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.87 gram dime?
I have a dime that is copper In color .87 g is thin and has ridges on sides any ideas what would cause this. 
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I have a dime that is copper In color .87 g is thin and has ridges on sides any ideas what would cause this.
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Acid.
^ What he said.
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^ What they said.
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Strong acid 💀
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Might have been me. I've made a lot of them over the years. Lol. Nitric acid will do that in a minute or less.
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Thanks all.
I've made plenty of these, too, when dorking around in the lab. It's absolutely been acid treated.
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All comments reflect the opinion of the author, even when irrefutably accurate.
What they all said