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[–] Grospoliner 0 points 1 point (+1|-0) ago 

You would have to know what the chemical was to make any assumptions about it's propagation through metabolization.

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[–] Doomking_Grimlock [S] ago 

I suppose a better question is, how the fuck does it last for years without eventually being replaced by his natural skin color as surface skin cells die and are replaced by new, healthy cells.

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[–] Grospoliner ago 

Well there is that skin disorder where you get patchy different areas and that's permanent.