It seems that we can add dye to plastics and get coloured plastics. Why can’t we just do the same with molten metal and get coloured metal? Rather, It seems like all the metal I have ever owned is just painted on the exterior of the item, and is vulnerable to flaking and being scratched off.
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Paint on metal is usually for corrosion resistance. There are other ways to achieve this, but an isolating top layer of paint is easy, cheap, and effective, for many purposes.
Mixing a dye into molten metal is really hard as the temperature for iron to actually smelt and be liquid are incredibly high, and i don’t think that:
1: the dye would survive that temperature.
2: the dye would protect the metal from corrosion.
3: the dye probably won’t do anything, but worst case scenario, it could weaken the metal, rendering it unusable for the intended purpose.
So there are no real benefits to mix dye in and there may be adverse effects.
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