An ink composition comprising at least one kind of coloring matter (I), which is a coloring matter represented by the following formula (1), a tautomer thereof, or a salt of the coloring matter or the tautomer;
- at least one kind of coloring matter (II), which is a coloring matter represented by the following formula (2), or a salt thereof;
- and a coloring matter (III), which is a coloring matter having an azo group other than coloring matters (I) and (II), or a salt thereof:
- wherein,
- R1 represents a (C1-C4) alkyl group;
- a (C1-C4) alkyl group substituted with a carboxy group;
- a phenyl group;
- a phenyl group substituted with a sulfo group;
- or a carboxy group,
- R2 represents a cyano group;
- a carbamoyl group;
- or a carboxy group,
- R3 and R4 each independently represent a hydrogen atom;
- a (C1-C4) alkyl group;
- a halogen atom;
- a (C1-C4) alkoxy group;
- or a sulfo group,
- R5 represents a (C1-C4) alkylthio group;
- or a (C1-C4) alkylthio group substituted with at least one kind of group selected from the group consisting of a hydroxy group, a sulfo group, and a carboxy group,
- R6 represents a (C1-C4) alkylcarbonylamino group,
- R7 represents a (C1-C4) alkylthio group;
- or a (C1-C4) alkylthio group substituted with at least one kind of group selected from the group consisting of a hydroxy group, a sulfo group, and a carboxy group,
- R8 represents a (C1-C4) alkylcarbonylamino group,
- R9 and R10 each independently represent a hydrogen atom;
- a carboxy group;
- a sulfo group;
- an acetylamino group;
- a chlorine atom;
- a (C1-C4) alkyl group;
- a (C1-C4) alkoxy group;
- or a (C1-C4) alkoxy group substituted with at least one kind of group selected from the group consisting of a hydroxy group, a (C1-C4) alkoxy group, a sulfo group, and a carboxy group, and
- R11 to R13 each independently represent a hydrogen atom;
- a carboxy group;
- a sulfo group;
- a hydroxy group;
- an acetylamino group;
- a chlorine atom;
- a cyano group;
- a nitro group;
- a sulfamoyl group;
- a (C1-C4) alkyl group;
- a (C1-C4) alkoxy group;
- a (C1-C4) alkoxy group substituted with at least one kind of group selected from the group consisting of a hydroxy group, a (C1-C4) alkoxy group, a sulfo group and a carboxy group;
- a (C1-C4) alkylsulfonyl group;
- or a (C1-C4) alkylsulfonyl group substituted with at least one kind of group selected from the group consisting of a hydroxy group, a sulfo group, and a carboxy group,
- wherein,
- Ra represents a hydrogen atom;
- a hydroxy group;
- a carboxy group;
- an unsubstituted (C1-C4) alkyl group;
- a (C1-C4) alkyl group substituted with a hydroxy group or a (C1-C4) alkoxy group;
- an unsubstituted (C1-C4) alkoxy group;
- a (C1-C4) alkoxy group substituted with a hydroxy group or a (C1-C4) alkoxy group;
- an unsubstituted (C1-C4) alkylamino group;
- a (C1-C4) alkylamino group substituted with a hydroxy group or a (C1-C4) alkoxy group;
- a carboxy-(C1-C5) alkylamino group;
- a bis(carboxy-(C1-C5) alkyl)amino group;
- an unsubstituted (C1-C4) alkanoylamino group;
- a (C1-C4) alkanoylamino group substituted with a hydroxy group or a (C1-C4) alkoxy group;
- an unsubstituted phenylamino group;
- a phenylamino group having the benzene ring substituted with at least one kind of group selected from the group consisting of a carboxy group, a sulfo group, and an amino group;
- a sulfo group;
- a halogen atom;
- or a ureido group, and
- X represents an aliphatic amino group substituted with a carboxy group or a sulfo group.