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<p>[QUOTE=&quot;Marsyas Mike, post: 3639082, member: 85693&quot;]Interesting observation, Kevin.&nbsp; It seems from time to time I come across something about how a certain patina originates from a certain kind of soil or moisture conditions.&nbsp; Calgary Coins has a useful guide to patinas, although I don&#039;t see the reddish type.&nbsp; It does state:</p><p><br /></p><p>&quot;Copper oxide comes in various colors but mostly reds, browns and blacks, and it is very common for an ancient bronze coin to have a mix of these colors across the surface...&quot;</p><p><a href="http://www.calgarycoin.com/reference/grading/patina.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.calgarycoin.com/reference/grading/patina.htm" rel="nofollow">http://www.calgarycoin.com/reference/grading/patina.htm</a></p><p><br /></p><p>Here is a photo of all four sestertii I got from the same buyer - they look very similar to me in terms of patina - that Marcus Aurelius has the largest area of the reddish stuff, creeping up over his nose and on Jupiter&#039;s throne.&nbsp; It&#039;d be great to know if these did indeed come from the same hoard or the same soil conditions, but this information is usually lacking, unfortunately. </p><p><br /></p><p>[ATTACH=full]976812[/ATTACH][/QUOTE]</p><p><br /></p>

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