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<p>[QUOTE=&quot;Just Carl, post: 117357, member: 4552&quot;]Slabbed coins are not necessarily air tight and the grading organizations do not claim that they are. Any air seaping into a slab contains moisture and numerous other contaminates that effect metals. Although Gold is considered a very non reactive metal, it still does react with other elements. For instance if there is a high consentration of Sulfur in the air in your area due to Sulfur rich coal being burned, the air will accumulate the SO or SO2 radicals which combine with the Hydrogen Hydroxide ( water)&nbsp; to form an air born acid. This acid does over a period of time react with Ag (Gold) to form Au2S a rather BR/BK color. If you have a pool nearby that contains Cl (Chlorine), some of the Cl becomes air born and also could effect your gold coins by becoming dark spots of AuCl4. However, such reactions would be very noticable on any Silver coins in the area first since Ag (Silver) is much more reactive than Gold. </p><p>The summation is to put such a slab into a freezer type plastic bag, squeeze out as much air as possible and seal. </p><p>If none of the above helps, just get rid of the coin by sending to me free. I&#039;ll put up with a few spots.[/QUOTE]</p><p><br /></p>

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