申请人:Sao Akihito
公开号:US20110092624A1
公开(公告)日:2011-04-21
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 R
1
to R
4
are independently an alkyl group which contains one or more carbon atoms, which may be branched, and which may have a phenyl substituent and R
6
is a methyl group, a hydroxyl group, or a proton.