| abstract |
Process for dyeing keratin fibers comprising the application to these fibers of a composition containing, in a medium suitable for dyeing, at least one indole derivative and at least one substituted 2-nitro-paraphenylenediamine chosen from N- (beta -hydroxyethyl) 1-amino-2-nitro N ', N' - (bis-beta-hydroxyethyl) 4-amino benzene and N- (beta-hydroxyethyl) 1-amino-2-nitro-4-amino benzene, the color being revealed by an oxidizing system consisting of: (i) iodide ions and hydrogen peroxide, (ii) nitrites, (iii) oxidants chosen from periodic acid and periodates, sodium hypochlorite, ferricyanide potassium, silver oxide, Fenton's reagent, lead oxide IV and cesium sulfate V, (iv) or else a permanganate or a dichromate. |