Abstract: A negative type silver halide photographic material is disclosed. The material comprises a support having provided thereon at least one silver halide emulsion layer containing silver halide grains sensitized with gold and sulfur sensitizers, the emulsion layer or at least one other hydrophilic colloid layer containing at least one high contrast-imparting hydrazine derivative and at least one compound represented by the following general formula (I): ##STR1## wherein Z represents N or C--X wherein X represents a substituted or unsubstituted alkyl or aryl group, Y represents a substituted or unsubstituted alkyl or aryl group, and M represents a hydrogen atom, a metallic atom, or ammonium which may be substituted.

Abstract: Radiation sensitive thermally developable imaging elements comprise:(a) photosensitive silver halide,(b) light insensitive silver salt oxidizing agent,(c) reducing agent for silver ions, and(d) an antifoggant or speed enhancing compound comprising iodophthalazinone compounds. The antifoggants are effective in reducing spurious background image densities.

Abstract: A method for forming a direct positive image having a high Dmax and a low Dmin, which comprises image-wise exposing a photographic light-sensitive material having on a support at least one photographic emulsion layer containing unprefogged internal latent image-type silver halide grains and developing the photographic light-sensitive material after or while fogging to form direct positive image, wherein the aforesaid development is performed in the existence of at least one compound selected from the group consisting of compounds represented by formula (I), (II), (III), (IV), (V) or (VI), acid salts of compounds represented by formula (I) to (IV) provided substituents thereof contain an amino group, and acid salts of compound represented by formula (V) or (VI); ##STR1## wherein symbols are defined as in claim 1.

Abstract: A silver halide photosensitive material comprising a support having thereon at least one silver halide emulsion layer containing silver halide grains. These silver halide grains are obtained by subjecting the surface of silver halide grains to halogen conversion. These silver halide grains are essentially silver iodide free silver chlorobromide. They have a plurality of internal layers of different halogen compositions and contain at least one bridged pentamethine cyanine dye compound represented by the general formula (I) or (I'): ##STR1## and one compound represented by general formula (II): ##STR2## The variables in the above formulas are defined in the instant specification.

Abstract: A silver halide photographic material, which comprises a support having provided thereon at least one light-sensitive silver halide emulsion layer, the silver halide emulsion layer or at least one other hydrophilic colloid layer of the material containing at least one heterocyclic quaternary ammonium salt compound represented by the following general formula (I): ##STR1## wherein Z represents non-metallic atoms necessary for forming a 5- or 6-membered heterocyclic ring which may be substituted with a substituted group; R.sup.1 represents an aliphatic group; R.sup.2 represents a hydrogen atom, an aliphatic group, or an aromatic group; Y represents a charge-balancing counter ion; and n is 0 or 1; provided that at least one of R.sup.1, R.sup.2, and Z has an acyl group, a hydrazine group, or a hydrazone group, or R.sup.1 and R.sup.2 form a 6-membered dihydropyridinium skeleton, and at least one of R.sup.1, R.sup.2, and Z includes the group -X-L-.sub.

Abstract: A silver halide photographic material which comprises a support having thereon at least one hydrophilic colloid layer, wherein the hydrophilic colloid layer comprises (a) a binder comprising a dextran having a molecular weight of at least 100,000 and (b) an ionic polymer.

Abstract: A silver halide photographic material is disclosed, said material having silver halide emulsion layers on a support, the emulsion in said silver halide emulsion layers containing magenta coupler represented by the following formula (I), said emulsion containing silver halide grains which have a (110) plane and/or a crystal plane having an edge running through substantially the center of a (110) plane, the silver halide composition of said grains being substantially made of silver bromide and/or silver iodobromide: ##STR1## where Z represents a group of the non-metallic atoms necessary for forming a nitrogen-containing hetero ring which may have a substituent; X is a hydrogen atom or a substituent which is capable of being eliminated upon reaction with the oxidation product of a color developing agent; and R is a hydrogen atom or a substituent.

Abstract: An improved silver halide photographic material having at least one layer of a light-sensitive silver halide emulsion that is spectrally sensitized with a sensitizing dye of the following general formula (1) to light having a wavelength of 750 nm and above. Said silver halide emulsion is prepared by a process which comprises generating silver halide grains by adding a solution of a water-soluble silver salt and a solution of a water-soluble halide to a solution containing a protective colloid, aggregating the generated silver halide grains with a polymeric flocculating together with the protective colloid, and removing the dissolved matter; ##STR1## where Z.sub.1 and Z.sub.3 each represents the non-metallic atomic group necessary to form an optionally substituted benzothiazole, benzoxazole, naphthothiazole or naphthoxazole nucleus; R.sub.1 and R.sub.2 each represents a saturated or unsaturated aliphatic group; Z.sub.2 represents a 5- or 6-membered ring of carbon atoms; A represents a hydrogen atom when Z.sub.

Abstract: Direct positive photographic films are disclosed having novel density enhancers of the formula ##STR1## wherein A is oxygen or sulfur, and B is selected from the group consisting of hydrogen, alkyl haloalkyl, hydroxyalkyl, alkylamino and alkoxy. Photographic materials coated with emulsions having these density enhancers display good optical density while maintaining high speed capability.

Abstract: A silver halide photographic emulsion containing at least one compound represented by following formula (I):Dye--L--Hyd (I)wherein Dye represents a chromophore-containing dye residue shown by following formula (II); Hyd represents a hydrazine residue one of the two nitrogen atoms of which is substituted by a carbonyl group, a sulfonyl group, a sulfoxy group, a phosphoryl group, or an alkilydene group and L represents a divalent linkage group of bonding Dye and Hyd; ##STR1## wherein R and R.sub.1, which may be the same or different, each represents an alkyl group; Z and Z.sub.1, which may be the same or different, each represents an atomic group necessary for forming a 5- or 6-membered heterocyclic ring; Q represents an atomic group necessary for forming a 5- or 6-membered carbon ring or a 5- or 6-membered heterocyclic ring; A represents an oxygen atom or a sulfur atom; and n, d, and m each represents 0 or 1.

Abstract: A method of processing an imagewise exposed light-sensitive silver halide photographic material. The material contains a silver halide emulsion layer containing silver halide grains which are sensitized with a monomethine dye. The material is processed with a developer solution containing an aromatic primary amine color developing agent in the presence of at least one hydroxylamine derivative and at least one nitrogen containing heterocyclic mercapto compound.

Abstract: A silver halide photographic material is disclosed, comprising a support having thereon at least one of silver halide photographic emulsion layers and other hydrophilic colloidal layers, wherein said photographic emulsion layers or other hydrophilic colloidal layers contain a compound represented by formula (I): ##STR1## wherein at least one of A.sub.1 and A.sub.2 represents a hydrogen atom and the other represents a hydrogen atom, a sulfinic residual group, or ##STR2## wherein R.sub.0 represents an alkyl group, alkenyl group, aryl group, alkoxy group or aryloxy group, and l.sub.1 represents an integer 1 or 2; G represents ##STR3## wherein m.sub.1 represents an integer 1 or 2, sulfonyl group, sulfoxy group, ##STR4## wherein R.sub.

Abstract: A negative silver halide photographic material composed of a support having thereon at least one chemically sensitized silver halide emulsion layer at least one hydraophilic colloidal layer containing a hydrazine derivative and a compound having substantially all absorption maxima outside the visible light region represented by formula (I): ##STR1## wherein Z.sup.11 and Z.sup.12 each represents a non-metallic atomic group necessary for completing a substituted or unsubstituted heterocyclic ring selected from benzoxazole, benzothiazole, benzoselenazole, naphthoxazole, naphthothiazole, naphthoselenazole, thiazole, thiazoline, oxazole, selsnazole, selsnazoline, pyridine, benzimidazole, and quinoline; R.sup.11 and R.sup.12 each represents a substituted or unsubstituted alkyl group, provided that at least one of them is substituted with an acid radical; X represents a counter ion necessary for charge balance; and n is 0 or 1.

Abstract: A light-sensitive material comprising a light-sensitive layer provided on a support wherein the light-sensitive layer contains silver halide, a reducing agent, a polymerizable compound, and an additive compound selected from the group consisting of a 5- or 6-membered nitrogen containing heterocyclic compound, thiourea, a thiourea derivative, a thioether compound, polyethylene glycol and a polyethylene glycol derivative. Thermal image-forming methods utilizing the light-sensitive materials are also disclosed.

Abstract: A silver halide color negative photographic material having at least one blue-sensitive silver halide emulsion layer, at least one green-sensitive silver halide emulsion layer and at least one red-sensitive silver halide emulsion layer on a support, which is characterized in that the combined total of silver contents in the material is from 3.0 g/m.sup.2 to 8.0 g/m.sup.2 and the specific photographic sensitivity of the material is from 320 to less than 800. The material has improved sharpness and graininess and has high processability including pressure-resistance. Even after stored for long periods of time, the graininess of the material does not deteriorate.

Abstract: A silver halide color photographic material is described, comprising a support having provided thereon at least one silver halide emulsion layer, wherein said at least one silver halide emulsion layer comprises at least one compound represented by the formula (I) and at least one compound represented by the formula (II): ##STR1## wherein V.sub.1, V.sub.2, V.sub.3 and V.sub.4 each represents a hydrogen atom, a halogen atom, an alkyl group, an acyl group, an acyloxy group, an alkoxycarbonyl group, a carbamoyl group, a sulfamoyl group, a carboxy group, a cyano group, a hydroxy group, an amino group, an acylamino group, an alkoxy group or an aryl group, or V.sub.1 and V.sub.2, or V.sub.3 and V.sub.4 may be bound to each other to form a benzene ring;R.sub.1 and R.sub.2, which may be the same or different, each represents an alkyl group and may optionally form a salt with a metal atom or other organic compound;X.sup..crclbar.

Abstract: A silver halide photosensitive material is described which comprises at least one layer of a silver halide emulsion layer provided on a base, wherein said at least one silver halide emulsion layer comprises at least one novel dye compound represented by general formula (I): ##STR1## wherein Z.sub.1 and Z.sub.2 are independently represents a sulfur atom or a selenium atom;R.sub.1 and R.sub.2 each independently represents an alkyl group, provided that at least one of R.sub.1 or R.sub.2 must represent a butyl group, a pentyl group, a hexyl group, a heptyl group or an octyl group;V.sub.1, V.sub.2, V.sub.3, V.sub.4, V.sub.5, V.sub.6, V.sub.7 and V.sub.

Abstract: There is provided a silver halide photographic material wherein a hydrophilic colloid layer is dyed with a new water-soluble dye that will not adversely affect the photographic characteristics of the silver halide emulsion layer. The silver halide photographic material exhibits excellent performance in that the dye is photochemically inactive such that not allow the sensitivity to lower, the latent image to fade, or the image to fog, and the decoloring or dissolving of the dye proceed rapidly in a photographic processing step, leaving no detrimental color on the processed photographic material.

Abstract: A silver halide photographic emulsion comprising a silver halide emulsion, at least one ascorbic acid compound, a bisaminostilbene compound substituted by a pyrimidine derivative, and at least one sensitizing dye as described herein, exhibits an increased inhibition of desensitization due to the use of a sensitizing dye and an increase in the spectral sensitivity of the photographic emulsion.

Abstract: A negative-tupe silver halide photographic material is provided, having high sensitivity and good graininess with low fog. The material has at least one silver halide emulsion layer on a support, wherein chemically-sensitized silver halide grains contained in the emulsion of said emulsion layer comprise normal crystalline grains, and said emulsion layer containing said normal crystalline silver halide grains contains a polymer having a repeating unit represented by formula (I): ##STR1## wherein R.sub.1 represents a hydrogen atom or an alkyl group; Q represents one group selected from formulae (i), (ii), (iii), and (iv); ##STR2## wherein q is an integer of from 2 to 4; ##STR3## wherein R.sup.2 and R.sup.3 each represents a hydrogen atom or an alkyl group; ##STR4## wherein Z.sup.1 represents an atomic group forming a lactam ring, an oxazolidone ring, or a pyridone ring;A represents a single bond, ##STR5## B represents --O-- or ##STR6## wherein R.sup.

Abstract: A silver halide negative photographic material comprising a support having thereon at least one silver halide emulsion layer, at least one hydrophilic colloidal layer thereof containing (1) a hydrazine derivative, (2) a compound substantially having no absorption maximum in the visible light region represented by formula (I): ##STR1## wherein Z.sup.11, Z.sup.12, R.sup.11, R.sup.12 X and n are as defined in the specification, and (3) at least one compound represented by formula (II) or (III): ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and Q are as defined in the specification; and ##STR3## wherein R.sub.21, R.sub.22, R.sub.23, and R.sub.24, are as defined in the specification. The photographic material can be processed with a stable developer to provide an ultra-high contrast image without reduction in sensitivity, gamma or maximum density or the appearance of black pepper. The photographic material is excellent in pressure properties and anti-blocking properties.

Abstract: 5-substituted-thio-1,2,3,4-thiatriazoles and 5-substituted-oxy=1,2,3,4-thiatriazoles have been found to be supersensitive for silver halide photographic emulsions spectrally sensitized to the red and infrared regions of the electromagnetic spectrum.

Abstract: A novel silver halide photographic material is provided comprising at least one light-sensitive silver halide emulsion layer provided on a support and containing at least one hydrazine compound and at least one amine compound of the general formula (I) in said emulsion layer or at least one of other constituting layers, provided that said hydrazine compound and said amine compound can be present in the same or different layers: ##STR1## wherein R.sup.2 and R.sup.3, which can be the same or different, each represents a substituted or unsubstituted alkyl group or R.sup.2 and R.sup.3 may be linked to each other to form a ring; R.sup.4 represents a substituted or unsubstituted alkyl, aryl or heterocyclic group; A represents a divalent linkage group; X represents --CONR.sup.5 --, --OCONR.sup.5 --, --NR.sup.5 CONR.sup.5 --, --NR.sup.5 COO--, --COO--, --OCO--, --CO--, --NR.sup.5 CO--, --SO.sub.2 NR.sup.5 --, --NR.sup.5 SO.sub.2 --, --SO.sub.2 --, --S-- or --O-- group (in which R.sup.

Abstract: This invention is a silver halide photographic light-sensitive material comprising a paper support bearing thereon at least one silver halide emulsion layer containing a hydroxytetrazaindene.

Abstract: Color photographic silver halide material in which at least one layer contains a silver halide emulsion with 95 to 100 mol % of chloride which has been optimally ripened with a combination of at least one sulphur ripening body and at least one compound of the formula ##STR1## in which R.sub.1, R.sub.2 and R.sub.3 denote, independently of one another, hydrogen or alkyl, and X.sup..crclbar. denotes an anion, combines excellent sensitivity with low fog and steep gradation, particularly in the threshold and shoulder region.

Abstract: A silver halide color photographic material having at least one silver halide emulsion layer on a base, in which the emulsion layer contains at least one kind of specific magenta coupler of a pyrazoloazole system and the silver halide emulsion is a silver chlorobromide emulsion or silver chloroiodobromide emulsion chemically sensitized in the presence of a nucleic acid or a decomposition product thereof prior to the completion of chemical sensitization by sulfur compounds. This color photographic material is improved in color reproduction and image stability, less liable to fogging that is formed during development, and less dependent on processing conditions.

Abstract: Silver halide emulsions containing tabular silver halide grains are stabilized by the employment of a compound of the formula ##STR1## where R is --SO.sub.2 NH.sub.2, In a preferred embodiment an azaindene is also employed.

Abstract: A silver halide photographic material which comprises a support having provided thereon at least one photosensitive silver halide photographic emulsion layer, wherein the emulsion layer or at least one of the other hydrophilic colloid layers contains at least one of alkynyl-substituted heterocyclic quaternary ammonium salts represented by the formula: ##STR1## wherein Z represents a group of non-metallic atoms required to form a 5- to 6-membered heterocyclic ring, R.sup.1 represents an aliphatic group, R.sup.2, R.sup.3 and R.sup.4, which may be the same or different, each represents a hydrogen atom, an aliphatic group, or an aromatic group, at least one of R.sup.1, R.sup.2, R.sup.3, R.sup.4 and Z has at least one substituent having an alkynyl group, Y represents a counter ion for the charge balance, and n is a number required for charge balance.

Abstract: This invention is directed to a light sensitive silver halide emulsion comprising a cyclic ether compound having an acid function and to an element containing such emulsion and to a process for using same. The compound comprises, in the cyclic ring, at least two atoms from the group consisting of sulfur and selenium, each of which atoms being separated from one another by a chain of at least two carbon atoms. Such compound acts as a solvent and as a growth modifying agent for silver halide grains. Also described is a process for modifying the growth of silver halide grains.

Abstract: A silver halide photographic material comprising a support having thereon at least one light-sensitive silver halide photographic emulsion layer, wherein at least one layer selected from the emulsion layer and other hydrophilic colloid layers contains at least one alkynyl substituted heterocyclic quaternary ammonium salt represented by the following general formula (I): ##STR1## wherein Z represents a non-metallic atomic group necessary to form a substituted or unsubstituted 5-membered or 6-membered heterocyclic ring to which a aromatic ring or a heterocyclic ring may further be condensed; R.sup.1 represents a substituted or unsubstituted aliphatic group; X represents ##STR2## Q represents a non-metallic atomic group necessary to form a substituted or unsubstituted 4-membered to 12-membered non-aromatic hydrocarbon ring or substituted or unsubstituted non-aromatic heterocyclic ring; at least one of R.sup.

Abstract: In a process for the continuous treatment of silver halide color photographic light-sensitive materials with supplying a replenisher to a developing bath, the amount of the replenisher is 900 m or less per m.sup.2 of the light-sensitive materials, and the light-sensitive materials contain a certain type of mercapto heterocyclic compounds. Constant results in finished development and lower fog are attained and fogging during storage of raw light-sensitive materials is suppressed even when the amount of the replenisher is very small.

Abstract: A method of processing a silver halide photographic material comprising processing the silver halide photographic material in the presence of an antifoggant which is an organic compound which loses its developing restraining function by a reduction oxidation reaction with oxidized developers. The method improves the discrimination between image and non-image areas of the silver halide photographic material by the novel antifoggant which restrains fog selectively in non-image areas without decreasing photographic sensitivity and image density. The organic compound can be an anti-foggant which possesses a moiety according to the Kendall-Pelz rule and either a mercapto group or a cyclic NH group.

Abstract: A silver halide photographic material is disclosed, which comprises a support having formed thereon at least one silver halide emulsion layer, wherein the silver halide photographic material contains, in the silver halide emulsion layer, other hydrophilic colloid layer(s), or both, a compound represented by formula (I) ##STR1## wherein EAG represents an electron accepting group, --SO.sub.2 -- represents a sulfonylene group; X represents an oxygen atom (--O--), a sulfur atom (--S--) or an atomic group (--N(R.sub.2)--) containing a nitrogen atom; the single bond between --SO.sub.2 and X being cleaved after EAG receives an electron, wherein R.sub.1 and R.sub.2 each represents a simple bond or a group other than a hydrogen atom; said R.sub.1, R.sub.2, EAG may be combined with each other to form a ring; (Time) represents a group capable of releasing a photographically useful group (PUG) upon the cleavage of the SO.sub.

Abstract: A silver halide photographic material is described, which comprises a support having provided thereon at least one hydrophilic layer containing at least one alkynyl-substituted heterocyclic quaternary ammonium salt represented by the following general formula (I): ##STR1## wherein Z represents non-metallic atoms necessary for forming a 5- or 6-membered heterocyclic nucleus;R.sup.1 represents an aliphatic group, and R.sup.2 represents a hydrogen atom, an aliphatic group or an aromatic group, at least one of R.sup.1, R.sup.2 and Z having an alkynyl group, and at least one of the substituents R.sup.1 and Z including the group X-(L).sub.m - wherein X represents a group effective for accelerating adsorption onto silver halide grains and L represents a divalent linking group;Y represents a charge-balancing counter ion;n represents 0 or 1; andm represents 0 or 1.

Abstract: A silver halide photographic material comprising a support having at least one light-sensitive silver halide emulsion layer on the support, wherein at least one of the emulsion layer and other constituent layers contains at least one compound represented by formula (I) and at least one compound represented by formula (II): ##STR1## wherein R.sub.0 is an organic group having 7 to 30 carbon atoms, A is a substituted or unsubstituted phenylene group, or a substituted or unsubstituted naphthylene group, and X is NH or 0, ##STR2## wherein R.sub.1 is an aliphatic, aromatic or heterocyclic group; R.sub.

Abstract: A silver halide photographic material for use in a bright room is disclosed comprising a support having thereon at least two silver halide emulsion layers, each of the emulsion layers having a different sensitivity and comprising silver chloride grains or silver chlorobromide grains having at least about 80 mol % silver chloride, each of the silver halide emulsions layers containing from about 1.times.10.sup.-7 mol to about 1.times.10.sup.-4 mol of a rhodium salt per mol of silver, wherein the sensitivity of the lower emulsion layer (the emulsion layer coated nearer to the support) is higher than the sensitivity of the upper emulsion layer (the emulsion layer coated farther from the support) and at least one of the silver halide emulsion layers or different hydrophilic colloid layers contains a hydrazine derivative and at least one of the silver halide emulsion layers of different hydrophilic colloid layers contains a dry compound having a .sup..lambda. max of from about 400 nm to about 550 nm.

Abstract: A photographic silver halide emulsion comprising a 1,1,3,3-tetrasubstituted middle chalcogen urea compound is described wherein at least one substituent comprises a nucleophilic center. The urea compound is an effective chemical sensitizing agent. A process for chemically sensitizing silver halide is also described.

Abstract: A photographic emulsion comprising silver halide, a spectral sensitizing dye, and rhodanine.

Abstract: A silver halide color reversal photographic material is disclosed which comprises a support and at least one blue-sensitive silver halide emulsion layer, at least one green-sensitive silver halide emulsion layer and at least one red-sensitive silver halide emulsion layer on the support, which material is characterized in that at least one light-sensitive silver halide emulsion layer or at least one layer adjacent thereto contains at least one of the compounds represented by the following general formulae (I), (II), (III) and (IV): ##STR1## All the symbols used are as defined in the Specification.

Abstract: A novel silver halide photographic light-sensitive material comprising a support having coated thereon at least one silver halide emulsion layer, said silver halide photographic light-sensitive material comprising photosensitive silver halide grains and internally fogged silver halide grains, said internally fogged silver halide grains having contained therein at least one compound such as ##STR1## The silver halide photographic light-sensitive material is a high-speed one which gives an image having high contrast and high maximum density.

Abstract: A novel silver halide photographic material is provided comprising a support and at least one silver halide photographic emulsion layer formed thereon and containing in said photographic emulsion layer or at least one hydrophilic colloid layer a compound represented by formula (I): ##STR1## wherein R.sup.1 and R.sup.2 may be the same or different and each represents a hydrogen atom, an aliphatic residual group, an aromatic residual group, or a heterocyclic residual group; R.sup.3 represents a hydrogen atom or an aliphatic residual group; L.sub.1 represents a divalent aliphatic group, a divalent aromatic group, or a divalent heterocyclic group; L.sub.2 represents --O--, --CONR--, --NRCO--, --SO.sub.2 NR--, --NRSO.sub.2 --, --OCO--, --COO--, --S--, --NR--, --CO--, --SO--, --SO.sub.2 --, --OCOO--, --NRCONR'--, --NRCOO--, --OCONR--, or --NRSO.sub.

Abstract: A negative type silver halide photographic material and a method for forming a super high contrast negative image using the photographic material are disclosed. The photographic material comprises a support, at least one silver halide emulsion layer on the support, and at least one light-insensitive colloid layer on the support, said emulsion layer or light-insensitive hydrophilic colloid layer containing a hydrazine derivative, and further contains the tertiary amine salt of an acid polymer.

Abstract: A negative type silver halide photographic material and a method for processing the photographic material to form a super high contrast negative image are disclosed. The photographic material comprises a support and at least one emulsion layer on the support, said emulsion layer comprising silver halide grains comprising a core of silver halide containing silver iodide and a shell covering the core, said shell consisting essentially of silver bromide, silver chloride, or silver chlorobromide and having a thickness of from 0.01 to 0.08 .mu.m, wherein the emulsion layer or a hydrophilic colloid layer other than the emulsion layer of the photograpic material contains a hydrazine derivative.

Abstract: This invention is directed to a photographic element containing a radiation-sensitive silver halide emulsion layer and a cyclic thioether compound comprised of at least one oxygen atom and at least three sulfur atoms, each of said atoms being separated from one another by a divalent alkylene group.

Abstract: A silver halide photographic light-sensitive material comprising a support having provided thereon at least one photographic layer including at least one silver halide emulsion layer, whereinat least one silver halide emulsion layer contains silver halide grains whose average value of the diameter corresponding to the projected area of a group of silver halide grains that take 40% of the total projected area of whole silver halide grains present in said silver halide emulsion layer is at least 1.5 .mu.m andat least one photographic layer contains at least one compound capable of imagewise releasing a fogging agent or a precursor thereof or a development accelerator or a precursor thereof corresponding to a quantity of developed silver upon development, is disclosed. This material is of very high sensitivity and, furthermore, has a high developing speed and has reduced for formation irrespective of its high sensitivity.

Abstract: A silver halide photographic material comprising a support having thereon at least one light-sensitive silver halide emulsion layer containing tabular silver halide grains which have a diameter not less than 5 times the thickness thereof and account for at least 50% of the total projected area of the silver halide grains present in the silver halide emulsion layer and the silver halide photographic material also contains at least one compound represented by following general formulae (I), (II), (III) and (IV): ##STR1## wherein R represents a straight chain, branched chain or cyclic alkylene group, a straight chain or branched chain alkenylene group, a straight chain or branched chain aralkylene group or an arylene group; R.sub.

Abstract: A silver halide photographic material comprising a support having at least one silver halide emulsion layer containing substantially surface latent image type silver halide grains, said emulsion layer or at least one hydrophilic colloid layer adjacent to the emulsion layer containing a compound represented by general formula (III): ##STR1## wherein L.sub.2 represents --CONR--, --SO.sub.2 NR-- or --NRCONR' and Z, L.sub.1, m, Ro, R.sub.1 and M are as herein described. The silver halide photographic material is capable of having high contrast negative images, high sensitive negative images, and good dot images.

Abstract: A silver halide photographic material for use in the field of graphic arts and a process for forming a high-contrast negative image using the same, wherein the silver halide emulsion layer or another layer of the silver halide photographic material provided on the support contains at least one compound represented by the formula (I) and at least one blocked development restrainer compound represented by the formula (II): ##STR1##

Abstract: A negative silver halide photographic light-sensitive material is provided, having a silver halide emulsion layer, which layer comprises silver haloiodide grains prepared in the presence of an iridium salt in an amount of 1.times.10.sup.-8 to 1.times.10.sup.-5 mole per one mole of silver, wherein the silver iodide content in the surface part of said grain is larger than the average silver iodide content in said grain, and additionally containing in said emulsion layer or in some other hydrophilic colloid layer, a compound of formula (I):R.sub.1 --NHNH--CHO (I)wherein R.sub.1 represents an aliphatic group or an aromatic group. Said photographic light-sensitive material is, after being exposed imagewise, developed with a developer containing 0.15 mole/l or more sulfite ion and having a pH value of 9.5-12.3, to form negative images having ultra-high contrast.

Abstract: A novel silver halide color photographic material containing a desilvering accelerator releasing compound, which comprises at least one light-sensitive silver halide emulsion layer on a support, wherein at least one of said emulsion layer and a non-light sensitive hydrophilic layer(s) contains at least one compound represented by the formula (I)PWR--Time--.sub.t BA (I)wherein PWR represents a group which undergoes reduction to release (Time--.sub.t BA; BA represents a group which becomes a desilvering accelerator after being released; Time represents a group which releases BA through a reaction after being released from PWR as (Time--.sub.t BA; and t represents an integer of 0 or 1.