| abstract |
SPECIFIC The 5-hydroxy 1,4-naphthoquinones responding to the general formula: (I) in which R1 and R2 are identical or different denote independently of each other a hydrogen atom, a methyl, methoxy, nitro or a halogen atom; R3 and R4 identical or different independently designate from each other a hydrogen atom, a hydroxyl group, methyl or methoxy; R5 denotes a hydrogen atom, a methyl or methoxy group provided that at least one substituents R1 or R2 is different from hydrogen when-that R3, R4 and R5 simultaneously denote a hydrogen atom, are used for dyeing human keratin fibers hands and especially hair. The hydroxynaphthoqui-nones of formula (I) have good dyeing power and a low sensitivity to oxidation. |