Abstract: A silver halide photographic material containing silver halide grains onto which a sensitizing dye in the first layer and a sensitizing dye or dyes in the second or after layers are multilayer-adsorbed, wherein the fluorescence life time of the dye or dyes in the second or after layers on the silver halide grain surface measured at a maximum wavelength of fluorescence spectrum is shorter than the fluorescence life time of the dye or dyes in a gelatin dry film measured at a maximum wavelength of fluorescence spectrum when the sensitizing dyes are multilayer-adsorbed onto the silver halide grain surface.

Abstract: A method of sensitizing a silver halide emulsion comprises the steps of:a) forming a co-dispersion of a first sensitizing dye and a second sensitizing dye in an aqueous medium, wherein the peak absorptance of the second dye is at least 10 nm different from the peak absorptance of the first dye, and wherein the ratio of the first dye to the second dye is from about 0.1 to 20; andb) incorporating the resulting co-dispersion in a silver halide emulsion.

Abstract: Disclosed is a silver halide photographic material comprising a support having provided thereon at least one silver halide emulsion layer comprising a substantially surface-latent-image-type silver halide emulsion which comprises hole-injection-type sensitizing dye(s) in an amount of 4.times.10.sup.-4 mol or more per mol of silver in the emulsion and further comprises supersensitizing compound(s), wherein the hole-injection-type sensitizing dye and the supersensitizing compound satisfy the requirements defined herein. The photographic material, thus comprising at least one silver halide emulsion that has been spectrally sensitized with a large amount of sensitizing dyes in a wavelength range longer than 545 nm and has been further sensitized by reduction sensitization, has a much increased sensitivity, while being fogged poorly, and has excellent storage stability.

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 silver halide photographic light-sensitive material in which silver halide grains contain rhodium salt and not more than 4 mol % of silver iodide, and at least one of spectral sensitizing dyes represented by formula 1 is added before the commencement of chemical ripening, is disclosed. ##STR1## Z.sub.1 and Z.sub.2 represent ring forming groups with non-metallic atoms i.e. a pyrroline, thiazoline, thiazole, benzothiazole, naphthothiazole, selenazole, benzoselenazole, naphthoselenazole, oxazole, benzooxazole, naphthooxazole, imidazole, benzimidazole or a pyridine group. Each group is unsubstituted or substituted with a halogen atom, a lower alkyl group, a lower alkoxy group or a phenyl group; R.sub.1 and R.sub.2 each represent a lower alkyl group, a hydroxyalkyl group, a carboxylalkyl group or a sulfoalkyl group; R.sub.3, when n.sub.3 is 1, represents a lower alkyl group or a hydrogen atom, while, when n.sub.3 is zero, represents a hydrogen atom; n.sub.1 and n.sub.2 each is 0 or 1; n.sub.3 is 0 or 1; X.sup.

Abstract: A silver halide photographic material has on a support at least one light-sensitive silver halide emulsion layer which comprises silver halide emulsion grains having a chloride content: of at least 50 mol % and containing a metal selected from rhodium, ruthenium and rhenium in an amount of at least 10.sup.-8 mole per mole of silver, said silver halide emulsion being spectrally sensitized with a compound of general formula (I) and being chemically sensitized with a selenium or tellurium compound: ##STR1## wherein Z and Z.sub.1 each represents a group of nonmetallic atoms necessary to complete a 5- or 6-membered nitrogen-containing heterocyclic nucleus; R and R.sub.1 each represents an unsubstituted or substituted alkyl group, or an unsubstituted aryl group; Q and Q.sub.1 each represents a group of atoms necessary to complete a 4-thiazolidinone, 5-thiazolidinone or 4-imidazolidinone nucleus; L, L.sub.1 and L.sub.2 each represents an unsubstituted or substituted methine group; n.sub.1 and n.sub.

Abstract: A silver halide photographic material comprises a silver halide emulsion layer provided on a support. In the photographic material of the present invention, the silver halide emulsion layer contains a tellurium compound represented by the formula (I) or (II): ##STR1## in which each of R.sup.11 and R.sup.12 is --OR.sup.13, --NR.sup.14 R.sup.15, --SR.sup.16 or hydrogen; R.sup.11 and R.sup.12 may be combined with each other to form a heterocyclic ring; each of R.sup.21 and R.sup.22 is an alkyl, alkenyl, alkynyl, aralkyl, aryl or heterocyclic group, --OR.sup.23, --NR.sup.24 R.sup.25, --SR.sup.26 or hydrogen; R.sup.21 and R.sup.22 may be combined with each other to form a heterocyclic ring; each of X.sup.1 and X.sup.2 is oxygen, sulfur or .dbd.NR.sup.17 ; each of X.sup.3 and X.sup.4 is oxygen, sulfur or .dbd.NR.sup.27 ; each of R.sup.13, R.sup.14, R.sup.15, R.sup.16, R.sup.17, R.sup.23, R.sup.24, R.sup.25, R.sup.26 and R.sup.27 is an alkyl, alkenyl, alkynyl, aralkyl, aryl or heterocyclic group or hydrogen; R.sup.

Abstract: A novel silver halide photographic material comprising at least one silver halide emulsion layer on a support is provided, characterized in that said emulsion layer comprises (i) silver halide grains which are at least 80 mol % silver chloride, (ii) at least one thiocyanate, (iii) at least one cyanine dye represented by general formula (I) and (iv) at least one compound represented by general formula (II), (III) or (IV): ##STR1##

Abstract: A silver halide color photographic light-sensitive material is disclosed. The light-sensitive material comprises a support having thereon a silver halide emulsion layer containing silver halide grains each containing an iridium compound and a compound containing iron, cobalt, nickel, ruthenium, rhodium, palladium, osmium or platinum; elemental sulfur; and two kinds of specified monomethine cyanine sensitizing dyes. The light sensitive material is improved in the reciprocity law failure property and the sensitivity fluctuation due to variation of atmosphere humidity.

Abstract: Supersensitization of silver halide emulsions is effected by the addition of a metal chelating agent after chemical sensitization or a combination of phenylmercaptotetrazoles and a metal chelating agent to a spectrally sensitized emulsion. The contrast of the emulsion may also be increased by the addition of this combination of materials after chemical and spectral sensitization.

Abstract: A spectrally sensitized silver halide photographic emulsion is disclosed, which comprises at least one alkali metal sulfite compound and at least one ascorbic acid compound.

Abstract: High contrast negative acting silver halide emulsions suitable for laser scanning applications comprising a Group VIII metal compound and one or more spectrally sensitizing dyes of the formula ##STR1## The emulsions have good long term stability and good sensitivity.

Abstract: A silver halide color photographic material improved in sensitivity, gradiation and maximum density when the material is treated with a rapid processing. The silver halide color photographic material comprises a support and photograhic component layers including at least one silver halide emulsion layer comprising (a) silver halide grains comprising not less than 80 mol % of silver chloride, (b) a gold compound in an amount of from 5.times.10.sup.-7 to 5.times.10.sup.-3 mol per mol of silver halide contained in said silver halide emulsion layer, (c) a sulfur sensitizer and (d) a spectral sensitizing dye represented by the following general formula [I]: ##STR1## wherein X.sub.1, X.sub.2, X.sub.3 and X.sub.4 are a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryl group or a hydroxy group, respectively; R.sub.1 and R.sub.2 are an alkyl group, respective;y X.sup..crclbar. is a counter anion and n is 0 or 1.

Abstract: Disclosed is a light sensitive material for lithographic printing plate which comprises a support and at least a silver halide emulsion layer and a surface physical development nuclei layer provided on said support wherein said silver halide emulsion layer contains at least one of the sensitizing dyes represented by the following general formulas (I), (II), (III), (IV) and (V):General formula (I) ##STR1## General formula (II) ##STR2## General formula (III) ##STR3## General formula (IV) ##STR4##

Abstract: A silver halide color light sensitive material with a silver iodobromide photographic emulsion layer is described. The silver iodobromide photographic emulsion contains at least one compound represented by the general formula (I): ##STR1## and at least one compound represented by the general formula (II): ##STR2## (in the general formulae (I) and (II), all symbols are as defined in the appended claims). The surface of silver iodobromide grains of the surface low iodine content type in the photographic emulsion is adsorbed from 10.sup.-7 to 10.sup.-3 mol of iodide ion per mol of silver halide. The silver iodobromide emulsion is spectrally sensitized in a red region without causing any undesirable problems.

Abstract: A silver halide photographic light-sensitive material comprising a support having thereon a silver halide emulsion layer which comprises silver halide grains containing at least silver chloride and spectrally sensitized to infrared rays with at least one dye selected from a tricarbocyanine dye and a dicarbocyanine dye having a 4-quinoline nucleus, wherein the silver halide emulsion layer contains from 0.0003 mol to 0.01 mol per mol of silver of a water-soluble bromide.The silver halide photographic light-sensitive material has high sensitivity in an infrared spectral region which does not substantially change during the preservation of the photographic light-sensitive material.

Abstract: A silver halide photographic material for use in flash exposure of less than 1/10000 second comprising 10.sup.-8 to 5.times.10.sup.-7 moles/moles of silver halide of at least one compound belonging to Group VIII of the Periodic Table and at least one of the sensitizing dyes of the following formulas (I) or (II) and which is capable of sensitizing silver halide at less than 550 nm: ##STR1## wherein R, R.sub.1, R.sub.2, R.sub.3, Q, X.sup.(-), Z, Z.sub.1, Z.sub.2, n, n.sub.1, n.sub.2 and n.sub.3 are as defined in the specification.