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<p>[QUOTE=&quot;yakpoo, post: 1091629, member: 18157&quot;]Since gold is the most inert member of the nobel metals, I think it&#039;s highly unlikely (although, not impossible) that a chemical reaction produced the &quot;tone&quot;. I&#039;ve read about older (90%) gold coins producing spots or a redish hue, but that was generally attributed to the copper content of the alloy. </p><p>&nbsp;</p><p>I&#039;m not sure how &quot;common&quot; spotting is on .9999 gold coins. I&#039;ve bought quite a few (for me, anyway) from the Mint since 2006 and haven&#039;t seen a spot, yet. However, Condor&#039;s suggestion of some external adherant changing color seems very plausible. An NCS cleaning sounds like good advice. ...I also like GeoreM&#039;s suggestion of a picture post :thumb: </p><p>&nbsp;</p><p>As to whether or not the toning (spotting) adds value to the coin, I think it depends on...</p><p>&nbsp;</p><p>1. Is the redish spot natural to the composition of the coin? and</p><p>2. Is the coin more or less attractive with the spot?[/QUOTE]</p><p><br /></p>

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