Anatometal’s titanium jewelry can be anodized to 16 different colors, and Niobium jewelry can be anodized to 18.
Those colors are created through a process of electrolytic oxidation called anodization, which generates interference colors. Interference colors is a very interesting effect that is often observed in thin transparent films, where the light is reflected both by the film and by the surface below. This effect is also at the base of the iridescent colors seen on some beetles or butterflies and when a thin layer of oil is suspended on water.
Unlike other coloring processes, no coating or pigments are used, leaving the jewelry safe to be worn in initial piercings or on allergy-prone people.
Even though the covering oxide is harder than the metal itself, because of its extreme thinness simple friction will wear off over time; the jewelry will eventually return to its original colorless state. Style, shape and frequency of usage will determine how long the color will last.
Please note that while anodization can be accurately controlled several factors can affect the way the light is reflected titanium and with it the perceived color.