| 摘要 |
PROBLEM TO BE SOLVED: To provide a composition for hair dyeing, dyeing hair which is a keratin fiber originally containing tryptophan by carrying out chemical reaction of the hair with an aromatic aldehydes under an acid catalyst and being directly applicable to the human hair. SOLUTION: The composition for hair dyeing contains the aromatic aldehydes and the acid catalyst, and pH of the composition is≤4. COPYRIGHT: (C)2008,JPO&INPIT
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