fe.sup.+2, Ru.sup.+2 and Os.sup.

Abstract: Silver halide photographic emulsions may be sensitized by the use of hydrido-phosphine noble metal compounds and especially platinum (II) compounds.

Abstract: A silver halide photographic photosensitive material comprises an emulsion layer which includes silver halide grains having a silver chloride content of at least 50 mol % and containing a rhodium compound. The material also comprises, (i) a hydrazine derivative according to formula (1), (2) or (3) which formulas are shown and defined in the specification, and (ii) at least one compound selected from colloidal silica and polyacrylamide derivatives. The material further comprises a protective layer, the outermost layer of which has a dynamic friction coefficient is not more than 0.35. The material may be processed in a developer having a pH of at least 9.6 but less than 11.0.

Abstract: A silver halide color photographic light-sensitive material having at least one light-sensitive silver halide emulsion layer formed on a support containing light-sensitive silver halide grains which have been chemically sensitized by at least one of a selenium sensitizer, a gold sensitizer and a sulfur sensitizer and at least one of the layers of the material contains a compound represented by the following formula (I) and/or a compound represented by the following formula (II) in which A is a coupler residue or a redox group, L.sub.1 and L.sub.3 are divalent timing groups, L.sub.2 is a timing group with a valency of 3 or more, PUG is a photographically useful group, j and n are integers, each of 0 to 2, m is 1 or 2, s is 2 or a greater integer obtained by subtracting 1 from the valence of L.sub.2, L.sub.4 is --OCO-- group, and L.sub.5 is a group which releases PUG by electron transfer along a conjugated system.Formula (I)A'--(L.sub.1).sub.j --(L.sub.2).sub.m --[(L.sub.3).sub.n --PUG].sub.8Formula (II)A--L.