| 摘要 |
A subject-matter of the present invention is the use, in the colouring of keratinous fibres, of a specific anionic hydrotropic agent of formula: in which X represents CH or N, n represents an integer varying from 0 to 12, R<SUB>1 </SUB>represents COOM or SO<SUB>3</SUB>M, R<SUB>2 </SUB>represents a hydroxyl or a C<SUB>1</SUB>-C<SUB>4 </SUB>alkyl, R<SUB>3 </SUB>represents hydrogen or a C<SUB>1</SUB>-C<SUB>4 </SUB>alkyl, R<SUB>2 </SUB>and R<SUB>3 </SUB>can together form a ring and M represents hydrogen or one or more inorganic cations providing the electrical neutrality of the compound of formula (I). The invention likewise relates to a dyeing composition comprising at least one dye and such an anionic hydrotrope and to colouring processes employing this dyeing composition.
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