Origins
Anodization first arose in the early 1920s to protect sea planes from rust and corrosion. Later, it was widely used in Germany in the mid-century for achitectural applications. While newer technology (e.g. plastics) has made some anodization processes obsolete, anodization is still used in a variety of industries, including the military and the art world.

Coloring Anodized Materials
Anodized surfaces hold hues well because the anodization process leaves behind a porous surface that readily drinks up the dye. Anodized metals can be dyed anything from beige to ebony, although this is somewhat dependent on the metal that has been anodized. Titanium and niobium especially hold tints effeciently and beautifully. Some gadgets that are dyed after the anodization process include carabiners (the kind used for climbing or just for holding keys) as well as iPods. Aesthetic effects are also possible using dyes, include spotting and splash effects.

Which Metals Are Appropriate for the Anodization Process
While mainly alloys, especially aluminum alloys, are anodized, singular metals are also commonly treated in this manner. Magnesium, titanium, tantalum, and niobium are all anodized. Zinc is also anodized, but this is rarely done. Most notably, niobium can hold many attractive colors and is often used in commemorative coins or jewelry. Magnesium is anodized as a primer for paint; this process helps the painted material hinder corrosion, especially when the item that has been painted is also metallic. Further, the anodization process also helps the paint stick to its intended object.

Titanium is known, amongst other items, for its role in creating beautiful wedding bands; this bands are particularly gorgeous due to the anodization process the titanium under goes before becoming a ring, giving the metal a particular sheen not comparable to any other jewelry metal. Titanium’s ability to retain dye also makes it a grand prospect for many other kinds of jewelry – anything from costume jewelry to body piercings.