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Copper Penny in Nitric Acid

Marcus Williams
in Applied Chemistry

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Today I asked my professor if we could perform the experiement when you submerge a copper penny in nitric acid. He said that he would consider doing it if I provided an etching. I don't possess that much knowledge on etchings, but could someone explain to me what they are and what the best ones would be for such an experiment and if at all possible the least expensive? Thanks in advance!

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