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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If I recall correctly it’s because plastic is porous, i.e. able to absorb liquid, but metal is non porous and can’t absorb anything. Think of it like a sponge ball versus a glass ball. The sponge will absorb plenty of liquid and can hold the color of the dye. But the glass ball, even if melted down, can’t actually absorb any liquid and it ends up with things like air bubbles and other annoyances.
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