| 摘要 |
Disclosed herein are novel heteroaromatic binuclear direct dyes, dye compositions containing these dyes and also a process for dyeing keratin fibers using them. In particular, the invention relates to heteroaromatic binuclear direct dyes comprising a pyridine nucleus. With these novel dyes, black shades that show good fastness can be obtained, and they also may show good stability in dye compositions.
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