Composition for coloring of keratinous fibers comprises an oxidation base such as diamino-N,N-dihydropyrazolone derivatives (I) or their salts, a coupling agent and a polyol having 4-30 carbon atoms, in a medium. Composition for coloring of keratinous fibers comprises an oxidation base such as diamino-N,N-dihydropyrazolone derivatives of formula (I) or their salts, a coupling agent and a polyol having 4-30 carbon atoms, in a medium. Either R 1, R 2Q； Q : 1-10C alkyl (optionally substituted by OR 5, NR 6R 7, carboxy, sulfonic, CONR 6R 7, SO 2NR 6R 7, heteroaryl or T), T or 5-6 membered heteroaryl (optionally substituted by 1-4C alkyl or 1-2C alkoxy)； or NR 1R 25-7 membered heterocycle (optionally substituted by halo, amino, (di)1-4C alkyl amino, OH, COOH, carboxamido, 1-2C alkoxy or 1-4C alkyl (optionally substituted by OH, amino, (di)alkylamino, alkoxy, carboxy or sulfonyl))； either R 3, R 4H or Q； or NR 3R 4, NR 1R 25-7 membered heterocycle (where the carbons are optionally replaced by O or N and optionally substituted)； T : aryl (optionally substituted by 1-4C alkyl, OH, 1-2C alkoxy or (di)1-4C alkyl amino)； R 5H, 1-4C alkyl (optionally substituted by 1-2C alkoxy, OH, CONR 8R 9, SO 2R 8 or T) or T； R 6, R 7R 5, CONR 8R 9 or SO 2R 8； and R 8, R 9H, 1-4C alkyl (optionally substituted by OH or 1-2C alkoxy). Independent claims are also included for: (1) dyeing of keratinous fibers comprising application of the composition on fibers in the presence of an oxidizing agent； and (2) a device with several compartments comprising the composition and the oxidizing agent in different compartments. [Image].
