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How long would you say I should leave a coin submerged in it?
Also my mom claims that is nail polish remover tho I'm pretty sure you can't use that. Right? Where could I just get acetone from?
Up to 24hrs no problem, and probably longer. Acetone is harmless to metal.
.....and your mom is basically right, but nail polish remover usually isn't 100% pure acetone. You can get pure acetone at
Walmart in the nail polish section or paint section.