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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.
My Collection of Old Holders
Never a slave to one plastic brand will I ever be.
^ What they said.
Disclaimer: I'm not a dealer, trader, grader, investor or professional numismatist. I'm just a hobbyist. (To protect me but mostly you! 🤣 )
Strong acid 💀
BST: endeavor1967, synchr, kliao, Outhaul, Donttellthewife, U1Chicago, ajaan, mCarney1173, SurfinHi, MWallace, Sandman70gt, mustanggt, Pittstate03, Lazybones, Walkerguy21D, coinandcurrency242 , thebigeng, Collectorcoins, JimTyler, USMarine6, Elkevvo, Coll3ctor, Yorkshireman, CUKevin, ranshdow, CoinHunter4, bennybravo, Centsearcher, braddick, Windycity, ZoidMeister, mirabela, JJM, RichURich, Bullsitter, jmski52, LukeMarshall, coinsarefun, MichaelDixon, NickPatton, ProfLiz, Twobitcollector,Jesbroken oih82w8, DCW
Thanks all.
I've made plenty of these, too, when dorking around in the lab. It's absolutely been acid treated.
In honor of the memory of Cpl. Michael E. Thompson
What they all said