Abstract: Disclosed is a silver halide photographic light-sensitive material which comprises a support and at least one silver halide emulsion layer formed on the support. The emulsion layer contains at least one silver halide emulsion which is a tellurium-sensitized monodispersed emulsion.

Abstract: Disclosed herein is a silver halide photographic light-sensitive material comprising at least one layer made of a silver halide emulsion comprising a dispersion medium and silver halide grains dispersed in the dispersion medium. Each of the silver halide grains contains a metal or metal ions other than silver. The emulsion has been chemically sensitized in the presence of a tellurium compound which has a pseudo-first order reaction rate constant k of 1.times.10.sup.-8 to 1.times.10.sup.-0 min.sup.-1. The metal is at least one polyvalent metal selected from the group consisting of Ir, Rh, Pd, Ru, Pt, Os, Fe, Ni and Co. The metal ions are ammonium salt, acetate, nitrate, sulfate, phosphate, hydroxide, or complex salt of the metal. Telluroketones or phosphinetellurides is used as the tellurium compound. It is desirable that the silver halide emulsion is a monodispersed emulsion having a variation coefficient of 22% or less.

Abstract: Disclosed herein is a silver halide emulsion which contains grains made of silver chloroiodobromide, silver iodobromide, or silver chlorobromide, each of said grains having at least one dislocation line and chemically sensitized with a tellurium sensitizer which has a pseudo-first order reaction rate constant k of 1.times.10.sup.-8 to 1.times.10.sup.0 min.sup.-1. Also disclosed herein is a silver halide photographic light-sensitive material which comprises at least one layer made of the silver halide emulsion, in which the grains occupying at least 50 wt % of said emulsion layer.

Abstract: A silver halide photographic material comprises a silver halide emulsion layer provided on a support. The silver halide emulsion layer contains a heterocyclic selenium or tellurium compound represented by the formula (Ia), (Ib), (Ic) or (Id): ##STR1## in which each of Ch.sup.1, Ch.sup.3, Ch.sup.6 and Ch.sup.12 is Se or Te; and each of Ch.sup.2, Ch.sup.4, Ch.sup.5, Ch.sup.7, Ch.sup.8, Ch.sup.9, Ch.sup.10, Ch.sup.11, Ch.sup.13, Ch.sup.14 and Ch.sup.15 is O, S, Se or Te. Other selenium or tellurium compounds are also disclosed.

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 silver halide photographic material comprises a silver halide emulsion layer and a non-light-sensitive hydrophilic colloidal layer provided on a support. The silver halide emulsion layer or the hydrophilic colloidal layer contains a selenium compound represented by the formula (I), (II) or (III): ##STR1## in which R.sup.11 is an aliphatic, aromatic or heterocyclic group, --OR.sup.13 or --NR.sup.14 R.sup.15 ; each of R.sup.13, R.sup.14 and R.sup.15 is hydrogen or an aliphatic or aromatic group; Ch is S, Se or Te; R.sup.12 is an aliphatic, aromatic or heterocyclic group or --COR.sup.16 ; each of R.sup.16, R.sup.21 and R.sup.31 has the same meaning as that of R.sup.11 ; M.sup.1 is Ge, Sn or Pb; M.sup.2 is Ni, Pd or Pt; each of R.sup.22 and R.sup.32 is an aliphatic or aromatic group; and each of n and m is 1 or 2.

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 is sensitized with a new tellurium sensitizer. The tellurium sensitizer is represented by the formula (I) or (II): ##STR1## in which each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently is an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an aryl group, a heterocyclic group or an acyl group; at least two of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are combined with each other to form a heterocyclic ring; R.sup.5 is an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an aryl group or a heterocyclic group; R.sup.6 is --NR.sup.7 R.sup.8, --NR.sup.9 --NR.sup.10 R.sup.11 or --OR.sup.12 ; R.sup.5 and R.sup.6 may be combined with each other to form a heterocyclic ring; each of R.sup.7, R.sup.8, R.sup.9, R.sup.10, R.sup.11 and R.sup.

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 compound represented by the formula (I): ##STR1## in which each of R.sup.1, R.sup.2 and R.sup.3 independently is a group of chain structure selected from an alkyl group, an alkenyl group, an alkynyl group and an alkylthio group, each of which may have one or more substituent groups; and the number of the carbon atoms contained in the compound represented by the formula (I) is 3 to 12. A process for sulfur sensitization of a silver halide emulsion using the compound represented by the formula (I) is also disclosed.

Abstract: A silver halide photographic material composed of a support having thereon at least one silver halide emulsion layer containing substantially normal silver halide grains having a (111) plane and a (100) plane and capable of preferentially forming a latent image on the (100) plane; the (111) plane occupying at least about 40% of the surface of the grains or the (100) plane occupying more than about 60% of the surface of the grains; provided that when the (111) plane occupies at least about 40% of the surface of the grains, the grains are spectrally sensitized with (a) at least one spectral sensitizing dye selectively adsorbed more on the (100) plane than on the (111) plane, or (b) at least one spectral sensitizing dye selectively adsorbed more on the (111) plane than on the (100) plane.

Abstract: In a silver halide photographic light-sensitive material having at least one silver halide emulsion layer on a support, light-sensitive silver halide grains contained in the silver halide emulsion layer have been subjected to selenium sensitization, and the silver halide emulsion layer or another hydrophilic colloid layer which is in a water-permeable relationship with the silver halide emulsion layer contains at least one compound represented by formula (I) (wherein Z represents a heterocyclic ring directly or indirectly having at least one substituent group selected from the group consisting of --SO.sub.3 M, --COOR.sub.1, --OH, and --NHR.sub.2, M represents hydrogen, alkali metal, quaternary ammonium, or quaternary phosphonium, R.sub.1 represents hydrogen, alkali metal, or alkyl having 1 to 6 carbon atoms, R.sub.2 represents hydrogen, alkyl having 1 to 6 carbon atoms, --COR.sub.3, --COOR.sub.3, or --SO.sub.2 R.sub.3, and R.sub.

Abstract: A silver halide photographic material low in fogging generation and high in sensitivity comprising a silver halide emulsion selenium sensitized with at least one compound selected from the group consisting of compounds represented by general formulae (I) and (III): ##STR1## wherein each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represents an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an aryl group, a heterocyclic group, an acyl group, a carboxyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group or a sulfamoyl group, provided that a tetramethylselenourea is excluded; ##STR2## wherein each of R.sub.8, R.sub.9, R.sub.10 and R.sub.

Abstract: There is disclosed a silver halide photographic material which is sensitized with a novel selenium sensitizer. It provides less fog and markedly little sensitivity degradation during storage under a high temperature and humidity conditions, while providing the same level of a sensitivity. The silver halide photographic material contains at least one compound represented by the following Formula (I): ##STR1## Wherein R.sub.1 represents a substituted phenyl or condensed aryl group, an aliphatic group, a heterocyclic group, OR.sub.4, --NR.sub.5 (R.sub.6), SR.sub.7, SeR.sub.8, X.sub.1, or a hydrogen atom; R.sub.2 and R.sub.3 each represents an aliphatic group, an aromatic group, a heterocyclic group, OR.sub.9, --NR.sub.10 (R.sub.11), SR.sub.12, SeR.sub.13, X.sub.2, or a hydrogen atom; R.sub.5, R.sub.6, R.sub.10 and R.sub.11 each represents an aliphatic group, an aromatic group, a heterocyclic group, or a hydrogen atom; R.sub.4, R.sub.7, R.sub.8, R.sub.9, R.sub.12 and R.sub.

Abstract: A silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer wherein the silver halide emulsion contains a salt of a metal ion of which the atomic number is at least 21 alone or together with a chelating agent and wherein the silver halide emulsion has been chemically sensitized in the presence of a chemical sensitization promoter comprising at least one of a silver halide solvent and an adsorbable compound.

Abstract: A silver halide photographic light-sensitive material of this invention is a silver halide photographic light-sensitive material having at least one silver halide emulsion layer on a support, wherein at least one of the silver halide emulsion layers contain at least one compound represented by formula (I): formula (I) ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 each represent an aliphatic group, an aromatic group, a heterocyclic group, OR.sub.4, NR.sub.5 (R.sub.6), SR.sub.7, OSiR.sub.8 (R.sub.9)(R.sub.10), TeR.sub.11, X, or a hydrogen atom, R.sub.4, R.sub.7, and R.sub.11 each represent an aliphatic group, an aromatic group, a heterocyclic group, a hydrogen atom, or a cation, R.sub.5 and R.sub.6 each represent an aliphatic group, an aromatic group, a heterocyclic group, or a hydrogen atom, R.sub.8, R.sub.9, and R.sub.10 each represent an aliphatic group, and X represents a halogen atom.

Abstract: A silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer, characterized in that at least one silver halide emulsion layer contains at least one compound represented by the following general formula (I), (II) or (III): ##STR1## wherein Q, X, Y, Z.sub.1, Z.sub.2, A, T.sub.1, T.sub.2 and T.sub.3 are as defined in the specification.

Abstract: The present invention provides (1) a method for preparation of a photographic silver halide emulsion containing tabular silver halide particles having a particle diameter larger than the particle thickness by three times or more, wherein least one oxidizing agent selected from a hydrogen peroxide, a salt of a peroxy acid and an ozone is added to the emulsion before the termination of chemical ripening thereof and then a reducing agent is added thereto, and (2) a silver halide photographic material which has at least one or more layers comprising a tabular silver halide particle-containing emulsion wherein tabular silver halide particles are those prepared by method (1). The present tabular silver halide particle-containing emulsion has high sensitivity and good granularity and is substantially free from fog.

Abstract: A silver halide photographic material is disclosed, which contains at least one compound represented by general formula (I) or general formula (II):Z--R-Se--R'--Z' (I)Z--R--Se--R" (II)where R and R' each individually represent bivalent groups composed of at least one of the following types of atoms carbon atoms, nitrogen atoms, oxygen atoms, sulfur atoms, and selenium atoms; Z and Z' each individually represent a hydroxyl group, an amino group, an ammonium group, a carboxylic acid group, a salt of a carboxylic acid group, a sulfonic acid group, a salt of a sulfonic acid group, an ether group, a thioether group, a selenoether group, a ureido group, a thioureido group, an oxycarbonylamino group, an acyl group, a sulfonyl group, a carbamoyl group, a carboxamido group, a sulfamoyl group a sulfonamido group, an acyloxy group, a sulfonyloxy group, an oxycarbonyl group, an oxysulfonyl group, or a heterocyclic group; and R" represents an alkyl group, an cycloalkyl group, an alkenyl group, an aralkyl group, or aryl gr

Abstract: A silver halide photographic emulsion is subjected to sulfur or gold-sulfur sensitization in the presence of a combination of (1) at least one of an organic thioether compound or a tetrasubstituted thiourea and (2) a nitrogen-containing heterocyclic compound, to achieve the prevention of pressure desensitization and safelight aptitude deterioration.

Abstract: A silver halide photographic material is disclosed which comprises at least one silver halide emulsion layer on a support, wherein light-sensitive silver halide grains in the silver halide emulsion layer or layers are obtained by charging previously prepared silver halide particles having a fine size into a reaction vessel which allows nucleation and/or crystallization of the light-sensitive silver halide grains so that nucleation and/or crystallization are effected in the reaction vessel, and the light-sensitive silver halide grains are subjected to chemical ripening in the presence of a silver halide solvent. A process for the preparation of the silver halide photographic material is also disclosed.

Abstract: A silver halide photographic emulsion containing silver halide grains having (III) faces, at least 50% (by projected area) of which are(a) silver halide grains controlled so that the development thereof is initiated at the corners or in the vicinity of the corners of the grains, and/or(b) silver halide grains controlled so that the development thereof is initiated at the edges or in the vicinity of the edges of the grains.