| 摘要 |
An agent for colouring keratin-containing fibres, in particular for human hair, is disclosed, comprising at least one oxocyclopentene derivative of formula (I), where R<1> and R<2> = H or a C1-4 alkyl group, R<3> and R<4> =H, a C1-4 alkyl, or aryl group; whereby the groups R<1> and R<2>, or R<3> and R<4> can also form a ring together and X = a C=O, C=S, or CH2 group. |
