| 摘要 |
Provided is a hair dye composition containing a dissociative direct dye represented by the following formula (1): wherein, R<1 >to R<4 >each represents H or substituent, X represents OH or -NHSO2R<5>, R<5 >represents an alkyl, aryl or heterocyclic group, and A represents a divalent group capable of forming a methine dye as a whole compound, together with the portion other than A. The hair dye composition of the present invention is capable of strongly dyeing the hair with a vivid color tone without causing decomposition of the dye during the dyeing process, exhibits an excellent resistance against sunlight, hair washing, perspiration, friction and heat, has a high stability against an alkali agent and an oxidizing agent, has a high dyeing property, and has less color fade after the passage of time.
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