Make A Hollow Penny!

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Using only one common chemical, completely remove the zinc core from a modern US penny, leaving just a thin...
Using only one common chemical, completely remove the zinc core from a modern US penny, leaving just a thin copper shell! An amazingly simple, cheap, and stunning experiment. Sure to impress your friends and family. If you would like to see more videos like this one from ARC Science, please leave a comment below! Thanks, and enjoy!
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