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<p>[QUOTE=&quot;Coinchemistry 2012, post: 2038556, member: 28107&quot;]The gold used in classic U.S. coins is only 90% gold and the remaining 10% consists of copper and other trace metals to include silver.&nbsp; It is this 10% that can cause gold to exhibit different colors, especially when the alloy is not evenly distributed throughout.&nbsp; I wouldn&#039;t say that one series is more prone to toning, but there are certain branch minted coins during different periods that produced high levels of silver and other trace metals than take on interesting colors as a result.&nbsp; </p><p><br /></p><p>Here is my contribution to the thread: another Saint.</p><p><br /></p><p><img src="http://i1126.photobucket.com/albums/l620/coinman23885/Collection%20-%20Core/Toners/90_rev_SC_zps975d4d68.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />[/QUOTE]</p><p><br /></p>

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