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<p>[QUOTE=&quot;BadThad, post: 1805353, member: 17261&quot;]Asked to voice my opinion here....</p><p>&nbsp;</p><p>No matter the name, verdigris, bronze disease, etc., it&#039;s all the essentially the same thing. Verdigris is corrosion that forms from the reaction of copper with an anion. The composition can vary widely and be VERY complicated. Nonetheless, the basics of initial formation is identical - water and air (feed materials) start the reaction. Ancient coins can be extremely complicated because you can form copper-based minerals - which are very, very hard. Again, it&#039;s a simple evolution of verdigris - it changes based on the feed materials, time, temperature and pressure.</p><p>&nbsp;</p><p>As for a &quot;protective patina&quot;, that is basically correct in that all of the copper surface becomes reacted leaving little room for new reactions to occur (the statue of Liberty is a good example). Nonetheless, the corrosive reaction will still continue on a slower scale. Unless all feed materials are removed from the equation you cannot completely stop the process unless you store your copper in a perfect vacuum.[/QUOTE]</p><p><br /></p>

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