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<p>[QUOTE=&quot;Kentucky, post: 8524503, member: 33176&quot;]Kind of depends on how you define &quot;damage&quot;.&nbsp; Copper based coinage tends to form a layer or deposit on the surface which is kind of &quot;spongey&quot; probably due to the formation of oxides.&nbsp; You see this very often in ancient coins and sometimes in not so ancient.[/QUOTE]</p><p><br /></p>

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