Ink composition and ink set

An ink composition, comprising:

• as dyes,
• a dye (Bk-1) represented by the following formula (Bk-1);
• a dye (Bw-1) represented by the following formula (Bw-1);
• a dye (Y-1) represented by the following formula (Y-1);
• and
• a dye (Y-2) represented by the following formula (Y-2):
• wherein, R4 represents a substituent, R5 represents —OR6 or —NHR7, R6 and R7 represents a hydrogen atom or a substituent, X, represents a bivalent linking group, n0 is 0 or 1, Ar3 represents a bivalent hetero ring group, and Ar4 represents an alkyl group, an aryl group or a triazine group:
• wherein, R1 represents a hydrogen atom or a substituent, R2 represents a substituent, R3 represents an alkyl group which may form an ionic hydrophilic group or a ring, n4 is 0 to 4, and n5 is 2 to 5,
• wherein the content ratio A (dye (Bk-1):dye (Bw-1)) of the dye (Bk-1) and the dye (Bw-1) is 100:18 to 100:40;
• wherein the content ratio B (dye (Bk-1):dye (Bw-1):dye (Y-1):dye (Y-2)) of the dye (Bk-1), the dye (Bw-1), the dye (Y-1), and the dye (Y-2) is 100:20:5:5 to 100:40:12:12, and
• a total content of the dyes is more than 0.50 to 1.5 mass %:
• wherein, R1, R2, R5, R6, and R7 each independently represent a hydrogen atom, a halogen atom, a cyano group, a hydroxyl group, a carboxyl group, a sulfo group, a sulfamoyl group, an N-alkyl aminosulfonyl group, N-phenyl-aminosulfonyl group, a (C1-C4) alkylsulfonyl group which may be substituted with a hydroxyl group, a phospho group, a nitro group, an acyl group, a ureido group, a (C1-C4) alkyl group which may be substituted with a hydroxyl group or a (C1-C4) alkoxy group, a (C1-C4) alkoxy group in which the alkyl group may be substituted with a hydroxyl group, a (C1-C4) alkoxy group, a sulfo group or a carboxyl group, an acylamino group, an alkylsulfonylamino group or a phenyl-sulfonylamino group in which the phenyl group may be substituted with a halogen atom, an alkyl group or a nitro group, R3 and R4 each independently represent a hydrogen atom, a halogen atom, a cyano group, a carboxyl group, a sulfo group, a nitro group, a (C1-C4) alkyl group which may be substituted with a hydroxyl group or a (C1-C4) alkoxy group, a (C1-C4) alkoxy group in which the alkyl group may be substituted with a hydroxyl group, a (C1-C4) alkoxy group, a sulfo group or a carboxyl group, an acylamino group, an alkylsulfonylamino group or a phenylsulfonylamino group in which the phenyl group may be substituted with a halogen atom, an alkyl group or a nitro group, and n represents 0 or 1:
• wherein, R21, R22, R23, R24, R25, R26, R27, and R28 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 with;
• a (C1-C4) alkoxy group which is substituted with at least one group selected from a group consisting of a hydroxy group, a (C1-C4) alkoxy group, a hydroxy(C1-C4) alkoxy group, a sulfo group, and a carboxy group as a substituent;
• 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 as a substituent;
• 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 as a substituent;
• a benzolamino group;
• a benzolamino group in which a benzene ring is 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 in which a benzene ring is substituted with at least one group selected from a halogen atom, a (C1-C4)alkyl group, a nitro group, a sulfo group, and a carboxy group;
• and X represents a bivalent crosslinking group.