We do dye metals. Rose gold is gold dyed red by using copper. Similarly we do the same for white gold or bronze and brass.
A dye used on metals must be able to survive the melting point of metal and typically the only thing that can, is other metals. However, we don’t call these colored metals, we call them alloys. Alloying metals does a lot more than change their color so it’s not used in this way very often.
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