Abstract: A silver halide photographic material is disclosed, which comprises at least one silver halide emulsion layer on a support, at least one of the emulson layer and other layers contains at least one hydrazine derivative and at least one of these layers contains at least one compound having both a silver halide adsorbing group and an acid group represented by the general formula (I):C-L-D (I)wherein C represents a group that enhances adsorption to silver halide, D represents an acid group, and L represents a divalent linking group,and possessing substantially no absorption maximum in the visible region. A method for forming superhigh contrast negative images is also disclosed, comprising imagewise exposing this silver halide photographic material, followed by developing with a developing solution containing sulfite ions in an amount of about 0.15 mol or more per liter and having a pH of about 10.5 to about 12.3.

Abstract: The present invention is directed to an optical information recording medium for carrying out recording, readout and erasing with laser beams which comprises a support having carried thereon at least one of the compounds represented by the following general formulae (I), (II), (III) and (IV): ##STR1## wherein X and X' each represents an atomic group necessary for forming a carbon ring or an atomic group necessary for forming a specific heterocyclic ring; L.sup.1 mainly represents a methine group, or a group formed by linking 3 or 5 methine groups in turn to form conjugated double bonds; and Q and Q' each represents an atomic group whereby a conjugated double bond chain is completed; ##STR2## wherein L.sup.1 and Q are as defined in general formula (I); Z represents an atomic group necessary for forming a carbon ring or heterocyclic ring; R.sup.1 to R.sup.3 and E represent various substituents; and M represents an ion, etc.

Abstract: A process for the preparation of an information recording medium comprising a substrate and a recording layer for writing and/or reading information by means of a laser beam which is provided on the substrate, wherein said recording layer is formed on the substrate by coating a solution which contains a dye in a solvent containing diacetone alcohol over the substrate to form a dye-coated layer, and drying the coated layer is disclosed. Also disclosed is a process for the preparation of an information recording medium comprising a substrate, an intermediate layer and a recording layer, superposed in order.

Abstract: This invention is a process of quickly forming high contrast negative images, which are useful for photomechanical process, by development-processing a silver halide photographic material containing a hydrazine derivative in at least one of silver halide emulsion layer(s) and other hydrophilic colloid layer(s) after imagewise exposure in the existence of a compound represented by general formula (A); ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 each represents an alkyl group, a cycloalkyl group, an aryl group, an alkenyl group, a cycloalkenyl group, or a heterocyclic ring residue, these groups may have a substituent; m represents an integer; L represents an m-valent organic group bonded to the P atom through a carbon atom; n represents an integer of 1 to 3; and X represents an n-valent anion; said X may be bonded to L; using a stable processing solution.

Abstract: A negative type silver halide photographic material and a process for forming a super high contrast negative image using said material are described. This photographic material comprises a support having provided thereon at least one silver halide emulsion layer which has a substantial influence upon image density and at least one light-insensitive hydrophilic colloid layer, wherein a hydrophilic colloid layer other than said silver halide emulsion layer contains a hydrazine derivative in a non-diffusing condition. With this photographic material, a super high contrast negative image can be obtained without decreasing sensitivity and gamma by the use of a developer containing not less than 0.15 mol/liter of sulfite ions and having a pH of from 10.5 to 12.3.

Abstract: There are provided by the invention silver halide photographic light-sensitive materials containing dyestuff(s) represented by the general formula (I): ##STR1## wherein R.sup.1, R.sup.3, R.sup.4, R.sup.6, L.sub.1, L.sub.2, L.sub.3, Z.sup.1 and Z.sup.2 are groups conventional in this technical field, and R.sup.2 and R.sup.5 each represent an optionally substituted alkyl group, an optionally substituted aryl group, an optionally substituted heterocyclic group, COR.sup.7 and SO.sub.2 R.sup.7 (wherein R.sup.7 represents an optionally substituted alkyl group or an optionally substituted aryl group) (including the case where the dyestuff(s) is(are) in the form of salt(s)).The dyestuff(s) act(s) as a coloring agent for colored layer(s) for color filtering, antihalation, antiiradiation, etc.

Abstract: Disclosed are an improved method of refining steel and an apparatus for practicing the method.The refining method comprises, basically, carrying out the refining, particularly, decarburization, while stirring molten steel in the refining furnace by injecting gas thereinto, while supplying heat with a burner installed at the top of the furnace to the molten steel. According to this method, it is possible to start at an initial carbon content of the moltend steel lower than that of known AOD process, and complete the refining in a curtailed period of time and with a decreased oxidation loss of Cr. Thus, damage of refractory materials of the furnace is reduced, and the amount of Si necessary for reducing Cr-oxides in the latter stage of the refining is also reduced.Oxygen for the decarburization is supplied usually in the form of gas, but can be supplied from a solid oxygen source.

Abstract: An optical recording medium comprising a support carrying thereon a dye and at least one of the quenchers represented by the general formula (I) or (II) ##STR1## wherein (Cat.sub.1) and (Cat.sub.2) respectively represent a cation necessary for making the complex neutral, M.sub.1 and M.sub.2 respectively represent nickel, copper, cobalt, palladium or platinum, and n represents 1 or 2, is offered.The optical recording medium has a smaller deterioration during reproduction, in other words is superior in reading durability, and is at the same time superior in stability in preservation, as compared with the optical recording medium of the prior art.

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 silver halide photographic material, which contains at least one blocked photographic reagent having in the molecule thereof at least one group selected from ##STR1## group and capable of releasing a photographically useful reagent by cleavage of the --N--C--bond by a nucleophilic attack of a nucleophilic reagent on the carbonyl group and a subsequent intramolecular electron transfer reaction or intramolecular nucleophilic reaction and which has at least one photosensitive silver halide emulsion layer, is photographically processed in the presence of an amine. A photographic material which includes, in combination, a photographic reagent precursor capable of releasing a photographically useful reagent timely on photographic processing and a photosensitive silver halide emulsion layer is provided along with a method of processing the photographic material.

Abstract: An optical information recording medium having the ability to read or write information by reading or causing changes in the absorption of lasers, comprising a substrate having provided thereon a compound represented by the following general formula, and optionally a quencher: ##STR1## wherein A.sub.1 and A.sub.2 independently represent a hydrogen atom or a substituent; Z represents an atomic group necessary for forming a five-membered heterocycle; R.sub.1 to R.sub.4 independently represent hydrogen atom or a substituent; R.sub.5 represents a substituent or may form a six-membered heterocycle with Z; n represents 0.1 or 2; and X.crclbar. represents an anion.The optical information recording medium has high sensitivities in recording and regeneration, a high C/N ratio and high resistance to heat, moisture and light, and when a quencher is further contained, durability against repeated irradiation of reading light stability in preservation can be further increased.

Abstract: A negative-type silver halide photographic material comprising a support and at least one light-sensitive silver halide emulsion layer on the support, wherein compounds represented by the general formulae (I) and (II) are incorporated in the light-sensitive silver halide emulsion layer or the hydrophilic colloid layer adjacent thereto. General Formula (I):R.sub.1 --NHNH--G--R.sub.2 (I)General Formula (II):Z.sub.0 --S--Z.sub.1 (II)wherein R.sub.1 is an aliphatic or aromatic group, R.sub.2 is a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkoxy group, or a substituted or unsubstituted aryloxy group, and G is a carbonyl group, a sulfonyl group, a sulfoxy group, a phosphoryl group, or an N-substituted or unsubstituted imino group, and Z.sub.0 is an alkyl group, an aromatic group, or a heteroaromatic group, said group Z.sub.

Abstract: A reagent suitable for assaying a very small amount of hydrogen peroxide is composed of a moiety having a residue formed by removing one hydrogen from an active methylene group or an active methine group and a fluorescing moiety.Hydrogen peroxide contained in a sample liquid is determined by reacting the sample with the foregoing reagent, a hydrogen donor, and peroxidase and measuring the intensity of the fluorescence emitted from the fluorescing material formed by the reaction.

Abstract: A new optical recording medium is herein disclosed, the recording medium comprising a substrate and an optical recording layer formed thereon comprising a dye represented by the following general formula (I): ##STR1## (wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 respectively represent a hydrogen atom, a halogen atom or a monovalent organic group; A denotes a bivalent organic group which is bonded to the ring through a double bond; and X.crclbar. represents an anionic group and is present in a number required to neutralize existing cationic charges, provided that X.crclbar. may form an intramolecular salt together with either of R.sub.1 to R.sub.6 and A or that at least one of the following combinations, R.sub.2 and R.sub.3 ; R.sub.3 and R.sub.4 ; R.sub.4 and R.sub.5 ; R.sub.5 and R.sub.6 may form a substituted or unsubstituted aromatic carbocyclic ring or aromatic heterocyclic ring); and optionally a quencher.

Abstract: A silver halide photographic material which may be handled in a bright room, which comprises a support having provided thereon at least one silver halide emulsion layer containing silver chlorobromide grains (bromide content: not more than 20 mol %) or silver chloride grains, said emulsion layer containing 1.times.10.sup.-7 mol to 5.times.10.sup.-4 mol of a rhodium salt per mol of silver, and said emulsion layer or at least one other hydrophilic colloid layer containing at least one hydrazine derivative represented by the following general formula (I): ##STR1## wherein R represents an organic group having 1 to 30 carbon atoms; A represents a substituted or unsubstituted phenylene group or a substituted or unsubstituted naphthylene group; X represents --NH--or --O--; L.sub.

Abstract: A photoconductive composition containing at least one of azaazulenium salt compounds represented by the following formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 each represents a hydrogen atom, a halogen atom, a hydroxyl group, a nitro group, a carboxyl group, a sulfonic acid group, a mercapto group or a monovalent organic residue; A represents a divalent organic group bonded by the double bond; X.sup..crclbar. represents an anionic group; n is the number of X.sup..crclbar. groups required to balance the positive charge; provided that each X.sup..crclbar. group may be bonded to any of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 or A to form an inner salt; and any two of R.sub.2, R.sup.3, R.sub.4, R.sub.5 and R.sub.6 bonded to adjacent carbon atoms may be linked to form a substituted or unsubstituted aromatic carbocyclic or aromatic heterocyclic ring.

Abstract: A process for preparing an information recording medium in the form of an optical disc comprising a substrate and a recording layer. The recording layer is formed on the substrate by coating a dye solution which comprises a dye dissolved in a solvent of a fluorine-containing compound over the substrate, and drying thus coated layer.

Abstract: A novel pyrazolone dye represented by the following formula (I), which can be effectively used as a filter dye, an irradiation inhibiting dye, an antihalation dye or the like in a photographic light-sensitive material: ##STR1## wherein R.sub.1 and R.sub.2 each represents --COOR or ##STR2## R and R' each represents a hydrogen atom, an alkyl group, or an aryl group or may combine with each other to form a 5- or 6-membered ring; Q.sub.1 and Q.sub.2 each represents an aryl group; X.sub.1 and X.sub.2 each represents a linkage group; Y.sub.1 and Y.sub.2 each represents a sulfo group or a carboxyl group; L.sub.1, L.sub.2 and L.sub.3 each represents a methine group; L.sub.4 and L.sub.5 each represents an alkylene group; m.sub.1 and m.sub.2 each represents 1 or 2; n represents 0, 1 or 2; p.sub.1 and p.sub.2 each represents 0 or 1; q.sub.1 and q.sub.2 each represent 0, 1, 2, 3 or 4; and s.sub.1 and s.sub.2 each represents 1 or 2.

Abstract: A silver halide photographic material comprising a support having at least one light-sensitive silver halide emulsion layer on the support, wherein at least one of the emulsion layer and other constituent layers contains at least one compound represented by formula (I) and at least one compound represented by formula (II): ##STR1## wherein R.sub.0 is an organic group having 7 to 30 carbon atoms, A is a substituted or unsubstituted phenylene group, or a substituted or unsubstituted naphthylene group, and X is NH or 0, ##STR2## wherein R.sub.1 is an aliphatic, aromatic or heterocyclic group; R.sub.

Abstract: Novel compounds are disclosed which are 4-amino-2,3-di-substituted-1-(mono- or trichlorophenyl)-3-pyrazolin-5-ones-representing by the following formulae (1) to (3); ##STR1## and acid addition salts thereof. The compounds can be easily produced and are useful for qualitative analysis or quantitative analysis of hydrogen peroxide when used as a component of a color indicator composition for detecting hydrogen peroxide.