Abstract: A silver halide photographic light-sensitive material is disclosed. The material is comprised of a support having positioned thereon a silver halide emulsion layer and a compound represented by the general formula (I): ##STR1## wherein R is a halogen atom or an alkyl group and n is 1, 2 or 3 and when n is 2 or 3 each R may be the same or different. Utilization of the compound represented by the general formula (I) aids in the elimination of the generation of fog without creating undesirable influences on the photographic properties of the material.

Abstract: A silver halide emulsion is disclosed which contains silver halide grains formed in the presence of a silver halide solvent. The solvent is a benzimidazole derivative having a hydrogen atom connected to the nitrogen atom at the 1st position thereof. By using this particular solvent a regular silver halide photographic emulsion having high sensitivity causing less fog is obtained. The silver halide solvent is unexpectedly advantageous in that can be almost completely desorbed from the silver halide grains by washing.

Abstract: A silver halide photographic emulsion is described, which has halogen composition comprises at least 60 mole % of silver chloride, 40 mole % or less of silver bromide, and 5 mole % or less of silver bromide. Grain formation is performed in the presence of a silver halide solvent selected from the group consisting of tetrasubstituted thioureas and organic thioethers, and from 10.sup.-8 to 10.sup.-5 mole of a water-soluble iridium compound per mole of silver halide. This photographic emulsion exhibits high sensitivity and provides high contrast even by flash exposure. Thus, it is useful for the production of light-sensitive materials to be used in the production of printing plates in accordance with photographic engraving.

Abstract: A silver halide photographic light-sensitive material and a developing process used in connection with that material are disclosed. The material is comprised of a support having thereon a silver halide emulsion layer containing a silver halide emulsion in which at least 80 mole % of the whole silver halide is composed of silver chloride, the mean grain size thereof is less than 0.4 .mu.m, and which contains more than 1.times.10.sup.-6 mole of a water-soluble rhodium salt per mole of silver at an optional period before finishing the first ripening in the production step for the silver halide emulsion. The material also contains 1.times.10.sup.-5 to 1.times.10.sup.-2 mole of polyalkylene oxide having a molecular weight of at least 600 or a derivative thereof per mole of silver. The process involves imagewise exposing the material and processing it in a developer containing 0.05 to 0.5 mole/liter of a dihydroxybenzene series developing agent, 0 to 0.05 g/liter of an auxiliary developing agent, at least 0.

Abstract: A silver halide photographic light-sensitive material is described comprising a support having thereon at least one silver halide emulsion layer wherein the silver halide emulsion has been chemically ripened in the presence of at least one compound containing at unit represented by the formula ##STR1## wherein M represents hydrogen, an alkali metal atom, or NH.sub.4. The silver halide photographic light-sensitive material shows high sensitivity without an accompanying increase in fog.

Abstract: A process for the development of color photographic light-sensitive material is described. The process comprises color developing an exposed light-sensitive material in the presence of a compound of the general formula: ##STR1## wherein M is a hydrogen atom, an alkali metal atom, NH.sub.4 or a protective group for the mercapto group which undergoes cleavage by the action of an alkali; R is a hydrogen atom or an alkyl group containing 1 to 3 carbon atoms; and R' is a hydrogen atom or an alkyl group containing 1 to 3 carbon atoms. This process prevents the formation of color development fog without seriously reducing sensitivity.

Abstract: A method of forming negative dot images which comprises imagewise exposing through a contact screen a silver halide photographilic light-sensitive material of substantially the surface latent image type containing in a silver halide emulsion layer or another hydrophilic colloidal layer(a) a hydroquinone developing agent, and(b) a compound represented by the formula, R.sup.1 NHNHCOR.sub.2, wherein R.sup.1 is an aryl group which may be substituted, and R.sup.2 is a hydrogen atom, an alkyl group which may be substituted, or an aryl group which may be substituted, and thereafter processing the thus exposed light-sensitive material with an activator aqueous solution having a pH of 11.5 or more.

Abstract: A photographic light-sensitive material which has on a support at least one silver halide emulsion layer containing large-size silver halide grains formed in the presence of at least one compound acting as a silver halide solvent and having the following general formual (I): ##STR1## wherein l and m each represents an integer of 2 or 3; n represents zero or an integer of 1 or 2; and R.sup.1 and R.sup.5 may be the same as or different from one another, each being an alkyl group, a hydroxyalkyl group or carboxyalkyl group, and when n equals zero, at least one of the substituents of R.sup.1 to R.sup.4, must be a hydroxyalkyl group, while when n does not equal zero, at least two of the substitutents of R.sup.1 to R.sup.5, must be hydroxyalkyl groups. Use of the compound of the present invention results in emulsions exhibiting excellent reproducibility with respect to gain sizes of silver halides.

Abstract: A method for forming a high contrast negative photographic image, which comprises imagewise exposing a photographic material comprising a support having thereon at least one photographic silver halide emulsion layer with the photographic silver halide emulsion layer or at least one hydrophilic colloid layer of the photographic material containing a compound of the general formula (I)R.sup.1 --NHNHCO--R.sup.2 (I)wherein R.sup.1 represents an aryl group, and R.sup.2 represents a hydrogen atom, a phenyl group, or an unsubstituted alkyl group containing 1 to 3 carbon atoms, and then developing the imagewise exposed material in the presence of a hydroquinone compound of the general formula (II) ##STR1## wherein R.sup.3, R.sup.4, R.sup.5 and R.sup.6, which may be the same or different, each represents a hydrogen atom, a sulfo group, an alkyl group, an aryl group, an aralkyl group, a heterocyclic group, or a group of the formula --O--R.sup.7 or --S--R.sup.7 where R.sup.

Abstract: A silver halide photographic material is described, comprising an emulsion which is chemical-ripened in the presence of a compound having the formula (I) or (II), ##STR1## wherein R.sub.1 is hydrogen, an alkali metal ion, or an ammonium ion; R.sub.2 is an alkyl group, an alkoxy group, an aryloxy group, an acyl group, an amino group, a substituted amino group, a halogen atom, an acyloxy group, an acylamino group, a carbamoyl group, a nitro group, an aryl group, an allyl group, a sulfo group or a carboxy group; Y represents a divalent linking group; and n is 0, 1, or 2; such emulsions show high sensitivity without fog and have good stability.

Abstract: A silver halide photographic light-sensitive element is described containing a cephalosporin compound in its silver halide emulsion layer of substantially the surface latent image type, or in its hydrophilic colloid layer. This light-sensitive element is prevented in the latent image fading.

Abstract: A silver halide photographic light-sensitive element is described comprising a support having thereon at least one silver halide emulsion layer, wherein at least one compound represented by formula (I) is incorporated in the silver halide emulsion layer or in another hydrophilic colloid layer: ##STR1## wherein X represents a hydroxy group or a group represented by ##STR2## wherein R.sup.2 and R.sup.3 (which may be the same or different) each reprsents hydrogen, an alkyl group, or an aryl group; R.sup.1 represents a sulfur-containing saturated heterocyclic group or a group represented by -A-S-B, wherein A represents an alkylene group and B represents hydrogen, an alkyl group, or an aryl group; and Z represents an atomic group forming a 5-membered or 6-membered unsubstituted or substituted carbocyclic ring.In the silver halide photographic light-sensitive element, the so-called "latent image fading" phenomenon is prevented without accompanying degradation of other photograhic properties.

Abstract: A photographic image-forming method comprising imagewise exposing a silver halide photographic light-sensitive element containing a specific hydroquinone derivative in the silver halide emulsion layer of substantially the surface latent image type or at least one hydrophilic colloid layer thereof and then developing the exposed light-sensitive element in the presence of a specific hydrazine compound. The method forms a photographic image having markedly high negative gradation.

Abstract: A lithographic silver halide photographic light-sensitive material is described which scarcely exhibits colored fringe and black pepper, forms halftone dots of good quality whether a fresh or an exhausted developer is used for processing thereof, and which scarcely shows a drop in sensitivity even when a developer contaminated by a fixing solution is used; said material comprises a support and at least one lithographic silver halide emulsion layer, and containing in said emulsion layer or in another hydrophilic colliodal layer which does not contain silver halide emulsion at least one compound represented by formula (I) ##STR1## wherein M represents hydrogen, an alkali metal ion or --NH.sub.4.sup..sym. ; X represents --SO.sub.2 NHR', --COOM', --SO.sub.3 M', --OH or --CONH.sub.2, wherein M' represents hydrogen, an alkali metal ion or --NH.sub.4.sup..sym.

Abstract: A silver halide photographic light-sensitive material is described, comprising at least one silver halide photographic emulsion layer, wherein at least one layer contains a compound represented by formula (I) ##STR1## wherein R.sup.1 and R.sup.2 each represents hydrogen, an aliphatic group, an aromatic group, or a heterocyclic group;R.sup.3 represents hydrogen or an aliphatic group, andX represents a divalent aromatic group.The light-sensitive material provides high-contrast negative images and good dot image quality.

Abstract: A silver halide photographic material providing very high contrast and negative image photographic characteristics comprising a support having thereon at least one silver halide photographic emulsion layer containing substantially surface latent image type mono-dispersed silver halide grains and providing a negative image, at least one hydrophilic colloid layer of the photographic material containing a compound represented by the general formula (I)R.sup.1 NHNHCOR.sup.2 (I)whereinR.sup.1 represents an aryl group and R.sup.2 represents a hydrogen atom, a phenyl group, or an unsubstituted alkyl group having 1 to 3 carbon atoms;and a compound represented by the general formula (II) or (III) ##STR1## wherein R.sup.3, R.sup.4, R.sup.5 and R.sup.

Abstract: A process is described for developing a black-and-white silver halide photosensitive material comprising treating the material with a developing solution containing a sludge preventing compound represented by the formula (I) ##STR1## wherein X represents hydrogen, a hydroxyl group, a lower alkyl group, a lower alkoxy group, a halogen atom, a carboxyl group or a sulfo group, and M.sup.1 and M.sup.2, which may be the same or different, each represents hydrogen, an alkali metal atom, or an ammonium group.

Abstract: A silver halide photographic emulsion containing the compound represented by the formula (I):R.sub.1 --(X--R.sub.3).sub.m --X--R.sub.2 (I)wherein R.sub.1 and R.sub.2 each represents an alkyl group containing 1 to 5 carbon atoms substituted with two or more substituents selected from --OH, --NHR.sub.4, --COOR.sub.4, --CONH.sub.2, --SO.sub.3 H, --COOM, or --SO.sub.3 M, R.sub.3 represents an alkylene group containing 1 to 4 carbon atoms which may be substituted by --OH, R.sub.4 represents a hydrogen atom or an alkyl group containing 1 to 5 carbon atoms, X represents a sulfur or oxygen atom, provided at least one X is a sulfur atom, m represents 0 or an integer of 1 to 4, and M represents an alkali metal atom.

Abstract: A method of forming an extremely high-contrast negative photographic image which comprises image-wise exposing a photographic light-sensitive material comprising a support having thereon a mono-disperse silver halide emulsion layer containing surface latent image type silver halide grains and also containing a compound represented by the following general formula (1):R.sup.1 NHNHCOR.sup.2 (I)wherein R.sup.1 represents an aryl group, R.sup.2 represents a hydrogen atom, a phenyl group or an unsubstituted alkyl group having 1 to 3 carbon atoms, and then processing the exposed light-sensitive material in the presence of a compound having a thioamido moiety in the molecule thereof.

Abstract: A silver halide photographic light-sensitive material having at least one silver halide photographic emulsion layer comprising substantially surface latent image type silver halide grains, and containing in said photographic emulsion layer or at least one of other hydrophilic colloid layers a compound represented by the following general formula (I): ##STR1## wherein R.sup.1 represents a hydrogen atom, an aliphatic group which may be substituted or an aromatic group which may be substituted; Ar represents a divalent aromatic group which may be substituted; Y represents a divalent linking group; n represents 0 or 1; R.sup.2 represents a hydrogen atom, an aliphatic group which may be substituted or an aromatic group which may be substituted; and Z represents a nonmetallic atomic group necessary to form a 5-membered or 6-membered heterocyclic ring together with the ##STR2## linkage.