Abstract: A detector can detect an analyte including a carbon-carbon multiple bond moiety and capable of undergoing Diels-Alder reaction with a heteroaromatic compound having an extrudable group. The detector can detect, differentiate, and quantify ethylene.

Abstract: Disclosed is a silver halide photographic material which comprises at least one methine dye represented by the following formula (I): wherein Y represents a furan ring or a pyrrole ring, and Y may further be condensed with other 5- or 6-membered carbocyclic ring or heterocyclic ring, or may have a substituent; the bond between two carbon atoms in which Y is condensed may be a single bond or a double bond; Z represents an atomic group necessary to form a 5- or 6-membered nitrogen-containing heterocyclic ring, and Z may further be condensed with other 5- or 6-membered carbocyclic ring or heterocyclic ring; R represents a substituted or unsubstituted alkyl group, aryl group, or heterocyclic group; D represents a group necessary to form a methine dye; L1 and L2 each represents a methine group; p represents 0 or 1; M represents a counter ion; and m represents a number of 0 or higher necessary to neutralize the charge in the molecule.

Abstract: A photothermographic material comprising a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent for a silver ion and a binder on one surface of a support, wherein a silver behenate-content of the non-photosensitive organic silver salt is 40 to 70 mol %, and the photothermographic material comprises a compound that can be one-electron-oxidized to provide a one-electron oxidation product, which further releases at least 1 electron, one of during and after a subsequent reaction.

Abstract: A silver halide photographic light-sensitive material having high sensitivity and having a desired spectral sensitivity distribution. A silver halide photographic light-sensitive material comprising at least one multichromophore dye compound having at least two dye chromophores connected by covalent bonding or coordinate bonding, at least two of the dye chromophores forming a dye chromophore group and the light absorption of the dye chromophore group differing from the sum of individual light absorptions of respective dye chromophores constituting said dye chromophore group.

Abstract: A silver halide color photosensitive material has at least one blue-sensitive silver halide emulsion layer containing a yellow coupler, at least one green-sensitive silver halide emulsion layer containing a magenta coupler, at least one red-sensitive silver halide emulsion layer containing a cyan coupler, and at least one non-lightsensitive layer, on a support. The photosensitive material contains, in at least one of the layers, a compound having a reducing group and a compound having at least three hetero atoms capable of increasing a photographic speed of the photosensitive material in comparison with the case where the material does not contain the same.

Abstract: This invention relates to a silver halide photographic material comprising at least one silver halide emulsion comprising silver halide grains having associated therewith:

Abstract: Disclosed is a silver halide photographic light-sensitive material comprising at least one silver halide emulsion layer on a support, wherein 40 mol % or more of silver halide contained in the silver halide emulsion layer is silver bromide and the silver halide contains 1×10−6 mole or more per mole of silver of a metal complex containing one or more cyanide ligands, and the silver halide photographic light-sensitive material has a characteristic curve drawn in orthogonal coordinates of logarithm of light exposure (x-axis) and optical density (y-axis) using equal unit lengths for the both axes, on which gamma is 4.0 or more for the optical density range of 0.1-1.5. There is provided a silver halide photographic light-sensitive material showing high contrast and high sensitivity.

Abstract: A silver halide emulsion comprises an electron-releasing compound of Types 1 to 4: (Type 1) a compound capable of undergoing a one-electron oxidation (1-EO) to form a one-electron oxidation product (1-EOP), the 1-EOP capable of releasing further two or more electrons accompanying a subsequent bond cleavage reaction, (Type 2) a compound capable of undergoing 1-EO to form 1-EOP, the 1-EOP capable of releasing further one electron accompanying a subsequent bond cleavage reaction, and having, in its molecule, two or more adsorptive groups acting on silver halides, (Type 3) a compound capable of undergoing 1-EO to thereby form 1-EOP, the 1-EOP capable of releasing further one or more electrons after going through a subsequent bond forming process, and (Type 4) a compound capable of undergoing 1-EO to form 1-EOP, the 1-EOP capable of releasing further one or more electrons after going through a subsequent intramolecular ring cleavage reaction.

Abstract: A heat-developable photosensitive material comprises: a support; a photosensitive silver halide; a non-photosensitive organic silver salt; a reducing agent for a silver ion; a binder; and a compound having specified structure.

Abstract: A silver halide photographic material having high sensitivity, low fog and good shelf life (i.e., storage stability), which comprises at least one kind of merocyanine dye represented by formula (I): wherein Z1 represents an atomic group necessary for forming a naphthoxazole ring, R1 and R2 each represents an unsubstituted or substituted alkyl group, an aryl group or a heterocyclic group, L1, L2, L3 and L4 each represents a methine group, M1 represents a charge neutralizing counter ion, and m1 is a number of 0 or more necessary for neutralizing a charge in a molecule.

Abstract: A silver halide photographic light-sensitive emulsion comprising a silver halide and a compound represented by the following Formula (I): 1

Abstract: A silver halide photographic light-sensitive material is disclosed, comprising a support having thereon at least one light-sensitive silver halide emulsion layer, wherein said emulsion layer contains a compound represented by the following formula (1):

Abstract: Methine dye compounds represented by formula (1) and highly sensitive silver halide photographic materials containing these compounds:

Abstract: A black-and-white photothermographic material that is sensitive at a wavelength greater than 700 nm, and comprises a support having thereon one or more thermally-developable imaging layers comprising a binder and in reactive association, a photosensitive silver halide, a non-photosensitive source of reducible silver ions, and a reducing composition for the non-photosensitive source reducible silver ions. The thermally-developable layers further comprises one or more indolenine dyes as post-processing stabilizing compounds and one or more merocyanine dyes or cyanine spectral sensitizing dyes that comprise one or more thioalkyl, thioaryl, or thioether groups.

Abstract: This invention comprises a silver halide photographic material comprising at least one silver halide emulsion comprising silver halide grains having associated therewith a combination of two or more dyes comprising: (a) a first dye which is a cyanine dye of formula Ia and has a net charge of zero or −1  wherein the substituents are as defined in the specification; (b) a second dye which has at least one substituent that has a positive charge, and is a cyanine dye a merocyanine dye, arylidene dye, complex cyanine dye, complex merocyanine dye, homopolar cyanine dye, hemicyanine dye, styryl dye, hemioxonol dye, oxonol dye, anthraquinone dye, triphenylmethane dye, azo dye type, azomethines, or a coumarin dye, with the proviso that if the second dye is a cyanine dye, it is of formula IIa:  wherein the substituents are as defined in the specification; and wherein (c) the wavelength of maximum light absorption, in nanometers (nm), of the first dye and the wavele

Abstract: A high-sensitive silver halide photographic light-sensitive material is provided.

Abstract: This invention comprises a multicolor photographic element comprising a support bearing a cyan dye image-forming unit comprising at least one red-sensitive silver halide emulsion layer having associated therewith at least one cyan dye-forming coupler, a magenta dye image-forming unit comprising at least one green-sensitive silver halide emulsion layer having associated therewith at least one magenta dye-forming coupler, a yellow dye image-forming unit comprising at least one blue-sensitive silver halide emulsion layer having associated therewith at least one yellow dye-forming coupler, wherein at least one of said layers comprises large tabular grains having an average circular diameter of greater than 2 &mgr;m and contains a fragmentable electron donating compound is of the formula: X—Y′ or a compound which contains a moiety of the formula —X—Y′; wherein X is an electron donor moiety, Y′ is a leaving proton H or a leaving group Y, with the proviso that if Y′ is a pr

Abstract: A multicolor photographic element comprising a support bearing a cyan dye image-forming unit comprising at least one red-sensitive silver halide emulsion layer having associated therewith at least one cyan dye-forming coupler, a magenta dye image-forming unit comprising at least one green-sensitive silver halide emulsion layer having associated therewith at least one magenta dye-forming coupler, a yellow dye image-forming unit comprising at least one blue-sensitive silver halide emulsion layer having associated therewith at least one yellow dye-forming coupler, wherein at least one of said silver halide emulsion layers contains a tabular grain silver halide emulsion having a halide content of at least 95% bromide and less than about 5% iodide, said iodide being substantially uniformly distributed in the silver halide grains of said emulsion, and said emulsion is sensitized with a fragmentable electron donor of the formula X—Y′ or an electron donor which contains an —XY′ moiety; wherein

Abstract: A method of processing a silver halide photographic material is disclosed, comprising on a support a light sensitive silver halide emulsion layer, wherein the light-sensitive layer contains a spectral-sensitizing dye represented by formula (1-a); a developer solution contains a developing agent represented by formula (A); and the replenishing rate of a processing solution is determined based on the proportion of an exposed area per unit area of the photographic material to perform replenishment.

Abstract: A heat-developable photosensitive material comprises: a support; a photosensitive silver halide; a non-photosensitive organic silver salt; a reducing agent for a silver ion; a binder; and a compound having specified structure.

Abstract: Disclosed is a compound represented by the following formula (I): 1

Abstract: A silver halide photographic material having high sensitivity, low fog and good shelf life (i.e.

Abstract: A Silver halide photographic material high in sensitivity and decreased in residual color is disclosed, which comprises at least one compound represented by the following formula (I): wherein Z1 represents an oxygen atom, a sulfur atom, a selenium atom, a tellurium atom, a carbon atom or a nitrogen atom; Q represents a group necessary for forming a methine dye; M1 represents a charge equilibrium counter ion; m1 represents the number necessary for neutralizing a charge of the molecule; Vp represents a group having a log P value lower than that of Cl; q1 represents 1, 2, 3 or 4; and R1 is represented by following: R1=(La)k1CONHSO2R11, R1=(Lb)k2SO2NHCOR12, R1=(Lc)k3CONHCOR13, R1=(Ld)k4SO2NHSO2R14 wherein R11, R12, R13 and R14 each represents an alkyl group, an aryl group, a heterocyclic group, an alkoxyl group, an aryloxy group, a heterocyclyloxy group or an amino group; La, Lb, Lc and Ld each represents a methylene group; and k1, k2, k3 a nd k4 each represents a

Abstract: A silver halide photographic emulsion is disclosed, which comprises at least one dye or sensitizing dye having at least one organic counter ion; and also a silver halide photographic emulsion layer containing the above dye or sensitizing dye and a method of producing the above silver halide photographic emulsion are disclosed.

Abstract: A method of processing a silver halide photographic material is disclosed, comprising on a support a light sensitive silver halide emulsion layer, wherein the light-sensitive layer contains a spectral-sensitizing dye represented by formula (1-a); a developer solution contains a developing agent represented by formula (A); and the replenishing rate of a processing solution is determined based on the proportion of an exposed area per unit area of the photographic material to perform replenishment.

Abstract: Disclosed is a compound represented by the following formula (I): wherein Z1 represents an atomic group necessary to form a 5- or 6-membered nitrogen-containing heterocyclic ring; Z2 represents an atomic group necessary to form a 5- or 6-membered heterocyclic ring, Z2 may further be substituted, or may be condensed with a hetero ring or a benzene ring; R1 represents a hydrogen atom, a halogen atom, a mercapto group, an alkyl group, an alkenyl group, an aryl group, an alkylthio group, an alkenylthio group, or an arylthio group; L1 and L2 each represents a methine group; p1 represents 0 or 1; V1 represents a substituent; and n represents 0, 1 or 2, and when n represents 2, a plurality of V1 may be the same or different.

Abstract: This invention comprises a silver halide photographic material comprising at least one silver halide emulsion comprising silver halide grains having associated therewith a combination of two or more dyes wherein (b) (a) a dye having at least one substituent that has a negative charge is present, a dye having at least one substituent that has a positive charge is present, wherein at least one of the dyes is further substituted with at least one hydrogen bonding donor substituent. In a preferred embodiment, at least one of the dyes is substituted with at least two hydrogen bonding donor substituents. In another preferred embodiment a silver halide photographic material comprises at least one silver halide emulsion comprising silver halide grains having associated therewith a dye substituted with at least one guanidinium, amidinium, or imine of urea substituent.

Abstract: The present invention relates to the use of dye-stuffs of the general formula I in which R1, R2 and R3 and M• are as defined in claim 1, as infra-red-absorbing agents in hydrophilic colloidal layers, for example in recording materials or for detection purposes, recording materials, for example photographic recording materials, which comprise such dyestuffs in hydrophilic colloidal layers, and new dyestuffs of the general formula I.

Abstract: The present application provides cyanine dyes of the formula (I) in which R1, R2, R3, R4, R5 and R6 mutually independently denote a substituent, providing that at least one of the residues R1, R2, R3 denotes an indolyl substituent, X denotes O, S, Se, NR9, CH═CH or C(CH3)2, wherein R9 denotes a optionally substituted alkyl residue, R7, R8 mutually independently denote alkyl, sulfoalkyl, carboxyalkyl, —(CH2)1—SO2−Y—SO2—alkyl, —(CH2)1—SO2—Y—CO—alkyl, —(CH2)1—CO—Y—SO2—alkyl, —(CH2)1—CO—Y—O—alkyl or —(CH2)1—NH—SO3&thgr;, —(CH2)1—N(alkyl)—SO3&thgr; or —(CH2)1—N(aryl)—SO3&thgr;, providing that l=1 to 6 and Y means NH or N−, n means 1, 3, 5, 7, L denotes a substituted or unsubstituted methine group, which may be a constituent of one or more carbocyclic rings, and M denotes a counterion optionally necess

Abstract: This invention comprises a photographic element comprising a support and at least one silver halide emulsion layer in which the silver halide is sensitized with a compound of the formula:Q-XYwherein Q represents the atoms necessary to form a chromophore comprising an amidinium-ion, a carboxyl-ion or dipolar-amidic chromophoric system when conjugated with XY, and XY is a 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;2) 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.cndot. has an oxidation potential <-0.7V.

Abstract: An electrophotographic photoconductor including an electroconductive substrate, and a charge generating layer including a charge generating material and a charge transporting layer including a charge transporting material, which are overlaid and which are formed overlying one side of the electroconductive substrate, wherein the charge generating material includes an asymmetric disazo pigment and a metal-free phthalocyanine pigment, and wherein a ratio of the asymmetric disazo pigment to the metal-free phthalocyanine pigment is from 1.5:1 to 5:1 by weight and the asymmetric disazo pigment has the following formula (I):Cp1--N.dbd.N--A--N.dbd.N--Cp2 (I)wherein A represents a divalent group which is connected to each nitrogen atom of the adjacent azo groups through a carbon atom of said A group; and Cp1 and Cp2 independently represents a residual group of a coupler, wherein Cp1 is different from Cp2.

Abstract: A method of manufacturing an organic pigment including the steps of providing an organic pigment wet cake which includes at least an organic pigment and a solvent and drying the organic pigment wet cake while the wet cake is heated at a temperature higher than room temperature to prepare a powder of the organic pigment, wherein the organic pigment is present in the organic pigment wet cake in an amount of not greater than about 70% by weight.

Abstract: An electrophotographic photoconductor has an electroconductive support, and a photoconductive layer formed thereon which contains at least one bisazo compound of formula (I): ##STR1## wherein Cp.sup.1 and Cp.sup.2 are each a coupler radical which may be the same or different. Further, these are disclosed a bisazo compound of formula (II), and raw materials thereof, that is, 1,4-bis[4-(4-nitrophenyl)-1,3-butadienyl]benzene of formula (V), 1,4-bis[4-(4-aminophenyl)-1,3-butadienyl]benzene of formula (VI) and a bis(diazonium salt) compound of formula (III).

Abstract: An electrophotographic photoconductor has an electroconductive support, and a photoconductive layer formed thereon containing an azo pigment of formula (1): ##STR1## wherein R.sup.201 and R.sup.202 are each a hydrogen atom, a halogen atom, an alkyl group, an alkoxyl group or cyano group; and Cp.sup.1 and Cp.sup.2 are each independently a coupler radical represented by formula (2): ##STR2## in which R.sup.203 is a hydrogen atom, an alkyl group or an aryl group; R.sup.204 to R.sup.208 are each a hydrogen atom, nitro group, cyano group, a halogen atom, an alkyl group, trifluoromethyl group, an alkoxyl group, a dialkylamino group, or hydroxyl group; and Z is an atomic group which constitutes a substituted or unsubstituted aromatic hydrocarbon ring, or a substituted or unsubstituted aromatic heterocyclic ring, the azo pigment showing a diffraction peak at a Bragg angle of 26.5.+-.0.8.degree. in the X-ray diffraction spectrum with respect to Cu--K.alpha. ray, and a half-width of 2.degree.

Abstract: A photothermographic recording material comprising a photo-addressable thermally developable element including a substantially light-insensitive organic silver salt, photosensitive silver halide in catalytic association with the substantially light-insensitive organic silver salt, in a quantity of 0.1 to 35 mol % relative to the organic silver salt and spectrally sensitized to infra-red light with a dye, a supersensitizer for the dye, a reducing agent in thermal working relationship with the substantially light-insensitive organic silver salt and a binder, wherein the binder comprises a water soluble polymer, a water-dispersible polymer or a water soluble polymer and a water-dispersible polymer and the dye is represented by formula (I): ##STR1## wherein Z.sup.1 and Z.sup.2 independently represent S, O or Se; R.sup.1 and R.sup.

Abstract: A photothermographic material containing photosensitive silver halide grains, in which a cyanine dye containing at least one of an alkylthio group, an arylthio group, and a substituent group having a thioether bond is included, thereby the photographic material exhibiting low fogging, high sensitivity, and improved stability.

Abstract: A silver halide photographic material which contains at least one methine compound represented by the following formula (I) or (II): wherein Z.sub.1, Z.sub.2 and Z.sub.3 each represents an atomic group necessary to form a 5- or 6-membered nitrogen-containing heterocyclic ring; R.sub.1 and R.sub.3 each represents an alkyl group; R.sub.2 represents a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group; L.sub.1, L.sub.2, L.sub.3, L.sub.4, L.sub.5, L.sub.6, L.sub.7, L.sub.8 and L.sub.9 each represents a methine group; p.sub.1 and p.sub.2 each represents 0 or 1; n.sub.1 and n.sub.2 each represents 0, 1, 2, 3 or 4; M.sub.1 represents a counter ion to balance a charge; and m.sub.1 represents a number of 0 or more necessary for to neutralize a charge in the molecule; provided that at least one of R.sub.1, R.sub.2, R.sub.3, Z.sub.1, Z.sub.2, Z.sub.3, L.sub.1, L.sub.2, L.sub.3, L.sub.4, L.sub.5, L.sub.6, L.sub.7, L.sub.8 and L.sub.9 has a thioether group; ##STR1## wherein Z.sub.4, Z.sub.5 and Z.sub.

Abstract: A highly sensitive silver halide photographic material is described, which comprises at least one light-sensitive silver halide emulsion layer comprising at least one hemicyanine, hemioxonol, bishemicyanine or bishemioxonol dye having a particular structure and silver halide grains having an aspect ratio of from 3 to 50 or which comprises at least one light-sensitive silver halide emulsion layer comprising at least one bishemicyanine dye having a particular structure and silver halide grains at least 50%, based on projected area, of which are grains having a silver chloride content of at least 50 mole % and an outer surface at least 50% of which is constituted of (111) faces.

Abstract: There is disclosed a silver halide photographic light-sensitive material having at least one silver halide emulsion layer on a support, wherein the silver halide grains in at least one of the emulsion layers are subjected to reduction sensitization, and at least one of the emulsion layers contains at least one compound represented by general formula (I): ##STR1## wherein R represents a sulfonylalkenyl group; L.sub.1 and L.sub.2 each represent a methine group; p.sub.1 is 0 or 1; Z.sub.1 represents a group of atoms required to form a 5- or 6-membered nitrogen-containing heterocycle; M.sub.1 represents a counter ion for balance of a charge; m.sub.1 is a number of from 0 to 10 required to neutralize a charge of the molecule; and Q represents a methine or polymethine group substituted with a heterocyclic or aromatic group. The material has high sensitivity, low fog, and excellent storage stability.

Abstract: A silver halide photosensitive material is described, which comprises at least one of the compounds represented by the following formula (I) ##STR1## wherein Z.sub.1 and Z.sub.2 each represents an atomic group necessary for forming a five- or six-membered nitrogen-containing heterocyclic ring, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represents an alkyl group, an aryl group or a heterocyclic group, Q represents a divalent linking group or a single bond, with the proviso that at least one of R.sub.1, R.sub.2, R.sub.3, R.sub.4 and Q is substituted with a water-soluble group, L.sub.1, L.sub.2, L.sub.3, L.sub.4, L.sub.5, L.sub.6, L.sub.7 and L.sub.8 each represents a methine group, n.sub.1 and n.sub.2 each is 0, 1, 2, 3 or 4, p.sub.1 and p.sub.2 each is 0 or 1, M.sub.1 represents a charge equilibrium counter ion, and m.sub.1 is a number of from 0 to 10, which is necessary for neutralizing charge of the molecule.

Abstract: A photothermographic material has a photosensitive layer containing a binder, organic silver salt, reducing agent, and silver halide on one surface of a support. The photosensitive layer further contains a specific sulfur-containing compound and a merocyanine dye of specific structure and has an absorbance of 0.15-1.0 at an exposure wavelength. Sharpness, sensitivity, and aging stability are improved.

Abstract: There is disclosed a silver halide light-sensitive material which contains a methine compound represented by general formula (1):General formula (1) ##STR1## wherein A1, A2, and A3 each represent a streptocyanine dye; L1, L2, L3, and L4 each represent a divalent linking group, and n1 represents an integer of not less than 0. The light-sensitive material exhibits high absorptivity.

Abstract: A silver halide photographic material comprising a support having thereon at least one light-sensitive silver halide hydrophilic colloid emulsion layer, at least one light-insensitive hydrophilic colloid layer interposed between the support and at least one silver halide emulsion layer, and at least one hydrazine derivative selected from the group consisting of compounds represented by the general formula (1) and (2) contained in the at least one of hydrophilic colloid layers provided in the same side of the support as that coated with the light-sensitive silver halide hydrophilic colloid emulsion layer: ##STR1## wherein their substituents are defined in the specification.

Abstract: A silver halide photographic light-sensitive material is disclosed. The material comprises a substrate provided thereon with at least one silver halide emulsion layer comprising at least one compound represented by the following Formula (I): ##STR1## wherein Ra and Rb each represents a hydrogen atom, an alkyl group having at least two carbon atoms or an aryl or heterocyclic group, provided that Ra and Rb do not simultaneously represent hydrogen atoms; La and Lb each represents a methylene group; L.sub.1 and L.sub.2 each represents a methine group; p.sub.1 represents 0 or 1; Z.sub.1 represents an atomic group required for forming a 5- or 6-membered nitrogen atom-containing heterocyclic ring; M.sub.1 represents a counterion required for balancing the electrical charge; m.sub.1 represents a numerical value of not less than 0 required for neutralizing the molecule; and Q represents a methine or polymethine group required for forming a methine dye.

Abstract: The present invention relates to the use of dyestuffs of the general formula I ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 and M.sup..sym. are as defined in claim 1, as infrared-absorbing agents in hydrophilic colloidal layers, for example in recording materials or for detection purposes, recording materials, for example photographic recording materials, which comprise such dyestuffs in hydrophilic colloidal layers, and new dyestuffs of the general formula I.

Abstract: A photographic element is described which comprises a silver halide emulsion having incorporated therein a latent image forming unit, said unit being comprised of an agglomeration of silver halide in conductive contact with a light absorbing center, wherein the center is comprised of:(i) an amorphous or liquid crystalline spectral sensitizing dye; or(ii) a plurality of spectral sensitizing dye crystals.Also described is a process for forming a silver halide emulsion and the emulsion prepared by such process.

Abstract: A silver halide photographic material comprising a support having provided thereon a light-sensitive silver halide emulsion layer, said silver halide photographic material contains at least one spectral sensitizing dye represented by the following formula (I): ##STR1## wherein Z.sub.11 represents a nonmetal atomic group necessary for completing a 5- or 6-membered nitrogen-containing heterocyclic ring; Q.sub.11 represents a nonmetal atomic group necessary for completing a 5-membered nitrogen-containing heterocyclic ring; R.sub.11 represents a substituted or unsubstituted alkyl group; R.sub.12 represents a straight chain or branched alkyl, alkenyl or alkynyl group each of which contains at least one carboxyl group and at least one ester bond, amido bond or ether bond; L.sub.11 and L.sub.12 each represents a methine group; m.sub.11 represents 0 or 1; m.sub.12 represents 0, 1 or 2: X.sub.1 represents a counter ion necessary for neutralizing a charge; and n.sub.

Abstract: A silver halide photographic material containing a methine compound containing a thiohydantoin ring substituted by a pyrazinyl group at the 3-position, which has high sensitivity, high reproducibility, good storage stability, and leaves hardly color on unexposed areas after being processed. Example General formula: ##STR1## wherein Z represents a group of atoms necessary to form a five- or six-membered nitrogen-containing heterocyclic ring; R.sub.1 represents an alkyl group; R.sub.2 represents a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, or a heterocyclic group; R.sub.3 represents a pyrazinyl group; L.sub.1 and L.sub.2 each represents a methine group; and n represents 0 or an integer of 1 to 3.

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 silver halide photographic material is described, which contains at least one compound represented by the following formula (I): ##STR1## wherein Z represents an atomic group necessary for forming a 5- or 6-membered nitrogen-containing heterocyclic ring, R.sub.1 represents an alkyl group, R.sub.2 represents a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group, R.sub.3 represents a nitrogen-containing 5-membered heterocyclic ring, L.sub.1 and L.sub.2 each represents a methine group and n represents 0 or an integer of 1 to 3.