Abstract: Disclosed is a silver halide photographic light sensitive material which has a silver halide emulsion layer optically sensitized with a sensitizing dye having a maximum spectral sensitivity in the region of at least 700 nm, said emulsion layer containing at least one compound represented by the following formula (I) or at least one compound represented by the general formula (I) and at least one compound represented by the general formula (II) in combination: ##STR1## (wherein R.sub.1 and R.sub.2 each represents a hydrogen atom, an alkyl group, an aryl group, an aralkyl group, an alkenyl group, an amino group, an acylamido group or a sulfonamido group and sum of carbon atom numbers of R.sub.1 and R.sub.2 is 3 or more.); ##STR2## (wherein R.sub.3 represents an alkyl group of at least 3 carbon atoms or an aryl group).

Abstract: There is disclosed a silver halide photosensitive material for use under room-light wherein at least one silver halide emulsion layer contains (1) a spectrally unsensitized negative silver halide having an average grain size of 0.1 to 0.3 .mu.m and containing at least 80 mol % of silver chloride and (2) an organic desensitizer having an anodic polarographic potential and a cathodic polarographic potential which give a positive sum and this photosensitive material satisfying at least one of the following requirements:(a) said emulsion has undergone substantially no chemical ripening;a spectrally non-sensitizing dye capable of absorbing chiefly the rays in the range of from about 500 to 600 nm is contained in at least one of said photographic layers; and(c) at least one of the compounds from (i) to (v) as disclosed in the specification is contained in said emulsion layer.

Abstract: A silver halide photographic emulsion comprising as major constituent silver bromide with improved gradation, density and sensitivity and decreased fog is disclosed. This emulsion contains at least one of the compounds represented by the general formula ##STR1## wherein Z represents an aromatic radical, or of the oxidized derivatives thereof, and at least one of the compounds represented by the general formula ##STR2## wherein A represents a hydroxyl group, an amino group, ##STR3## R.sub.1 and R.sub.2 form a ring jointly with the carbon atom to which R.sub.1 and R.sub.2 are attached or one of R.sub.1 and R.sub.2 represents a hydrogen atom and the other represents a hydrogen atom, an alkyl group, an aryl group, or a hydroxyl group; n is 0 or an integer of 1 to 8, and M represents a hydrogen atom or an alkali metal.

Abstract: Disclosed is a silver halide photographic emulsion supersensitized with at least two sensitizing dyes selected from those represented by the following general formula [I], [II] and [III]:General formula [I]: ##STR1## wherein R.sub.1 represents an unsubstituted or substituted alkyl group, R.sub.2 represents a sulfoalkyl group or a sulfoaralkyl group, and R.sub.3 represents an alkyl group, and W.sub.1 and W.sub.2 represent each an alkylene group;General formula [II]: ##STR2## wherein W.sub.3 to W.sub.6 represent each an alkyl group, an alkoxy group, or hydroxyl group, R.sub.4 represents an unsubstituted or substituted alkyl group, R.sub.5 represents a sulfoalkyl group or a sulfoaralkyl group, and R.sub.6 represents an alkyl group;General formula [III]: ##STR3## wherein R.sub.7 represents an unsubstituted or substituted alkyl group, R.sub.8 represents a sulfoalkyl group or a sulfoaralkyl group, R.sub.9 represents an alkyl group, and W.sub.7 and W.sub.

Abstract: Disclosed is a negative fine grain silver halide photographic emulsion capable of afford hard tone and high D.sub.max and have a markedly higher sensitivity than convertional roomlight handlable light-sensitive materials and free from defects such as fogging and decrease in sensitivity under roomlight conditions. This emulsion contains at least 70 mol % of silver chloride and an organic desensitizer which has an anodic polarographic potential and a cathodic polarographic potential which when added together give a positive sum, the amount of said organic desensitizer being such that necessary to reduce the sensitivity of said emulsion by not more than log E=1.3 (log E=1.0 in the case of silver chloride). This emulsion may further contain a rhodium salt.

Abstract: There is disclosed a silver halide photosensitive material which contains in at least one of silver halide emulsion layers and colloid layers at least on antifoggant precursor compound represented by the general formula: ##STR1## wherein A, Z, R.sub.1 and R.sub.2 are the same as defined previously. This photosensitive material is stabilized against overdevelopment fogging.

Abstract: There is disclosed a silver halide photographic photosensitive material which contains in at least one of silver halide emulsion layers and colloid layers permeable to water through to or out from said emulsion layer at least one compound represented by the following general formula (I): ##STR1## wherein A, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same as defined previously. This photosensitive material has stability against over-development fogging.

Abstract: Compounds represented by the following general formula are used as hardeners for gelatin, in particular gelatin layers of photographic light sensitive materials ##STR1## (wherein R and X are the same as defined in the specification).

Abstract: A silver halide photosensitive material is stabilized against overdevelopment fogging by containing at least one antifoggant thioether represented by the following general formula I in silver halide emulsion layer and/or layer contiguous to said emulsion layer; ##STR1## wherein A represents the heterocyclic group of a mercapto antifoggant; R.sub.1 and R.sub.2, which may jointly form a benzene ring, represent each a halogen atom or an alkyl, aryl or aryloxy group.

Abstract: The compounds represented by the general formula (I) or (II) as defined in the specification are novel and useful developing agent precursors in silver halide photographic light sensitive materials.

Abstract: There is provided a gelatin-hardening compound of the formula: ##STR1## wherein R is a hydrogen atom, an alkyl group, a phenyl group, an acyl group represented by ##STR2## (where R.sub.1 is an alkyl, phenyl, alkenyl, alkoxy or amino group), a carbamoyl group, an alkoxycarbonyl group or a sulfonyl group represented by ##STR3## (where R.sub.2 is an alkyl or phenyl group), which gives an improved mechanical strength to the gelatin-containing photographic layer.