Few chemical or industrial processes that could possibly be mistaken for magic, but anodising metals, especially aluminium, definitely qualifies. Not only does the process thicken the oxide coating on the metal, it can be used to infuse the item with a range of beautiful colours and shades that will not run or fade over time. Aluminium oxide is harder and therefore more durable, offers a degree of electrical insulation, and is relatively inert, which means that the metal will not affect nor be affected by any other compounds that it may be exposed to.
This type of metal finishing can be used for a range of purposes, from industrial to domestic. The products that can be anodised for practical purposes include screws, nuts and bolts, and plumbing pipes and clips.