What Is the Green Stuff on Pennies?
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It is best not to clean rare coins as removing the patina can significantly reduce the value of them. For this reason, most coin hobbyists almost never clean their coins. In fact, 99% of coins do not increase in value after you clean them, but many will be greatly devalued.
James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.
