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<p>[QUOTE=&quot;theSharpGun, post: 1815349, member: 39683&quot;]They are called copper spots which is sort of a misnomer. Many say that these spots will develop on a coin that is part copper and part gold, and it is because of the copper that these spots will develop but that is not true. Even .999 fine gold can develop these spots over time. This is because&nbsp; .999 fine gold leaves a .001 for the impurities that cause chemical reactions which eventually lead to red spots developing over time. For example the presence of Silver (Ag) and Sulfur (S) even in small amounts on a gold coin can cause these spots over time. The same case is true for gold coins of other levels of purity. </p><p>The Intercept Shield won&#039;t stop this chemical process because by the time these gold coins have arrived to the Intercept Shield they have already been exposed to elements that cause red spots. And I don&#039;t mean just the environmental factors. In many cases many gold coins are already infused with elements that cause red spots. This is of course the .1% out of the 99.9% pure gold coin or any other number of mixtures with gold that leaves the chance for impurities to affect gold coins. At least that is my understanding.[/QUOTE]</p><p><br /></p>

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