| 摘要 |
Powder consisting of inert inorganic particles having a particle size of less than 20 microns, containing on their surface a melanin pigment resulting from the oxidation of at least one indole dye of formula: <IMAGE> (I) in which: R1 is hydrogen, alkyl or -SiR9R10R11; R2 and R3 denote hydrogen, alkyl, carboxyl, alkoxycarbonyl or -COOSiR9R10R11; and R4 and R5 denote hydrogen, alkyl, formyl, acyl, alkenoyl, -SiR9R10R11, -P(O)(OR6)2; or R6OSO2, or alternatively R4 and R5 together with the oxygen atoms form a ring; R6 and R7 denoting hydrogen or alkyl, R8 denoting alkoxy or mono- or dialkylamino, R9 and R10 and R11 denoting alkyl.
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