Abstract: An arylidene-pyrazolone dye of the following formula (1): wherein R1, R2, R3, R4 and R5 each independently represent a monovalent substituent; n indicates an integer of from 0 to 4; when n is 2 or more, plural R3's may be the same or different; and R1 and R2 may bond to each other to form a cyclic structure.

Abstract: An indaniline dye represented by the following formula (1): wherein R1 and R2 represent an unsubstituted linear or branched alkyl group having from 2 to 5 carbon atoms; R3 represents an unsubstituted linear or branched alkyl group having from 1 to 3 carbon atoms; provided that the total number of the carbon atoms of R1, R2 and R3 is 6 or 7.

Abstract: An arylidene-pyrazolone dye of the following formula (1): wherein R1, R2, R3, R4 and R5 each independently represent a monovalent substituent; n indicates an integer of from 0 to 4; when n is 2 or more, plural R3's may be the same or different; and R1 and R2 may bond to each other to form a cyclic structure.

Abstract: An azo dye of the following formula: wherein R1, R2, R4 and R5 represent a hydrogen atom or a substituent; R3 and R6 each independently represent a substituent; n indicates 0 to 3. The dye has an excellent optical characteristic with sharp absorption and excellent fastness.

Abstract: A silver halide color photosensitive material comprising a support and, superimposed thereon, a blue-sensitive layer unit, a green-sensitive layer unit and a red-sensitive layer unit, each of these light-sensitive layer units composed of at least one silver halide emulsion layer, together with at least one nonphotosensitive layer, wherein the following compound (A) is contained in at least one layer of the photosensitive material, and the sensitivity thereof is enhanced by addition compound (A) as compared with that exhibited when not added, compound (A) being a heterocyclic compound having one or more hetero atoms in a ring system, wherein a sensitivity effect (X) at pH of a color developer of 10 and a sensitivity effect (Y) at pH of a color developer of 8 satisfy the following relation: Y/X<0.2.

Abstract: An ultraviolet absorbent, containing a compound represented by formula (1) or (2); and a polymer material containing the ultraviolet absorbent: wherein R11, R12 and R14 each independently represent a monovalent substituent; R13 represents a hydrogen atom or a substituent having a Hammett substituent constant ?p of ?0.35 or more; and n represents an integer of 0 to 4; and wherein R21 represents a substituted or unsubstituted alkyl group having 1 to 18 carbon atoms, or a substituted or unsubstituted phenyl group; R22 represents a substituted or unsubstituted alkyl group having 1 to 18 carbon atoms; R23 represents a hydrogen atom or a substituent having a Hammett substituent constant ?p of ?0.35 or more; R24 represents a monovalent substituent; and m represents an integer of 0 to 4.

Abstract: A heat-sensitive transfer recording ink sheet, containing a base material sheet and a dye-providing layer formed, wherein at least one kind of yellow dye contained in the dye-providing layer is an arylidenepyrazolone dye represented by formula (1): wherein X represents a substituted or unsubstituted alkoxy group having 1 to 6 carbon atoms; Y represents a halogen atom; R1 represents a substituted or unsubstituted aryl group having 6 to 10 carbon atoms; R2, R5 and R6 each represent a hydrogen atom, an unsubstituted alkyl group having 1 to 4 carbon atoms, an unsubstituted alkoxy group having 1 to 4 carbon atoms, or a halogen atom; and R3 and R4 each represent a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, or an allyl group.

Abstract: An indaniline dye represented by the following formula (1): wherein R1 and R2 represent an unsubstituted linear or branched alkyl group having from 2 to 5 carbon atoms; R3 represents an unsubstituted linear or branched alkyl group having from 1 to 3 carbon atoms; provided that the total number of the carbon atoms of R1, R2 and R3 is 6 or 7.

Abstract: A method for forming color images comprising subjecting a silver halide color photosensitive material to a development processing in the presence of a compound (A) defined below, wherein the silver halide color photosensitive material having a blue-sensitive unit, a green-sensitive unit and a red-sensitive unit, each of which comprises at least one silver halide emulsion layer, and at least one non-light-sensitive layer on a support, compound (A): a heterocyclic compound having one or two hetero atoms, the heterocyclic compound being capable of increasing speed of the silver halide color photosensitive material by the presence thereof in comparison to the case where the heterocyclic compound is absent.

Abstract: An azo dye of the following formula: wherein R1, R2, R4 and R5 represent a hydrogen atom or a substituent; R3 and R6 each independently represent a substituent; n indicates 0 to 3. The dye has an excellent optical characteristic with sharp absorption and excellent fastness.

Abstract: A silver halide color photosensitive material comprising a support and, superimposed thereon, a blue-sensitive layer unit, a green-sensitive layer unit and a red-sensitive layer unit, each of these light-sensitive layer units composed of at least one silver halide emulsion layer, together with at least one non-sensitive layer, wherein compound (A) is contained in at least one layer in the silver halide color photosensitive material, compound (A) being a compound capable of releasing compound (Ac1) by oxidation coupling reaction with a color developing agent, compound (Ac1) being a heterocyclic compound which when added, is capable of enhancing the sensitivity of the photosensitive material as compared with that exhibited when not added, provided that the heterocyclic ring of the heterocyclic compound has 1 or 2 hetero atoms.

Abstract: A silver halide color photosensitive material comprising a support and, superimposed thereon, a blue-sensitive layer unit, a green-sensitive layer unit and a red-sensitive layer unit, each of these light-sensitive layer units composed of at least one silver halide emulsion layer, together with at least one nonphotosensitive layer, wherein the following compound (A) is contained in at least one layer of the photosensitive material, and the sensitivity thereof is enhanced by addition compound (A) as compared with that exhibited when not added, compound (A) being a heterocyclic compound having one or more hetero atoms in a ring system, wherein a sensitivity effect (X) at pH of a color developer of 10 and a sensitivity effect (Y) at pH of a color developer of 8 satisfy the following relation: Y/X<0.

Abstract: A silver halide photosensitive material containing at least one of the following compound (A), compound (A) being a 6-membered heterocyclic compound having one or two hetero atoms with ClogP of 4 or less, which when added, is capable of enhancing the sensitivity of the silver halide photosensitive material by addition thereof as compared with that exhibited when not added.

Abstract: A silver halide color photosensitive material comprising at least one silver halide emulsion layer on a support, wherein an ion complex compound formed by below-mentioned compound (A) and below-mentioned compound (B) is contained in the silver halide color photosensitive material, compound (A) being a heterocyclic compound which when added, is capable of enhancing the sensitivity of the photosensitive material as compared with that exhibited when not added, compound (B) being a compound which becomes an ion having charge contrary to the charge of compound (A) at pH 6.

Abstract: A silver halide color photosensitive material comprising a support and, superimposed thereon, a blue-sensitive layer unit, a green-sensitive layer unit and a red-sensitive layer unit, each of these light-sensitive layer units composed of at least one silver halide emulsion layer, together with at least one non-sensitive layer, wherein compound (A) is contained in at least one layer in the silver halide color photosensitive material, compound (A) being a compound capable of releasing compound (Ac1) by oxidation coupling reaction with a color developing agent, compound (Ac1) being a heterocyclic compound which when added, is capable of enhancing the sensitivity of the photosensitive material as compared with that exhibited when not added, provided that the heterocyclic ring of the heterocyclic compound has 1 or 2 hetero atoms.

Abstract: A silver halide photographic light-sensitive material comprising at least one compound (A), wherein the at least one compound (A) is a compound capable of releasing a sensitizing compound that increases a sensitivity of the silver halide photographic light-sensitive material in comparison with a case where a silver halide photographic light-sensitive material does not comprise the at least one compound (A), and the sensitizing compound is released by hydrolysis.

Abstract: A method for forming color images comprising subjecting a silver halide color photosensitive material to a development processing in the presence of a compound (A) defined below, wherein the silver halide color photosensitive material having a blue-sensitive unit, a green-sensitive unit and a red-sensitive unit, each of which comprises at least one silver halide emulsion layer, and at least one non-light-sensitive layer on a support, compound (A): a heterocyclic compound having one or two hetero atoms, the heterocyclic compound being capable of increasing speed of the silver halide color photosensitive material by the presence thereof in comparison to the case where the heterocyclic compound is absent.

Abstract: A silver halide emulsion comprises an electron-releasing compound of Types 1 to 4: (Type 1) a compound capable of undergoing a one-electron oxidation (1-EO) to form a one-electron oxidation product (1-EOP), the 1-EOP capable of releasing further two or more electrons accompanying a subsequent bond cleavage reaction, (Type 2) a compound capable of undergoing 1-EO to form 1-EOP, the 1-EOP capable of releasing further one electron accompanying a subsequent bond cleavage reaction, and having, in its molecule, two or more adsorptive groups acting on silver halides, (Type 3) a compound capable of undergoing 1-EO to thereby form 1-EOP, the 1-EOP capable of releasing further one or more electrons after going through a subsequent bond forming process, and (Type 4) a compound capable of undergoing 1-EO to form 1-EOP, the 1-EOP capable of releasing further one or more electrons after going through a subsequent intramolecular ring cleavage reaction.

Abstract: A silver halide emulsion comprises an electron-releasing compound of Types 1 to 4:

Abstract: A silver halide photographic light-sensitive material, which contains at least one compound of the formula (1): Formula (1) wherein PUG represents a nitrogen-containing heterocyclic group which is bonded to the adjacent carbonyl group through a nitrogen atom, the heterocyclic group directly or indirectly has at least one nitro group as its substituent(s) and can give a pKa value of 9 to 11, ph represents a phenyl group and directly or indirectly has at least one dissociating group as its substituent(s), Z represents a substituent being capable of substitution on the benzene ring, and p is 0 to 4.