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<p>[QUOTE=&quot;Kasia, post: 1815405, member: 31533&quot;]Ok.... I&#039;m going to jump right in and put out some theory, based on my near-total non-knowledge of chemistry and metallurgy, etc., but only from reading a few things on the web and trying to make some sense with that and a result that gold coins &quot;red&quot; spot (not other colors) after leaving the mint, that they sometimes will turn blue later, and that if you reverse the red spot professionally (by means of really harsh nasty chemicals you don&#039;t want to fool with as an amateur) you not only reverse it but it doesn&#039;t come back. Hmmmmm.... To me that means that there is some impurity on or in the coin that is reacting to an environment different from that when it left the mint. And that the something that is reacting was in the minting or the processing/preparation of the alloy or the gold itself.......And that this impurity is not a regular metal that is just mixed in with the alloy to keep the gold from being too soft to hold a shape. (Longwinded, but.......) I am thinking this is something that is could be a remnant from the smelting process for the gold and or from the mint in &#039;cleaning&#039; up either it&#039;s gold planchets, strips, or in the mint for other purposes of cleaning or preparation of dies, etc. Since the problem of red spot gets worse with humidity and intercept doesn&#039;t seem to protect (my take on a quick reading of the Lucent technology on this ---- but spent nearly nil amount of time trying to weigh my thoughts and conclusions of this, since I don&#039;t have a background sufficient to do so properly ---- so I could totally be wrong) against corrosion of anhydrous particulates, like calcium chloride, that it might be unintended anhydrous particulates that have not been removed sufficiently from the hardening alloy or the smelted gold as it was prepared or something along that line, and that it is actually corrosion of a &#039;salt&#039; particulate or the like that you are seeing.&nbsp; But it doesn&#039;t seem that calcium chloride particulates should be in the mix ever... However, anhydrous Borax is used, apparently in some sort of process, I think..... So ---- long story short, I think it is anhydrous particulates not supposed to be in the alloy but which are not cleaned enough from use to not remain that either embed on the coin&#039;s surface or is embedded in the coin alloy. And that it takes the presence of both oxygen and water content in the air (i.e., humidity) to trigger the process of corrosion. I don&#039;t think that gold is toning, but it is a foreign particulate that is corroding that you see with &#039;red spot&#039;. And Intercept is not going to vacuum out oxygen from around a coin nor is it going to dehumidify that oxygen/atmosphere to the point of having the particulates remain anhydrous (without moisture).</p><p><br /></p><p>Ok.... now either trash this totally and tell me why, or say what could and could not be with my theory. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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