Process for dyeing keratinous fibres employing an indole dye and at least one para-phenylenediamine containing a secondary amino group absent an oxidant other than air

Claim 1

A process for dyeing keratinous fibers comprising applying to said fibers in an amount effective to dye said fibers a dyeing composition comprising, in an aqueous medium (a) an indole dye present in an amount ranging from 0.1 to 5 percent by weight relative to the total weight of said composition, and (b) a paraphenylenediamine monosubstituted on one of the amino groups and having the formula ##STR7## wherein R 12 represents hydrogen or lower alkyl, R 13 represents hydrogen, lower alkyl, lower alkoxy or halogen and R 14 represents hydrogen, lower alkyl, lower alkoxy or halogen and occupies any one of the remaining positions of the benzene ring, and the acid addition salts thereof, said paraphenylenediamine being present in an amount ranging from 0.05 to 1 percent by weight relative to the total weight of said composition, and permitting said composition to remain in contact with said fibers for a time sufficient to develop in the air a coloration of said fibers without the addition of an oxidizing agent or oxidation catalyst other than air.