Anodizing is an electrochemical process some jewelers use to change the color of metals such as titanium, aluminum, and niobium. Dipping a reactive metal into a "bath" mixture of low-sudsing detergent ...
My anodized-titanium card case is deep blue when I hold it normal to my line of vision. But rotating the case changes its color, eventually reaching a nice shade of violet. Why does the object change ...
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