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Understood Robbie , olive oil is a super slow method and its results are not usually that great after months in the jar . Unfortunately salts , oxygen and fertilizers are the worst for copper coins .

As Chris mentioned Salt water and copper and sometimes silver don't do well together , I m afraid you coin might be pretty done by the elements . When ever you see bright reddish exposed copper is...

Robbie , please give us better pictures to see the coin's surface , metal color and detail . It will help a lot . For future reference I am not a big fan of olive oil as it really doesn't do much for...