TRISAZO COMPOUND, INK COMPOSITION, RECORDING METHOD AND COLORED BODY

摘要

Disclosed is a dye compound for black ink which has high solubility in a medium mainly composed of water. A high-concentration aqueous solution and an ink of the dye compound for black ink are stable even after long storage. The dye compound for black ink enables a printed image to have an extremely high density, without causing bronzing even when the image is formed with a high-concentration solution. In addition, the dye compound for black ink is capable of forming a black recorded image which has excellent fastness, especially excellent light resistance and ozone gas resistance. Also disclosed is an ink composition of such a dye compound for black ink. Specifically disclosed is a trisazo compound represented by the formula (1) below or a salt thereof. (1) (In the formula (1), n represents 0 or 1; group A represents a 2-naphthothiazolyl group; R1 represents a substituted C1-C4 alkyl group or the like; R2 represents a cyano group or the like; R3 and R4 independently represent a hydrogen atom, a sulfo group or the like; and R5-R7 independently represent a hydrogen atom, a substituted C1-C4 alkyl group, a substituted C1-C4 alkoxy group or the like.)