. An air-oxidation haircolor composition is based : a) water； b) water soluble metal salt as a catalyst； c) etidronic acid (l-hydroxyethane-l,l-diphosphonic acid) as a chelating agent and color deposition enhancer； d) oxidation primary dye intermediates； e) an aromatic triol such asl,2,4-Benzenetriol； f) auxiliary oxidation dye couplers； g) dye antioxidants and stabilizers； h) optionally, a water soluble surfactant； i) optionally, a water soluble anionic polymer； j) a water soluble solvent system； and k) an alkalizer.
