Patent ID: 8741046

Claim:
An ink composition containing at least one kind of a compound represented by the following formula (1) or a salt thereof as a coloring matter (I): wherein, R 1 to R 8 each independently represent a hydrogen atom; a halogen atom; a sulfo group; a carboxy group; a sulfamoyl group; a carbamoyl group; a C1-C4 alkyl group; a C1-C4 alkoxy group; a C1-C4 alkoxy group substituted with at least one group selected from the group consisting of a hydroxy group, a C1-C4 alkoxy group, a hydroxy-C1-C4 alkoxy group, a sulfo group and a carboxy group; a C1-C4 alkylcarbonylamino group; a C1-C4 alkylcarbonylamino group substituted with a carboxy group; a ureido group; a mono-C1-C4 alkylureido group; a di-C1-C4 alkylureido group; a mono-C1-C4 alkylureido group substituted with at least one group selected from the group consisting of a hydroxy group, a sulfo group and a carboxy group; a di-C1-C4 alkylureido group substituted with at least one group selected from the group consisting of a hydroxy group, a sulfo group and a carboxy group; a benzoylamino group; a benzoylamino group having its benzene ring substituted with at least one group selected from the group consisting of a halogen atom, a C1-C4 alkyl group, a nitro group, a sulfo group and a carboxy group; a benzenesulfonylamino group; or a phenylsulfonylamino group having its benzene ring substituted with at least one group selected from the group consisting of a halogen atom, a C1-C4 alkyl group, a nitro group, a sulfo group and a carboxy group; and X represents a divalent crosslinking group, and an azo compound having λmax in a range of 550 to 660 nm as a coloring matter (II).