Don't net grade the coins if they show a bit of green (corrosion) on them. I'm curious about their technical grades. Is there anything else, other than the corrosion that will limit their market value? I will work to carefully remove the corrosion by bathing in denatured alcohol for an extended period of time (a short bath didn't do the job). I might have to resort to a very, very long term bath in olive oil.
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