Abstract: High contrast negative images are obtained by developing a silver halide photographic element, in the presence of a hydrazine compound, with an alkali aqueous developing solution which contains a combination of developing agent comprising hydroquinone or substituted hydroquinone and a superadditive developing agent and an antioxidant, wherein the developing solution has a pH lower than about 12 and wherein the silver halide photographic element comprises an emulsion layer including surface latent image negative type silver halide grains in reactive association with a contrast promoting agent, preferably a diarylcarbinol compound, more preferably a diarylmethanol compound in a quantity useful to increase contrast.

Abstract: A method for the formation of a photographic image including a heating step, comprising heating a photographic material in the presence of at least one compound selected from those represented by formulae (I) and(II) ##STR1## wherein A represents a non-metallic atomic group forming a carbocyclic aromatic ring or a heterocyclic aromatic ring;X represents a nucleophilic group or a precursor thereof;Q represnts a hydrogen atom or a substituted or unsubstituted alkyl, cycloalkyl, or aryl group; andPUG represents a photographically useful group.

Abstract: An optical recording member for performing recording and reproduction of information by causing changes in the state thereof with a laser beam, which optical recording member comprises a base plate and a recording layer provided on the base plate and containing therein a phthalocyanine type compound and/or naphthalocyanine type compound represented by the following general formula: ##STR1## (where: R.sup.1 to R.sup.4 represent substituted and/or unsubstituted alkyl group, alkoxyalkyl group, aryl group, and so forth; and A denotes Pb, Sn, Cu, Ni, VO, and so on).

Abstract: A laser information recording medium comprising a substrate, a reflective layer and a recording layer. The recording layer is made of cumulative sub-layers of J-aggregates of an organic dye having an absorption band in the wavelength range of oscillation of the laser and an anionic film-forming material. The cumulative sub-layers may be formed by the Langmuir-Blodgett thin film method. The recording layer may also consist of a plurality of layers containing organic dyes having different absorption peaks of wavelength in their respective sub-layers. The organic dyes are preferably cyanine dyes of a specific type and the cationic film-forming material is preferably a mixture of at least two members of the group consisting of dioctadecyldimethylammonium chloride, octadecylamine and methyl stearate.

Abstract: A silver halide photographic material containing a cyan coupler represented by the formula: ##STR1## wherein, R.sub.1 is selected from the group consisting of an acylamino group, an alkylsulfonamido group, an arylsulfonamido group, a carbamoyl group, a sulfamoyl group, an alkylureido group, an arylureido group, an alkyl group, an alkoxy group, an amino group, an alkoxycarbonyl group and a arylcarbonyl group, said groups have at least one carboxy group as a substituent, R.sub.2 is selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a nitro group, a cyano group, a formyl group, a carboxyl group, a hydroxyl group, an amino group, an acylamino group, an alkylsulfonamido group, an arylsulfonamido group, an alkylureido group, an arylureido group, a sulfamoyl group, a carbamoyl group, an alkoxycarbonyl group and an aryloxycarbonyl group, R.sub.3 represents an alkyl group substituted with a phenoxy group; R.sub.

Abstract: Disclosed herein is an optical recording medium permitting recording and reading-out of signals without any reflective layer. The optical recording medium comprises a transparent substrate and an optical recording layer provided directly on the substrate. The recording layer contains at least 80 wt. % of a phthalo/naphthalocyanine dye represented by the following general formula (I): ##STR1## wherein L.sub.1, L.sub.2, L.sub.3 and L.sub.4 mean individually ##STR2## Q.sub.1, Q.sub.2, Q.sub.3, Q.sub.4, Q.sub.5, Q.sub.6, Q.sub.7, Q.sub.8, Q.sub.9 and Q.sub.10 denote individually a hydrogen atom or ##STR3## group; R.sub.1, R.sub.2 and R.sub.3 is individually a straight-chain or branched alkyl group having 1-12 carbon atoms, alkenyl group, phenyl group or substituted phenyl group, and two or more ##STR4## groups are contained on average in the molecule represented by the general formula (1); and M stands for a metal or a metal oxide or metal halide.

Abstract: Silver is removed from polymeric film chips such as photographic and X-ray film in a caustic treatment bath which dissolves or separates the saran and gelatin layer from the polymer, particularly polyester, layer. The silver is captured for recovery in a diatomaceous filter medium through which the treatment bath liquid is passed. Preferably liquid passed to the filter is silver-rich liquid skimmed from the top of the treatment bath. Chips and other debris are seived or screened from the liquid before filtering.

Abstract: A silver halide color photographic material is described, comprising at least one red-sensitive silver halide emulsion layer, at least one green-sensitive silver halide emulsion layer and at least one blue-sensitive silver halide emulsion layer on a support, wherein at least one coupler represented by general formula (I) is contained in at least the green-sensitive emulsion layer: ##STR1## Moieties in the couplers are defined in the specification. The wavelength of the red-sensitive emulsion layer shows a defined maximum spectral sensitivity in the short wavelength side and wavelengths corresponding to 80%, 50%, 40%, 20% and 10% of the maximum sensitivity in defined wavelength regions. Similar values are given for the long wavelength side of spectral sensitivity.

Abstract: An optical recording medium is disclosed, comprising a support having provided thereon a recording layer containing a naphtholactam dye represented by formula: ##STR1## wherein K represents a substituted or unsubstituted aromatic amine residue; R represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted allyl group; Z.sup.- represents an anion; ring A represents a substituted or unsubstituted naphthalene ring; and m represents 1 or 2. The recording layer can be formed by coating easily, has a high reflectance to provide a satisfactory contrast of recording, and exhibits excellent resistance to light.

Abstract: Siliver halide color photographic materials are disclosed which have high color-reproducibility and high color image-fastness and which are substantially free from variation with respect to sensitivity, gradation or color density as caused by variation of various factors in the development of the materials such as variation of the composition of the treating solution, the treating time or the treating temperature.The present silver halide color photographic materials have at least one silver halide emulsion layer on a support and are characterized in that silver halide grains contained in the emulsion layer comprise silver bromide or silver bromochloride, about 50% or more of the total projected area of said silver halide grains are composed of tabular grains having an average aspect ratio of about 5 or more particularly 5 to 8, and the emulsion layer further contains at least one pyrazoloazole-type magenta coupler represented by general formula (I): ##STR1## wherein R.sup.

Abstract: The stability to light of images produced from magenta couplers is improved by a combination of a hydroquinone and an indole.

Abstract: A light-sensitive silver halide photographic material having a support and at least one silver halide emulsion layer on the support. At least one layer of the silver halide emulsion layer contains a compound of the Formula I ##STR1## wherein Z represents a group of non-metallic atoms necessary to complete a nitrogen-containing heterocyclic ring which may have a substituent; X represents a hydrogen atom or a substituent capable of being split off upon reaction with an oxidation product of a color developing agent; and R represents a hydrogen atom or a substituent; and a compound represented by formula 1R.sup.1 (O).sub.n SO.sub.3 Mwherein R.sup.1 represents an alkyl group; M represents a hydrogen atom or a cation and n is 0 or 1.

Abstract: Erasable optical memories for storing information are prepared from organic materials having two stable crystalline forms. Each crystalline form has at least one different optical characteristic and the materials are reversibly thermally convertible between the crystalline forms. Information is recorded or erased with a laser beam that heats a film of the organic material in a local area to change the crystalline form. Information may also be recorded or erased by melting a local area or all of the film and quickly cooling it to restore the original crystalline form. Examples of such organic compounds are biaryl compounds, such as binaphthyls, bianthryls and biquinolyls.

Abstract: A process for hardening gelatin, which comprises incorporating in a gelatin-containing material at least one hardening compound represented by formula (I) ##STR1## wherein R.sup.1 represents a substituted or unsubstituted aryl group, Z represents non-metallic atoms necessary for the formation of a nitrogen-containing heteroaromatic ring which may optionally be substituted, X.sup..crclbar. represents an anion, and n represents 0 or 1 provided that when n represents 0, the compound forms an inner salt. The gelatin hardeners can rapidly harden gelatin with little or no post-hardening and react with reactive groups of gelatin with high selectivity.

Abstract: A propylene-ethylene block copolymer is produced by continuous bulk polymerization in which propylene alone is polymerized or propylene and ethylene are copolymerized at the ethylene/propylene reaction ratio of 6/94 using propylene as a liquid medium, and subsequently by batch-wise copolymerization in which propylene and ethylene are copolymerized at the ethylene/propylene reaction ratio from 85/15 to 5/95.

Abstract: A high flash point cycloolefin composition, including at least 50% by weight dicyclopentadiene, the composition having a flash point of greater than 100.degree. F. and a viscosity of from about 3 cps to about 3000 cps at about 70.degree. F. and about 1 atmosphere pressure. The cycloolefin composition is used in a method of preparation of cycloolefin for polymerization by metathesis catalysis to form a substantially crosslinked thermoset polymer by: distilling the cycloolefin to form distilled cycloolefin, and contacting the distilled cycloolefin and an adsorbent.

Abstract: An image deletion fluid for printing plates which use a silver image as an ink-receptive area. The deletion fluid comprises iodine and an effective excess of iodide ion, which form a triiodide complex, and a hydrophilic-matrix-forming agent. In a preferred embodiment, the deletion fluid further comprises an organic, preferably polar, solvent. The deletion fluid is applied to the surface of the plate, rubbed briefly and allowed to dry there, with no removal or rinsing away of the deletion fluid or by-products required.

Abstract: A silver halide color photographic material is disclosed, comprising a support having provided thereon at least one silver halide emulsion layer containing a cyan-dye-forming coupler represented by formula (I) ##STR1## wherein Y represents an atomic group forming an at least 7-membered nitrogen-containing heterocyclic ring containing at least one--NHCO-- group; Z represents a hydrogen atom or a group releasable upon coupling with an oxidation product of a color developing agent; R represents an aliphatic group, an aromatic group, a heterocyclic group, or a substituted amino group, or any of R, Z and Y form a dimer or higher polymer.The material forms a dye image excellent in fastness and color reproducibility, and free from white background stains.

Abstract: A negative-acting photographic element comprising a support having coated thereon one or more layers of a radiation-sensitive silver halide emulsion, at least one of the layers containing a hydrazine compound in which the one or more radiation-sensitive silver halide layers contain a first silver halide emulsion having an average grain size of from 0.1 to 0.4 microns and a second silver halide emulsion of particles with an average grain volume of less than one half that of the particles of the first emulsion.

Abstract: A silver halide photographic light-sensitive material improved in the color fastness of yellow dye images against light is disclosed. The photographic material comprises a silver halide emulsion layers containing a compound represented by General Formula [I] and a yellow coupler represented by General Formula [II]: ##STR1## wherein J is an alkylene group, R.sub.1 through R.sub.3 are each substituents and n is an integer 1 to 3, ##STR2## wherein R.sub.11 and R.sub.12 are each a hydrogen atom or substituents and R.sub.13 is a hydrogen atom or a substituent and Z.sub.1 is a group capable of being splitted of from the coupler residue upon reaction of the coupler with the oxidized product of a color developing agent.