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Anodized

Many metals can be anodized, although Titanium and Niobium are the two most common body piercing metals to go through this chemical process.

Anodization is a chemical process that helps to protect the metal from corrosion and to change its colour properties. It works by electrically building up an oxide layer on the surface of the metal, which can be done at different thicknesses. The colour of the metal will be determined by the thickness of the oxide layer.