Abstract: A novel silver halide photographic light-sensitive material having at least one silver halide photographic emulsion layer coated on at least one side of a support, wherein said photographic emulsion layer comprises a light-sensitive silver halide emulsion and said photographic emulsion or other layer(s) comprises a substantially light-insensitive, unfogged silver halide fine grain emulsion, with a heterocyclic mercapto compound represented by the following general formula (I) being adsorbed on the fine grains in said emulsion: general formula (I) ##STR1## wherein X represents --O--, --NH--, or --S--; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are a hydrogen atom or a substituent group; at least one of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is a substituted or unsubstituted alkyl or aryl group having up to 13 carbon atoms, such alkyl or aryl being bonded directly or through a divalent linkage group to the aromatic nucleus; X.sub.

Abstract: A silver halide photographic material is disclosed, which comprises a support having coated thereon at least one silver halide emulsion layer, wherein the emulsion layer comprises tabular grains of silver chloride, silver bromide, silver chlorobromide or silver chloroiodobromide having an iodide content of 1 mol % or less, which have an average aspect ratio of 3 or more and which have been spectrally sensitized with at least one spectral sensitizing dyes described below.

Abstract: A silver halide photographic material is described, comprising a support bearing at least one silver halide photographic emulsion layer and at least one auxiliary layer on one side or both sides thereof, wherein the silver halide photographic emulsion layer is a layer made of a light-sensitive silver halide emulsion containing silver iodide and an internally fogged silver halide emulsion, or is composed of a layer made of the light-sensitive silver halide emulsion containing silver iodide and a layer made of the internally fogged silver halide emulsion, and the auxiliary layer contains substantially non-light-sensitive silver halide grains having an average grain size of not more than 0.5 .mu.m.

Abstract: A silver halide photographic material having a high covering power with improved pressure resistance and antistatic properties upon development, which comprises at least one silver halide photographic emulsion layer disposed on at least one side of a support, wherein at least one of the silver halide photographic emulsion layer(s) contains a photosensitive silver halide emulsion containing silver iodide and an internally fogged silver halide emulsion, and at least one of the silver halide photographic emulsion layer(s) and an auxiliary layer(s) which is disposed on the same side of the support as that of the support having said emulsion containing silver iodide contains at least one polyoxyethylenic surface active agent selected from the group consisting of compounds represented by formula (I) and (II) ##STR1## wherein R.sub.1, R.sub.2, R.sub.6, R.sub.8, R.sub.10, and R.sub.

Abstract: The present invention relates to a silver halide emulsion containing a thiocyanate and having a high sensitivity in particular to light of a low illuminance. According to the present invention, a silver halide emulsion is provided, wherein the IR absorbance at 2052 cm.sup.-1 due to thiocyanate ion contained in the silver halide grain of the emulsion is observed and a tricarboxylic acid or its salt is contained in the emulsion.

Abstract: This invention provides a silver halide photographic light sensitive material having an improved blackness of image silver, as well as high sensitivity and covering power. The present silver halide photographic light sensitive material includes at least one layer of a silver halide photographic emulsion on at least one side of a support, characterized in that said layer of silver halide photographic emulsion contains fine silver halide grains, or tabular silver halide grains having a grain thickness of 0.4.mu. or less, and a dye having a maximum absorption wave length of 520 to 580 nm is contained in said layer of silver halide photographic emulsion and/or another layer such that the transmission density of green light is 0.03 or less after the developing treatment of the photographic light sensitive material.

Abstract: A silver halide photographic light-sensitive material comprising a support having coated thereon at least one silver halide emulsion layer and a surface protecting 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 adsorbed thereon at least one compound represented by the formula (I): ##STR1## wherein X represents --O--, --NH-- or --S--, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represent hydrogen atom or a substituent, and at least one of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is substituted or unsubstituted alkyl or aryl group having up to 13 carbon atoms, which is bonded directly or through a divalent linkage group, to the aromatic nucleus.

Abstract: A silver halide photographic light-sensitive material is described, comprising at least one light-sensitive silver halide emulsion layer on a support, wherein the emulsion in said light-sensitive silver halide emulsion layer comprises a silver iodobromide emulsion containing 3 mol % or more of iodide, and at least one of said light-sensitive emulsion layer or another hydrophilic colloid layer contains a polyoxyethylene type surface active agent and at least one of said light-sensitive emulsion layer or another hydrophilic colloid layer contains a meso-ionic triazolium compound represented by formula (I) ##STR1## wherein X represents a sulfur ion or --N--R.sup.4, and R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each represents a hydrogen atom or a substituted or nonsubstituted alkyl group, aryl group, or heterocyclic group, or R.sup.1 and R.sup.2, R.sup.2 and R.sup.3 or R.sup.3 and R.sup.4 can together form a heterocyclic ring.

Abstract: A method for producing a photographic emulsion is disclosed. The method includes the process of adding a dispersion of a substantially water-insoluble photographic additive to a photographic emulsion. The dispersion being prepared merely by mechanically grinding and dispersing the photographic additive in a form of fine grain having a size of 1.mu. or less in an aqueous system adjusted to a pH value of 6 to 8 and controlled to a temperature of 60.degree. to 80.degree. C. The additive is included in the photographic emulsion without the need of an organic solvent. The emulsion of the invention can be easily and quickly coated to form a uniform layer.

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: Silver halide radiographic sensitive materials comprising at least one silver halide photographic emulsion layer on a support, which are used according to a process which comprises exposure to radiation from a fluorescent intensifying screen which emits light having a maximum emission in the green spectral range by excitation with radiation wherein at least 1/2 of the emission energy is in the wavelength range of above about 400 nm, and carrying out development of the exposed sensitive material to form radiographic images, wherein said silver halide sensitive materials contain below about 8.6 g of silver per square meter and said at least one silver halide photographic emulsion layer contains a combination of at least one dye represented by formula (I) and at least one dye represented by formula (II): ##STR1## wherein A.sub.1 and A.sub.2 each represents a hydrogen atom or a halogen atom; A.sub.3 and A.sub.4 each represents a hydrogen atom, a halogen atom, an alkoxy group or a phenyl group; B.sub.1, B.sub.

Abstract: In a process for forming radiographic images which comprises exposing a photograhic sensitive material comprising a support and at least one silver halide photographic emulsion layer to radiation from a fluorescent intensifying screen to form a latent image and thereafter developing the same, the improvement which comprises the fluorescent intensifying screen having a maximum emission wavelength in the range of about 500 to about 570 nm and a distribution such that at least about 1/2 of the emission energy is at a wavelength of above about 400 nm, and said silver halide photographic emulsion layer contains at least one sensitizing dye represented by formula (I) and at least one sensitizing dye represented by formula (II): ##STR1## WHEREIN R.sub.o represents an alkyl group and R.sub.1 and R.sub.2 each represent an alkyl group but at least one of R.sub.1 and R.sub.

Abstract: A silver halide photographic emulsion containing in a supersensitizing amount the combination of at least one sensitizing dye represented by the general formula (I) ##SPC1##wherein, A.sub.1, A.sub.2, A.sub.3 and A.sub.4 each represents a member selected from the group consisting of a hydrogen atom, a lower alkyl group, an alkoxy group, a halogen atom, a hydroxyl group, an aryl group, a carboxyl group, an alkoxycarbonyl group, a cyano group, a trifluoromethyl group, an amino group, an acylamide group, an acyloxyl group, an alkoxycarbonylamino group, and a carbalkoxy group; and A.sub.1 and A.sub.2 and A.sub.3 and A.sub.4 can combine to form a naphthoxazole nucleus; R.sub.o represents a hydrogen atom, a lower alkyl group or an aryl group; R.sub.1 and R.sub.2 each represents an alkyl group, provided that at least one of R.sub.1 or R.sub.2 represents a sulfoalkyl group; X.sub.