Electrocolouring is an electrochemical process which allows the deposition of tin salts in colloidal form in the pores of the oxide layer obtained in the previous anodization. It can be made on layers of oxide of different thickness ensuring dark shades even on the lowest thickness; the metal colloid is deposited on the bottom of the oxide pores with protective effects against atmospheric and chemical agents making the material suitable for outdoor use. The fixing can be either cold or hot
The obtainable colours are CHAMPAGNE, BRONZE and BLACK.