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: A color image-forming process is described, which comprises developing with a color developing solution containing an aromatic primary amine developing agent a silver halide color photographic material containing at least on pyrazoloazole coupler represented by formula (Ia) or (Ib) ##STR1## wherein R.sub.1, R.sub.1 ', R.sub.3, Za, and Zb are defined in the specification. The image-forming process of the invention provides a silver halide color photographic material having high maximum color density, showing high coloring speed, and forming color images excellent in fastness. Further, the process of the invention can reveal the above-described excellent properties using a color developing solution containing substantially no benzyl alcohol.

Abstract: An optical information recording medium includes an optical information recording layer supported on a substrate.

Abstract: An optical recording member comprising a recording layer containing a light abosrbing substance supported on a substrate in which recording is made by the thermal deformation of the recording layer owing to laser beams and reproduction is made by the reading the difference of the reflection between the non-deformation portion and the deformation portion, said light absorbing substance being represented by the following formula: ##STR1## wherein one of X and Y is --O(C.sub.2 H.sub.4 O).sub.n R wherein R is an alkyl group which may be branched and n is a number of from 1 to 6, and the other is a hydrogen atom, and A is VO, Cu, Ni, or Co.

Abstract: This invention relates to the use of 3,5-dihydroxybenzoic acid as an organic acidic reagent in thermographic recording materials comprising a di- or triarylmethane thiolactone dye precursor, silver behenate and a polymeric binder, and in a further embodiment, relates to coating compositions useful in the preparation of the recording materials.

Abstract: A process for hardening gelatin holograms after dehydration involving subjecting the hologram to an atmosphere containing aldehyde vapor and water vapor. The process provides hardening of the gelatin hologram to increase resistance to moisture and heat without adversely affecting diffraction efficiency. Monitoring of the diffraction efficiency during the aldehyde-water vapor treatment allows fine tuning of the hologram efficiency and evenness.

Abstract: An optical recording medium composed of a base material and a laser light sensitive layer which contains an azulenium dye as storage material with or without a binder is obtainable by spin-coating a solution containing an azulenium dye of the formula ##STR1## where R is C.sub.1 -C.sub.6 -alkyl which may be substituted or unsubstituted, and n is 1, 2 or 3, with or without a binder and one or more solvents which have evaporation numbers of not less than 4 and in which an azulenium dye of the abovementioned formula has a solubility of not less than 5 g/l onto a transparent base material based on a plastics material or glass.

Abstract: A silver halide color photographic material and a process for preparing the photographic material are disclosed, comprising a support and at least one silver halide emulsion layer on the support, wherein the emulsion layer contains a silver halide emulsion which has been spectrally sensitized by adding a spectrally sensitizing dye prior to the completion of formation of silver halide particles, and at least one cyan coupler represented by formula (I) ##STR1## wherein R.sub.11 and R.sub.12 each represents an alkyl group, an aryl group, a heterocyclic group, an alkyloxy group, an aryloxy group, a heterocyclic oxy group, an alkylamino group, an arylamino group, or a heterocyclic amino group, R.sub.13 represents a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an alkoxyl group, an aryloxy group, an acyloxy group, or an acylamino group, X is a group capble of being released upon the oxidative coupling reaction with a developing agent, or R.sub.12 and R.sup.13 together form a 5- or 6-membered ring.

Abstract: The present invention relates to an optical information recording medium for carrying out recording, reproduction and erasing with laser beams which comprises a support having carried thereon at least one methine dye which consists of an azulene nucleus, at least one of 10 carbon atoms of which is replaced by chalcogen atom(s) and/or nitrogen atom(s), and further whose 7-membered ring part is substituted with a methine bond having at the terminal an auxochrome which forms a conjugated resonance chromophore together with a 10 .pi. electron system of the nucleus.Optical information recording media of the invention have adequate recording characteristics having high C/N, and have high stabilities against long-term preservation or against long-time reading.

Abstract: A method for preparing a lithographic printing plate and a light-sensitive material for a lithographic printing plate are disclosed. The method comprises providing a light-sensitive material comprising an electroconductive support having a hydrophilic surface. Provided on the surface is a light-sensitive layer which contains an electroconductive agent as well as a photoconductive insulating layer. The material is imagewise exposed and then electrophotographically processed to form an electrostatic latent image on the photoconductive insulating layer. The exposed material is developed with developer particles which are opaque to the light which the light-sensitive layer is sensitive. The light-sensitive layer of the developed material is exposed through the image. The exposed or unexposed areas of the light-sensitive layer are then removed together with the photoconductive insulating layer. The lithographic printing plate produced has excellent resolving power and does not cause printing stains.

Abstract: In a method of preparing a light-sensitive silver halide photographic emulsion, silver salt and halide are mixed in the presence of an iridium compound. The emulsion is then chemically ripened by an instable sulfur compound and a nitrogen-containing heterocyclic compound capable of forming a complex with silver.

Abstract: A method of hardening gelatin comprising adding to the gelatin to be hardened at least one compound represented by formula (I) ##STR1## wherein L represents a divalent organic group, R represents a hydrogen atom or a univalent organic group, A represents a substituted or unsubstituted benzene ring which may be condensed with another ring, M.sup..sym. represents a hydrogen ion, an alkali metal ion or an ammonium ion, and n has a value of 1 or 2 or 3. The method may be applied to various processes involving hardening of gelatin, such as processes for forming various photographic materials or microcapsules.

Abstract: Water soluble sulphates of a heteroaromatic bis- or poly-sulphone are suitable for use as hardeners for proteinaceous binders, in particular in photographic layers.

Abstract: The present invention relates to a photographic support comprising, on a substrate, a filling layer comprising a fine solid powder having the stationary diffuse-reflective surface and a color photosensitive material comprising at least one silver halide emulsion layer formed on the secondary diffuse-reflective surface of a filling layer comprising a solid powder formed on a substrate. A photographic support of the present invention provides an image having remarkably improved brightness, saturation, tone reproducibility in shade areas and sharpness. A printing color photosensitive material of the present invention provides an image having remarkably improved brightness, saturation, tone reproducibility in shades and sharpness and also capable of rigid development.

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: 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 plate and a pattern transfer method comprising forming an original picture pattern on a first photographic plate having a silver halide emulsion layer on a glass support and contact transferring the original picture pattern onto a second photographic plate having a silver halide emulsion layer on a glass support or a substrate having a photoresist layer,characterized in that the first and second photographic plates comprise a silver halide emulsion contained in the emulsion layer which is a silver iodobromide emulsion containing 8 mol % or less of silver iodide and with its mean grain size being 0.1 .mu.m or less; or contain a silver halide emulsion in the emulsion layer which contains 50 mol % or more of silver chloride; andthat at least one of the first and second photographic plates has an emulsion layer with surface roughness of 0.3 .mu.m to 3 .mu.m, anda silver halide photographic plate to be used for the method.

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 method for preparing a silver halide photographic emulsion is disclosed, comprising silver halide grains having silver halide protrusions on the surface of the silver halide grain matrix, wherein the silver halide grain matrix is chemically sensitized and then the silver halide protrusions are formed on the surface of the thus chemically sensitized silver halide grain matrix.

Abstract: A photochromic material comprising a thin film of montmorillonite intercalation compound which has as a guest organic metal complex ions exhibiting a property of accepting electrons in a photo-excited state,a photochromic device comprising; (i) a transparent electrode layer 1, (ii) a transparent layer 2 of polycrystalline n-type semiconductor, (iii) the above-mentioned thin film 3 of montmorillonite intercalation compound, (iv) an electrolytic layer 6 containing an electron-donative reducing agent and (v) an opposed transparent electrode layer 4, anda method for recording and erasing information, comprising the steps of forming the above-mentioned thin film 3 of montmorillonite intercalation compound over the transparent layer 2 of polycrystalline n-type semiconductor, irradiating with light the thin film 3 in contact with the electrolyte 6 containing an electron-donative reducing agent to develop color on the irradiated site of the film and applying a bias voltage to the film being exposed to light to remove