Abstract: Disclosed is an optical information recording medium comprising a substrate having provided thereon a recording layer capable of recording information by laser beam irradiation, wherein the recording layer contains at least one compound represented by the following general formula (I): The symbols in the formula (I) are defined in the specification. Also disclosed is a method for recording optical information using the optical information recording medium.

Abstract: A lithographic printing plate precursor having an image-forming layer capable of drawing images by heat or heat mode exposure, which comprises a support and a layer containing a heat decomposable dye having an absorption maximum wavelength in a visible region, not substantially having an absorption in an oscillation wavelength of a laser used for heat mode exposure, and having a heat decomposition initiation temperature of 250° C. or lower.

Abstract: An information recording medium showing a high light-resistance has a recording layer containing a dye compound having the following formula (I-1) or (I-2): in which each of A1, A2, B1 and B2 is a substituent; each of Y1 and Z1 is a group of atoms required for forming a carbon ring or a heterocyclic ring; each of E and G is a group of atoms required for forming a conjugated double bond chain; X1 is ?O, ?NR or ?C(CN)2, wherein R is a substituent; X2 is —O, —NR or —C(CN)2, wherein R is a substituent; each of L1, L2, L3, L4 and L5 is a methine group which may have a substituent; Mk+ is an onium ion containing a positively charged onium atom to which no hydrogen atom is attached; each of m and n is 0, 1 or 2; each of x and y is 0 or 1; and x is an integer of 1 to 10.

Abstract: A cyanine dye compound represented by formula (I) shown below, and an optical recording medium having a recording layer which is capable of recording information by laser irradiation and contains the cyanine dye compound. In formula (I), Xp− represents a p-valent anionic tetracyanoquinodimethane compound represented by formula (II): The other symbols in the formulas are defined in the specification.

Abstract: An information recording medium showing a high light-resistance has a recording layer containing a dye compound having the following formula (I-1) or (I-2): 1

Abstract: An information-recording medium comprising a substrate having thereon a recording layer capable of recording information with laser light, said recording layer containing: at least one compound selected from the group consisting of compounds represented by the following general formulae (I-1), (I-2), (I-3) and (I-4); and an organic dye other than said compounds. The symbols in the above formulae are defined in the specification.

Abstract: An information recording medium showing a high light-resistance has a recording layer containing a dye compound having the following formula (IV-2): in which each of Y2 and Z2 is a group of atoms required for forming a carbon ring or a heterocyclic ring; each of L6, L7, L8, L9 and L10 is a methine group which may have one or two substituents; M2+ is an onium ion; and each of m1 and n1 is 0, 1 or 2.

Abstract: A lithographic printing plate precursor having an image-forming layer capable of drawing images by heat or heat mode exposure, which comprises a support and a layer containing a heat decomposable dye having an absorption maximum wavelength in a visible region, not substantially having an absorption in an oscillation wavelength of a laser used for heat mode exposure, and having a heat decomposition initiation temperature of 250 ° C. or lower.

Abstract: Disclosed is an optical information recording medium comprising a substrate having provided thereon a recording layer capable of recording information by laser beam irradiation, wherein the recording layer contains at least one compound represented by the following general formula (I): 1

Abstract: An information recording medium showing a high light-resistance has a recording layer containing a dye compound having the following formula (I-1) or (I-2): 1

Abstract: An information-recording medium comprising a substrate having thereon a recording layer capable of recording information with laser light, said recording layer containing: at least one compound selected from the group consisting of compounds represented by the following general formulae (I-1), (I-2), (I-3) and (I-4); and an organic dye other than said compounds.

Abstract: An information recording medium composed of 1) a transparent support, 2) a recording layer which is composed of an organic dye having an oxidation potential in terms of Po and an organic oxidizing agent having a reduction potential in terms of Pr in which the oxidation potential and the reduction potential satisfy the condition of 0.4V<Po−Pr<1.0V, and 3) a light-reflecting layer on the recording layer shows improved light-resistance and endurance as well as good recording and reproducing characteristics.

Abstract: A processing composition for silver halide photographic light-sensitive material, which comprises at least one compound represented by the following formula (A), (A-I) or (A-II) and at least one compound represented by the following formula (B): ##STR1## Also disclosed are a developer prepared from the processing composition, and a processing method using the developer.

Abstract: A method for forming an image which comprises imagewise-exposing a silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer, wherein the emulsion layer or other hydrophilic colloid layer contains a hydrazine derivative as a nucleating agent and contains at least one compound represented by formula (A); and then developing the exposed photographic material with a developer having a pH of 9.0 to 11.0 which contains an ascorbic acid type developing agent and does not substantially contain a dihydroxybenzene type developing agent: ##STR1## wherein X represents a hydrogen atom, an aryl group, a heterocyclic group, or a group represented by formula (B): ##STR2## wherein each of R.sub.1, R.sub.2 and R.sub.3 may be the same or different, and each represents a hydrogen atom or a group other than a hydroxyl group.

Abstract: An information recording medium composed of 1) a transparent support, 2) a recording layer which is composed of an organic dye and an organic oxidizing agent having a reduction potential on the side nobler than -0.2, and 3) a light-reflecting layer on the recording layer shows improved light-resistance and endurance as well as good recording and reproducing characteristics.

Abstract: A development processing method of a silver halide black-and-white photographic material is described, which comprises the steps of (a) exposing a silver halide photographic material comprising a support having thereon at least one light-sensitive silver halide emulsion layer, and (b) developing the exposed silver halide photographic material with a developer, wherein at least one layer of the light-sensitive silver halide emulsion layer and a hydrophilic colloid layer contains at least one hydrazine derivative represented by the following formula (I); the developer contains substantially no dihydroxybenzene compound; and the developer contains (1) a developing agent selected from ascorbic acid, erythorbic acid and derivatives thereof, (2) a developing agent represented by the following formula (II), and (3) an auxiliary developing agent exhibiting a superadditive property. ##STR1## The formulae (I) and (II) are described in the specification in detail.

Abstract: Disclosed is a method for developing a silver halide photographic material, which comprises processing the silver halide photographic material having at least one silver halide emulsion layer containing silver halide grains, with a substantially hydroquinone-free developing solution containing (i) a compound represented by formula (A) as a developing agent, wherein at least 50% of the sum of the projected area of the silver halide grains are tabular silver halide grains having an aspect ratio of 3.0 or more, and said developing solution contains (ii) a compound represented by formula (B): ##STR1## wherein R.sub.1 represents a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group; and ##STR2## wherein X represents an oxygen atom or a sulfur atom, Y represents a hydrogen atom or a substituent group, and M represents a hydrogen atom, an alkali metal ion, a quaternary ammonium ion or a quaternary phosphonium ion.

Abstract: A method of processing a silver halide photographic material with a developer containing a compound represented by formula (A), wherein the developer further contains at least one compound represented by formula (B) or (C): ##STR1##

Abstract: A silver halide photographic material is processed with a developing solution containing at least one kind of developing agent represented by the following general formula (A): ##STR1## wherein R.sub.1 and R.sub.2 may be the same or different, and each represents a hydrogen atom or a substituent group, with the proviso that R.sub.1 and R.sub.2 are not methyl groups at the same time nor a combination of a hydrogen atom and a methyl group, thereby providing a novel method for forming an image by use of the developing solution not using a dihydroxybenzene compound as the developing agent, and more particularly a superhigh contrast negative image by use of the photographic material containing a hydrazine compound.