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<p>[QUOTE=&quot;cdcda, post: 44531, member: 941&quot;]I used the term &quot;altered&quot; to reference the fact that the surface had changed due to a reaction to chemicals that were either naturally present in the environment in which it was stored, or in some cases could have been artificially introduced.</p><p><br /></p><p>As for stabilizing the coins, and this was a perfect choice of words, this is not something to be attempted to the average collector or dealer. There are companies which provide this service.</p><p><br /></p><p>In the case of the coins pictured, some of which exhibit what is commonly referred to as &quot;Bronze Disease&quot; check out the following link for some information on how it occurs and can be stabilized...</p><p><br /></p><p><a href="http://nautarch.tamu.edu/class/anth605/File12.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://nautarch.tamu.edu/class/anth605/File12.htm" rel="nofollow">http://nautarch.tamu.edu/class/anth605/File12.htm</a>[/QUOTE]</p><p><br /></p>

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