An aluminium part, when made the anode in an electrolytic cell, forms an anodic oxide on the surface of the aluminium. By utilizing this process, known as anodising, the aluminium metal can be used in many applications for which it might not otherwise be suitable. The anodising process forms an oxide film, which grows from the aluminium base as an integral part of the metal. This oxide film is porous to dyes and allows printing on to the aluminium surface with high definition. Once the dying process has been carried out the print is then sealed in the anodic surface. This imparts to the aluminium surface a hard, corrosion-, chemical- and abrasion-resistance with excellent wear properties, resulting in high durability.