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<p>[QUOTE=&quot;Leadfoot, post: 1068160, member: 2972&quot;]Explain to me how a thin film grows to a particular thickness/color (e.g. blue) with other colors found much less often.&nbsp; Said a bit differently, why is blue so common?&nbsp; To me the answer is obvious -- it&#039;s not natural, and given than detergents have been proven to turn copper blue it seems even more so -- however, I am open to alternatives.&nbsp; </p><p><br /></p><p>Back to the topic at hand, Rick doesn&#039;t sell coins cheaply and his affinity for blue-toned copper is well-known, so I&#039;d guess $301.[/QUOTE]</p><p><br /></p>

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