Can you make red anodized titanium Jewelry?

The short answer is: “No.”

In detail, the colors are caused by a particular trick of physics: Optical Interference. As is described in detail on this page, the colors are limited by the behavior of photons. There is no dye or coloring agent to give us precise control.

Red, in particular, cannot be produced because it’s wavelength is twice as long as blue. So if the interference allows red, it also allows the shorter blue through. This creates the secondary color called Magenta, red-violet, or purple.

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