@scuba, I wonder if the metal is from this coin being in a fire. On clad coins, it can cause bubbling and similar staining. Not sure though--I'm interested to hear others' thoughts.
"If you climb a good tree, you get a push." -----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed." -----King Adz
I'm thinking more of something that has spilled on it and dried. If so it will come off with soap and water, Make sure they are totally dry. Then they can be spent again, so spend them as they are. Just face value coins.
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