One of the most effective methods for metal colorization is, along with the organic pigment, the aluminium electro coloring method. After the workpiece is anodized, it is immersed in an acid solution containing metal salts and then subjected to an alternating current. Under these conditions, metal deposits develop in the form of oxides in the porous structure of the oxidized film, producing the characteristic color of the metal salt used, generally brown tones from champagne light brown to black.
Since 2008, Lualma Anodica has featured a new aluminium electro colorization system which measures 7,000mm in length and 1,250mm in height (usable dimensions). This system allows us to obtain special colorizations thanks to the pulse waves.