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<p>[QUOTE=&quot;desertgem, post: 1513563, member: 15199&quot;]Corrosion isn&#039;t usually a single cause unless induced in a lab, so environmental conditions must be considered. The foci of the corrosive action must also be considered. Gaseous agents ( including some paper envelopes)tend to produce thin films ( flat) more related to colored toning--&gt; corrosion. Whereas &quot;bulk&quot; foci such as &quot;sneeze, saliva, perspiration, drops of chemicals, pvc plasticizers , etc. tend to cause more rounded granular corrosion, but they both end up like that if the corrosive process goes far enough. </p><p><br /></p><p>Not to be gross or insensitive,but body secretions of sulfur compounds from foods consumed have effects sometimes. If someone&#039;s breath, or sweat smells strongly of onions, garlic, cabbage, turnips, etc., they are exuding sulfur compounds. Sulfur is high in hair and nail content as well as skin cells, so a thin eyelash, sneeze mucus, or saliva falling on the coin surface, or probably one of the more common sources, Dandruff, can initiate a almost invisible corrosion loci if sealed inside a 2x2 .&nbsp; A coin might move from one collector to another, being exposed to corrosive agents&nbsp; that are different in each situation. There are chemical reactivities of metals that would have to be considered too.[/QUOTE]</p><p><br /></p>

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