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<p>[QUOTE=&quot;desertgem, post: 522917, member: 15199&quot;]Joe, if you take it out of the holder, is the center of the spot raised? I have seen similar on copper and silver coins where some organic deposit produced an acidic component which migrated outward to cause the tarnish. I swear sometimes it is insect debris.&nbsp; If it was long enough, the debris has decomposed, so just the tarnish is left.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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