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<p>[QUOTE=&quot;Insider, post: 4600888, member: 24314&quot;]You&#039;ll need to remind me to post images at a later date.</p><p><br /></p><p>No matter what the fineness is, &quot;copper-colored&quot; spots appear on gold straight from the Mint or they develop over time.&nbsp; The common explanation is they result from an impurity in the ally mix near the surface that reacts with the atmosphere.&nbsp; I don&#039;t know anything about them except for this:</p><p><br /></p><p>There are two basic types.&nbsp; A spot on the surface that comes off w/o a trace and a spot that is actually a reaction patch surrounding a tiny black chunk of debris struck into the coin.&nbsp; As you can see, purple and blue are also associated with the copper and reddish colors.[/QUOTE]</p><p><br /></p>

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