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Toning or Corrosion

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Allan C Ong

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Coloration on some silver proof quarters...

I'm finding some of my Silver Quarter proofs some orange/brown coloration showing. Is this the coin getting toned or am I seeing the beginnings of corrosion? I was thinking of sending them in for slabbing but I don't know if I want to pay $12.50 for NGC to tell me that it's a no-grade...

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