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.