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<p>[QUOTE=&quot;-jeffB, post: 4016921, member: 27832&quot;]That could happen because one part of the mix is more or less reactive than the rest. Or it could be that something corrosive landed on the coin in that pattern, or that something <i>protective</i> landed in that pattern before the coin got exposed to the corrosive agent.[/QUOTE]</p><p><br /></p>

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