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<p>[QUOTE=&quot;brg5658, post: 4798446, member: 29751&quot;]OK Doug, sure.&nbsp; Just to remind you....</p><p><b><u><br /></u></b></p><p><b><u>Direct quotes:</u></b></p><p><br /></p><p><span style="color: #0059b3"><u>CoinTalk member</u></span>: &quot;Does oxygen always have to be part of the mix in order for a coin to tone?&quot;</p><p><br /></p><p>[USER=112]@GDJMSP[/USER] : &quot;In simple terms, yes&quot;</p><p><br /></p><p><b><b>--------------------</b></b></p><p><b><b><br /></b></b></p><p>While oxidation of copper surfaces is indeed &quot;corrosion&quot; by definition - copper collectors should rest easy because when copper oxidizes it creates a <i>protective barrier </i>on the surface to prevent further oxidation.&nbsp; Thus, brown evenly toned copper is a much safer and much more stable type of copper to collect.&nbsp; </p><p><br /></p><p>I&#039;ve always said collecting RED copper is a foolish thing <i>long term</i> - eventually <i>all </i>copper will turn brown.&nbsp; The benefit of purchasing a copper coin after it has already oxidized is that you know it will not likely have unsightly, uneven blotchy toning.&nbsp; This instability of copper&#039;s red color is the very reason the TPGs stopped guaranteeing the color designations of copper coins.</p><p><br /></p><p>This thread needs more pictures:</p><p><br /></p><p><img src="http://brgphoto.com/images/photo11/1852_Large_Cent_NGC_MS65BN_composite.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /> </p><p>[/QUOTE]</p><p><br /></p>

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