Metal Coloured
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Metal Coloured

how is metal coloured?
The thermos mug by nissan has coloured versions and i would like to know how it is done.
I had a short look what that brand looks like and all I could see was stainless steel. I think often stainless steel mugs have a color coat by some transparent colored plastic. If the item is made from aluminum they are anodyzed which is a process which allows to apply dye to aluminum. For steel it would be largely paints and coatings. Powder coating is also something which is frequently applied to steel (it's basically a thin and tough plastic coat which is applied as a powder.