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The color of your titanium
jewelry is not
paint

The color of titanium is not paint, nor is any other pigment applied.
Refractory metals (such as titanium, tantalum, and niobium) have a unique relationship with oxygen. Oxygen causes a structural change in the metal's surface crystals creating an oxide. This oxide is as hypoallergenic as the titanium itself, but with unique light refractory properties. Using electricity to force oxygen onto the surface of the metal thus thickening the oxide layer enough for a visual color change. At this point, white light becomes diffused into various colors - like a rainbow, oil on water, or a peacock's feather. The blending of various colors is a combination of the voltage used and the length of exposure.
Controlling and varying the electrical exposure to achieve various colors of blue, pink/purple, turquoise and green. Although coloration sounds simple, the initial surface preparation is very time and labor intensive.
About titanium jewelry:
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