| abstract |
The use of a simple or polymeric mineral or organic magnesium salt in a method for dyeing keratin fibres, particularly human hair, in which the dyeing agent is 5,6-dihydroxyindole and/or a derivative thereof having formula (I), wherein R1, R2, R3 and R4, which are the same or different, are hydrogen or C1-4 lower alkyl, R1, R2 and R3 being hydrogen when R4 is C1-4 alkyl. |