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<p>[QUOTE=&quot;torontokuba, post: 1804311, member: 56793&quot;]I thought corrosion and green patina are two different things, at least from my perspective. Depending on the metal content, a copper coin can develop a healthy smooth greenish patina (much like a copper roof top), without much pitting and corrosion. After all, we do not replace copper roofs and turrets when they oxidize. Corrosion can be centuries away. No? I also believe that the climate we live in can have an effect on our comprehension and our experience with green coins.</p><p><br /></p><p><br /></p><p><br /></p><p>&quot;Copper surfaces form tough oxide-sulfate patina coatings that protect underlying copper surfaces and resist corrosion for a very long time.&quot;</p><p><a href="http://en.wikipedia.org/wiki/Copper_in_architecture" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Copper_in_architecture" rel="nofollow">http://en.wikipedia.org/wiki/Copper_in_architecture</a></p><p><br /></p><p>Some photos and link to natural green patina vs. corrosion (green or any colour)...</p><p><br /></p><p><a href="http://metaldetectingworld.com/cleaning_coin_p3_patina.shtml" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://metaldetectingworld.com/cleaning_coin_p3_patina.shtml" rel="nofollow">http://metaldetectingworld.com/cleaning_coin_p3_patina.shtml</a></p><p><br /></p><p><img src="http://www.omnicoin.com/coins/991731.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p><img src="http://static.myvimu.com/photo/92/40592_m.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /> </p><p><br /></p><p><img src="http://static.myvimu.com/photo/91/40591_m.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />[/QUOTE]</p><p><br /></p>

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