Dyeing compositions for keratin fibres containing meta-phenylenediamines
申请人:L'Oreal
公开号:US04330292A1
公开(公告)日:1982-05-18
The invention resides in the use of the compounds having the formula given below, or an acid salt thereof, as couplers in dyeing compositions for keratin fibres which contain an oxidation base: ##STR1## in which formula n is equal to 2, 3 or 4 and R.sub.1 and R.sub.2 are identical or different and represent an alkyl group having from 1 to 4 carbon atoms.