| 摘要 |
Use of an insoluble pigment obtained by the oxidative polymerisation of an indole compound of formula (I) in which R<1> and R<3> are hydrogen or alkyl; R<2> is hydrogen, alkyl, carboxyl or alkoxy carbonyl; R<4> and R<7> are hydrogen, hydroxy, alkyl, amino, alkoxy, acyloxy or acylamino; R<5> is hydrogen, hydroxy, alkoxy, alkyl, halogen, amino, acyloxy, acylamino or trimethylsilyloxy; R<6> is hydrogen, hydroxy, alkoxy, amino, acyloxy, acylamino, trimethylsilyloxy or hydroxyalkylamino; R<5> and R<6> can also form, together with the carbon atoms to which they are attached, a carbonyl-dioxy ring; at least one of the radicals R<4> to R<7> is an OZ or NHR<8> grouping, the R<8> radical of the NHR<8> grouping being hydrogen, acyl or hydroxyalkyl and the Z radical of the OZ grouping being hydrogen, acyl, alkyl or a trimethylsilyl group. The pigment of the invention is useful in the temporary dyeing of keratin fibres.
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