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<p>[QUOTE=&quot;iamtiberius, post: 2190036, member: 37707&quot;]That&#039;s what I&#039;ve gathered from what I&#039;ve found online.&nbsp; Whatever small amounts of other metals the coin has been alloyed with has reacted with certain chemicals present in the soil, over a long period of time.&nbsp; I read one article that said this type of toning is typical of hoards. Due to the outer layer of coins forming a barrier,&nbsp; and the gasses emitted from whatever reaction is taking place on that barrier is trapped within for long amounts of time. Hence,&nbsp; the toning reaction with a small amount of reactable metals.[/QUOTE]</p><p><br /></p>

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