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Message:: [QUOTE="red_spork, post: 2703711, member: 74282"]Looking at the "before" picture closer I tend to agree with Ken. I think there was just active corrosion going on underneath the coating both on the edge and in scattered places across the coin. The coating held it all in place until the acetone removed it which led to the coin we see now. I have never seen a coin in-hand with this problem but I have heard of the phenomenon from various dealers a few times. That said, some very tricky alterations do exist out there. Andrew McCabe illustrates a bronze coin in his collection <a href="https://m.flickr.com/#/photos/ahala_rome/5585497257/sizes/m/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://m.flickr.com/#/photos/ahala_rome/5585497257/sizes/m/" rel="nofollow">that disintegrated from an attempt to treat BD</a> as well as the <a href="https://m.flickr.com/#/photos/ahala_rome/6041332178/sizes/m/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://m.flickr.com/#/photos/ahala_rome/6041332178/sizes/m/" rel="nofollow">sealed and repaired coin</a>.[/QUOTE]