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2013 Proof Silver Eagle - What caused these circles in the field?
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<p>[QUOTE="TheFinn, post: 2917316, member: 90102"]Milk spots. Something got on the blank before striking or on the coin after striking and has corroded the silver. The whitish circles are the expansion of oxidation from the off-gassing reacting with the silver, like bacteria on a petrie dish. It has eaten into the silver and can't be removed.[/QUOTE]</p><p><br /></p>
[QUOTE="TheFinn, post: 2917316, member: 90102"]Milk spots. Something got on the blank before striking or on the coin after striking and has corroded the silver. The whitish circles are the expansion of oxidation from the off-gassing reacting with the silver, like bacteria on a petrie dish. It has eaten into the silver and can't be removed.[/QUOTE]
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