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<p>[QUOTE=&quot;900fine, post: 983046, member: 6036&quot;]...From the original post on this thread, which indicates <b>the color spots are oxidized silver, not gold</b>.</p><p><br /></p><p>Can anyone <b>present for us Good Science <i>a la</i> the OP</b>, which&nbsp; shows chemical&nbsp; analysis of color on &quot;pure&quot; gold coins and reveals the&nbsp; color areas as ionic salts of gold ? I&#039;m not saying they don&#039;t exist.&nbsp; I&#039;m not saying anyone is &quot;wrong&quot;. I&#039;m just saying I am interested in seeing Good Science evidence.</p><p><br /></p><p>The point has been made many times; color on gold coins of high purity&nbsp; can come from two sources, namely impurities IN the gold and impurities&nbsp; ON the gold. That is the basis of this thread; the color is due to&nbsp; oxidized silver, not gold - even though the gold was &quot;pure&quot; (which, of&nbsp; course, it isn&#039;t. Never has been.)</p><p><br /></p><p>No one has demonstrated that color on a &quot;pure&quot; gold coin is from oxidized gold. Show me the science, <i>a la</i> the OP.[/QUOTE]</p><p><br /></p>

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