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They are not turned into metal. Rather, they are melted into a genetic slush which is the filling for the metal. The metal is more like the skeleton for the Human Reaper.
Silver in the fine powder form is black, that is happening on slight friction of silver metal, which is soft
Pony was a greaser and Cherry was a Soc.
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You are most likely referring to silver which will tarnish with time and often turns black (although depending on the composition of the gas its exposed to it can turn any colour of the rainbow)
Silver Oxide forms on the surface. The only metal that does not Oxidize is Gold.
copper,and some precious metals, when exposed to air, turn black, like silver(completely turns black when exposed to air),gold(black spots appear),and others,maybe platinum.
There is no 'uniform' for Heavy Metal, and makeup is more common to wannabe Glam Rock than it is to true Metal (corpse paint and such used by the Black Metal sorts notwithstanding). Heavy Metal is in part about individuality. Trying to turn it into a uniformed thing is completely anathema to that.
the teeth turn red
Magnesium is a metal
You are either born black or not, and you can't simply "turn" black at will.
because if they get old they turn black