| 摘要 |
The use of indolines of formula (I):in which R<1>, R<2>, R<3>, R<4 >and R<5 >independently of one another represent hydrogen or C1-4 alkyl groups, or R<4 >and R<5 >together with the oxygen atoms to which they are attached may represent an alkylenedioxy group containing 1 to 4 carbon atoms, or their salts, as oxidation dye precursors gives natural brown hair colorings. The indolines of formula (I) are also suitable as couplers in oxidation hair dyes with a conventional primary intermediate, in which they result in a modification of the tints obtainable with the primary intermediate. They are used in conventional carriers, e.g., in gel or emulsion form, preferably mixed before use or on the hair with an oxidizing agent to develop the color.
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