Why are tattoos permanent?
Chemistry For Your Life
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Is the FDA Regulating Cosmetics?
Be careful if you're planning on getting a tattoo. Ask your artist about where they get their pigments, and if it's regulated by any entity. If you have a known aalergy to some heavy metal or something, you could be negatively affected by that ink being in your skin. There is not really evidence of heavy metal toxicity or anything incredibly dangerous that's resulted from tattoos right now.
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