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Yeah, PbO is poisonous, but not quickly. I think they used it in 18th century for makeup when it was rather fashionable to be white/pale because it indicated you're really an aristocrat who doesn't...

Chromium is Chromium, Lead is Lead, and Chromium Oxide or Lead Oxide is different from the metal.
Whether something is good or bad depends on biochemistry, i.e. how does the specific chemical...