| 摘要 |
An ink composition contains C. I. Acid Blue 290 as a colorant and water. In the ink composition, C. I. Acid Blue 290 is contaminated with a by-product produced during the production of C. I. Acid Blue 290 and is represented by Formula (I) below, the by-product is represented by Formula (II) below, and the content of the by-product is 120 ppm or less: where R1 to R4 are independently an alkyl group which contains one or more carbon atoms, which may be branched, and which may have a phenyl substituent and R6 is a methyl group, a hydroxyl group, or a proton.
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