Azo compound, ink composition and colored article

An azo compound represented by Formula (1) as shown below or a salt thereof,

• wherein, each of R1, R2, R5, R6 and R7 independently represents a hydrogen atom, a halogen atom, a cyano group, a hydroxyl group, a carboxyl group, a sulfo group, a sulfamoyl group, an N-alkylaminosulfonyl group, an N-phenylaminosulfonyl group, a (C1 to C4) alkylsulfonyl group which may be substituted by a hydroxyl group, a phospho group, a nitro group, an acyl group, a ureide group, a (C1 to C4) alkyl group which may be substituted by a hydroxyl group or a (C1 to C4) alkoxy group, a (C1 to C4) alkoxy group which may be substituted by a hydroxyl group, a (C1 to C4) alkoxy group, a sulfo group or a carboxyl group, an acylamino group, an alkylsulfonylamino group or a phenylsulfonylamino group which may be substituted by a halogen atom, an alkyl group or a nitro group, each of R3 and R4 independently represents a hydrogen atom, a halogen atom, a cyano group, a carboxyl group, a sulfo group, a nitro group, a (C1 to C4) alkyl group which may be substituted by a hydroxyl group or a (C1 to C4) alkoxy group, a (C1 to C4) alkoxy group which may be substituted by a hydroxyl group, a (C1 to C4) alkoxy group, a sulfo group or a carboxyl group, an acylamino group, an alkylsulfonylamino group or a phenylsulfonylamino group which may be substituted by a halogen atom, an alkyl group or a nitro group, and n represents 0 or 1, respectively.