Abstract: The invention provides a compound obtained by chemically reacting a gelatin-compatible polymer having a multiplicity of functional groups with an optical brightening agent having only a single functional group reactive with the said functional groups of the polymer. The resulting compound can be mixed with gelatin to give a gelling system for the formation of gels, e.g. coating films, which are resistant to washing or leaching out of the optical brightening agent, thus overcoming the problem of the lack of substantivity of the agent in systems involving a simple mixture of gelatin with optical brightening agent.

Abstract: A photographic element is disclosed containing one or more hydrophilic coatings thereon including an organic dye or precursor thereof dispersed in a water-immiscible solvent therefor. The solvent additionally includes therein a chelated-metal compound, termed a quenching compound, having a spectrophotometric absorption peak bathochromic relative to the absorption peak of the compound to be stabilized.

Abstract: A photographic material suited for forming color radiographs, which material comprises on both sides of a film support at least one silver halide emulsion layer incorporating at least one color coupler that is capable of forming with an oxidized p-phenylenediamine type color developing agent a dye, said color coupler(s) being present in an amount sufficient to allow by exposure and color development with a p-phenylene diamine type developing agent to obtain a spectral density in the material of at least 2.0 with respect to visual filter light, the aggregate amount of silver halide in said material being equivalent to an amount of silver nitrate in the range of 5 g to 1.3 g of silver nitrate per sq.m, the silver halide grain size distribution being such that at least 50% by weight of the silver halide at both sides of the support has a mean grain size smaller than 0.55 .mu.m.

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: X-ray screens having reduced mottle and exhibiting improved image quality are prepared using europium-activated fluorohalide phosphors having an aminocoumarin brightening agent added thereto.

Abstract: A spectrally sensitized silver halide photographic emulsion containing, in combination, supersensitizing amounts of at least one sensitizing dye represented by the following general formula (I): ##STR1## wherein Z.sup.1 and Z.sup.2 each represents an atomic group necessary for completing a benzimidazole nucleus, an oxazole nucleus, a benzoxazole nucleus, a naphthoxazole nucleus, a thiazole nucleus, a benzothiazole nucleus, a naphthothiazole nucleus, a selenazole nucleus, a benzoselenazole nucleus or a naphthoselenazole nucleus excepting that both of Z.sup.1 and Z.sup.2 do not simultaneously represent an atomic group necessary for completing an oxazole nucleus, a benzoxazole nucleus or a naphthoxazole nucleus; R.sup.1 and R.sup.2 each represents an aliphatic group which may be substituted and the carbon chain of which may be interrupted with an oxygen atom or a sulfur atom; R.sup.0 represents a hydrogen atom, an alkyl group or an aralkyl group; X.sub.(1).sup.

Abstract: A high contrast, high density color image is formed on a silver halide photosensitive monochromatic, e.g., irradiated by X-rays, by subjecting the photosensitive material to coupling or color development with a developer solution containing a p-phenylene diamine developing agent and 1-phenyl-3-pyrazolidone and then, without desilverization, to fixing. The coupler may be contained in the silver halide photo-emulsion or in a developing solution.

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.

Abstract: A photographic material comprising a support coated at one side with one or more silver halide emulsion layers and at the opposite side with an electroconductive interlayer which in its turn is coated with a photoconductive layer essentially consisting of at least one organic photoconductive compound, said silver halide emulsion layer or layers being of the type that yield a latent image on exposure with actinic light and of which the latent image is developable to a silver image with a reducing agent applied as developing agent in silver halide photography, said electroconductive interlayer having a resistivity being at least 1000 times smaller than that of the photoconductive layer, and the composition of the non-developed photographic material being such, that the combined spectral density of the support, of the conductive interlayer and of the photoconductive layer does not exceed 0.3 in the wavelength range of 400 to 700 nm.

Abstract: An information display method comprising forming an image of a chemiluminescent component on a support according to information to be recorded and placing the support bearing the image of the material in an atmosphere capable of effecting the chemiluminescence of the material to thereby display the image based on a difference in luminance.