Anodizing titanium creates an oxide layer, the thickness of which varies with the voltage used. The thickness of that oxide layer determines which wavelengths o

Anodizing titanium creates an oxide layer, the thickness of which varies with the voltage used. The thickness of that oxide layer determines which wavelengths of light it refracts [0]. In practical terms, your choices for color are pretty limited[1]. I'm not a chemist, but I looked into this years back when I was wondering why everything titanium is offered in the same couple of colors. Personally, I like the plain gray. [0] https://wisensemachining.com/titanium-anodizing-guide/ https://wisensemachining.com/titanium-anodizing-guide/ [1] https://www.snowpeak.com/collections/cups/products/ti-single-450-cup?variant=32400810442796 https://www.snowpeak.com/collections/cups/products/ti-single...