Abstract: A silver halide photographic light-sensitive element having at least one hydrophilic colloid layer containing at least one basic polymer and at least one merocyanine dye represented by the following general formula (I): ##STR1## wherein X represents an alkyl group, an aralkyl group, an aryl group, an alkoxy group, a hydroxy group, an amino group, a carboxy group or an alkoxycarbonyl group; Y represents a hydrogen atom, a halogen atom, a lower alkyl group, a hydroxy group or a sulfo group; R.sub.1 represents an alkyl group; R.sub.2 and R.sub.3, which may be the same or different, each represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group or an alkoxycarbonyl group; L.sub.1, L.sub.2, L.sub.3 and L.sub.4 each represents a methine group; m represents 0 or 1; and M represents a cation.

Abstract: Methine dyes represented by the following general formulae (A), (B) or (C): ##STR1## wherein R.sub.1 represents an alkyl group (which may be substituted), an aralkyl group (which may be substituted), an aryl group (which may be substituted), a 5- or 6-membered heterocyclic residue, a carboxyl group, an alkoxycarbonyl group, an aryloxycarbonyl group or an amino group (which may be substituted); R.sub.2, R.sub.3, R.sub.4 and R.sub.5, which may be the same or different, each represents an alkyl group (which may be substituted), an aralkyl group (which may be substituted), an aryl group (which may be substituted) or a 5- or 6-membered heterocyclic residue, with R.sub.2 additionally representing a hydrogen atom; Z represents an atomic group necessary to form a heterocyclic nucleus containing a 5- or 6-membered hetero ring; Y.sub.1 and Y.sub.

Abstract: A silver halide photographic light-sensitive element which comprises at least one silver halide emulsion layer and at least one hydrophilic colloid layer containing at least one dye represented by the following formula (I): ##STR1## wherein R represents a hydrogen atom, an aliphatic hydrocarbon group, an aromatic hydrocarbon group or an aralkyl group; X represents a hydrogen atom, a halogen atom, an aliphatic hydrocarbon group, an alkoxy group, an alkylthio group or a substituted amino group; L represents a methine group; M represents a cation; and p represents an integer of 1 to 3. The dyes are useful in antihalation and filter layers, and can be decolorized readily and completely.

Abstract: A silver halide photographic light-sensitive element containing at least one dye represented by general formula (I) set forth below in at least one hydrophilic colloid layer of the silver halide photographic light-sensitive element: ##STR1## wherein X represents an amino group, a hydroxy group or an alkoxy group; m represents 0 or 1; Q represents an aryl group substituted with at least one of a sulfo group, a sulfoalkyl group or a carboxy group; R.sup.1 represents an aliphatic group; R.sup.2 and R.sup.3, which may be the same or different, each represents a hydrogen atom, an alkyl group, an alkoxycarbonyl group, an acyl group or a carboxy group; L.sup.1, L.sup.2, L.sup.3 and L.sub.4 each represents a methine group, an alkyl substituted methine group or a phenyl substituted methine group; and n represents 0 or 1.

Abstract: A silver halide photographic light-sensitive element containing at least one hydrophilic colloid layer which contains a basic polymer and at least one oxonol dye which contains two pyrazolone nuclei in which the 3-position of the pyrazolone nuclei is substituted with a phenyl group-containing residue and in which the 1-position of the pyrazolone nuclei is substituted with a sulfo group containing aliphatic group.

Abstract: Silver halide photographic sensitive elements having at least one dye containing hydrophilic colloid layer, in which the hydrophilic colloid layer contains at least one merocyanine dye having an isoxazole nucleus, a pyrazoline-5-one nucleus and at least one acid group in the molecule wherein the 3-position of the isoxazole nucleus is linked through a methine chain to the 4-position of the pyrazoline-5-one nucleus and a basic polymer is included in at least one of the hydrophilic colloid layers.

Abstract: A styryl and butadienyl dye suitable as a filter dye or antihalation dye for photography having the formula ##STR1## wherein R represents a lower alkyl group, an unsubstituted or substituted sulfo lower alkyl group, an unsubstituted or substituted sulfo lower alkenyl group, or a carboxy lower alkyl group; A represents an atom necessary for forming a 5-membered or 6-membered heterocyclic ring; Z represents a hydrogen atom, a methyl group, or a phenyl group; B represents a hydrogen atom, a lower alkyl group, a hydroxyl group, an alkoxy group, a halogen atom, a nitro group, a carboxyl group, an unsubstituted or substituted acylamino group, an alkoxycarbonylamino group, an alkylsulfonylamino group, or an alkylthio group; R.sub.1 represents --OR.sub.2 or ##STR2## R.sub.2 represents an unsubstituted or substituted sulfo lower alkyl group; R.sub.3 and R.sub.

Abstract: A silver halide photographic light-sensitive material having at least one hydrophilic layer to be dyed and containing, in a hydrophilic layer to be dyed, a dye represented by the following general formula (I): ##EQU1## wherein R represents an alkyl group or an alkenyl group; A represents an imino group (--NH--); Y represents an oxygen atom or a sulfur atom; Q represents an aryl group substituted with at least one of a sulfo group, a sulfoalkyl group and a carboxy group; L represents a methine group; n represents an integer of 0 to 1, and m and p each represents an integer of 0, 1 or 2; a silver halide photographic light-sensitive material containing at least one spectrally sensitized silver halide emulsion layer and in at least one hydrophilic layer to be dyed of the photographic light-sensitive material, at least one dye represented by general formula (I) as set forth above; and a silver halide photographic light-sensitive material containing at least three silver halide emulsion layers having different spec

Abstract: A photographic light-sensitive material comprising at least one hydrophilic colloid layer containing at least one dye represented by the following formula (I): ##SPC1##wherein R.sup.1 represents an alkyl group, a carboxy group, an alkoxycarbonyl group, a carbamoyl group, an alkylcarbamoyl group, a sulfamoyl group, an alkylsulfamoyl group, an acyl group, a hydroxy group, an alkoxy group, an alkylthio group, an amino group, a ureido group, an alkylureido group, a thioureido group or an alkylthioureido group; Q represents a sulfoalkyl group, a sulfoalkoxyalkyl group or a sulfoalkylthioalkyl group; L represents a methine group; n is 0 or 1; R.sup.2 represents --OR.sup.5 or ##EQU1## wherein R.sup.5, R.sup.6 and R.sup.7 each represents a hydrogen atom or an alkyl group; R.sup.3 represents a hydroxy group, an alkoxy group or an alkyl group; and R.sup.4 represents a hydrogen atom, an alkyl group, an alkoxy group, a sulfoalkoxy group, an alkylamino group or a dialkylamino group.

Abstract: A silver halide photographic light-sensitive member comprising a support having on one side of the support at least one silver halide photographic emulsion layer and on the other side of the support at least one layer containing at least one dye represented by the general formula (I): ##SPC1##wherein Z is a group of atoms required for forming an indolenine nucleus or benzindolenine nucleus; R.sup.1 is a lower alkyl group or a lower alkenyl group; R.sup.2 is an --OXSO.sub.3 .sup.- group or an ##EQU1## group wherein X is an alkylene group or an alkenylene group, and Y is a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, an acyl group, or an --OXSO.sub.3 .sup.- group; R.sup.3 is a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, a hydroxy group, an alkoxy group, an alkylthio group, a carboxy group, an alkoxycarbonyl group, an alkoxycarbonylamino group, or an acylamino group; and p is an integer of 1 or 2.

Abstract: Crude hydroquinone containing impurities is purified in a sublimation purification apparatus where the crude hydroquinone is introduced into a stirred and fluidized bed, a carrier gas which is inert to the hydroquinone is passed therethrough, and the temperature therein is kept at about 110.degree.-170.degree.C whereby crude hydroquinone is sublimed, and thereafter a mixed gas consisting of the sublimed vapor and the carrier gas is introduced into a condenser at a temperature at about 25.degree.-90.degree.C whereby the hydroquinone only is fractionally solidified. After the sublimation purification, hydroquinone of high purity can be collected.