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Thanks for the link. That is exactly what our concern is - chemical alteration. One dealer said there is a chemical test that can be done to determine if the penny has been chemically altered however if it proves negative the new chemical will have ruined the "unaltered" state of the original coin. There is a greater probability it has been altered - but on the per chance!! - why not check it out.
I found it very interesting that an obvious instructor would encourage students to alter US coinage. I thought that was illegal?
Thanks for the info and suggestion of a jeweler - I'll give that a try.
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