An air-oxidation haircolor composition is based: a) water b) water soluble metal salt as a catalyst c) etidronic acid (1-hydroxyethane-1,1-diphosphoric acid) as a chelating agent and color deposition enhancer d) oxidation primary dye intermediates e) an aromatic triol such as 1,2,4-Benzenetriol f) auxiliary oxidation dye couplers g) dye antioxidants and stabilizers h) optionally and a water soluble surfactant i) optionally and a water soluble anionic polymer j) a water soluble solvent system and k) an alkalizer.