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The surface of aluminium, magnesium and titanium can be anodised to form a protective oxide layer. It is naturally light grey, but can be electrolytically coloured, or dyed with a range of vivid colours including red, green, blue, gold, bronze and black. The process builds up the naturally occurring oxide layer on the surface of the metal. The film is hard, protective and self-healing; aluminium oxide is inert and among the hardest materials known to man. Anodising is used to protect and enhance metals for both indoor and outdoor use. Indeed, most aluminium in the automotive, construction, leisure and consumer electronics industries is treated in this way.