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<p>[QUOTE=&quot;Ian, post: 25837, member: 283&quot;]I think one of us has a profound misunderstanding as to the cause and nature of&nbsp; verdigris. That IS verdigris on your coin and not some esoteric `disease&#039;.</p><p><br /></p><p>check out the full definition of verdigris here:</p><p><br /></p><p><a href="http://dictionary.reference.com/search?q=verdigris" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://dictionary.reference.com/search?q=verdigris" rel="nofollow">http://dictionary.reference.com/search?q=verdigris</a></p><p><br /></p><p>As an analogy, if you were to breathe in some mustard gas for a while the chances are very high that you would develop irreversible lung damage. That does not mean that you should thereafter be kept in an isolation ward&nbsp; just in case your `lung disease&#039; somehow became magically transmittable to others. Sure, others can get the exact same lung damage, but NOT through contact with someone who already has it.....only by exposure to the same (or similar) environmental pollutant. </p><p><br /></p><p>THAT (on a less dramatic scale) is the type of factor involved with the `verdigris&#039; on your coin. It&#039;s a chemical thing. it is an environmental thing explicable through basic chenmistry. No more. No less. </p><p><br /></p><p>You can start off with a problem free coin, but if you store it in an environment which has the relevant pollutants in it you will engender coorosion of the coin. Plain and simple. Verdigris doesn&#039;t magically `jump&#039; from coin to coin like some&nbsp; parasite in search of a new host or like a bacteria crawling over the side of one petri dish into another. For coins to develop verdigris they have to have come in direct and constant contact with a corrisive chemical. </p><p><br /></p><p>If you were to spray some coins with a fine mist of salt water, they wouldn&#039;t all necessarily show signs of corrosion at the same time. You might notice a spot on one coin.... then a week later spots appear on another coin...then another... etcetera. It may actually appear as if it&#039;s `spreading&#039; but it is not. They just react differently based upon their own particular chemical composition (and any trace material that may have been on the surface at the time). Iit takes time for the chemical reaction to show signs. </p><p><br /></p><p>If you find that other coins start developing verdigris, then whatever else it may be it sure isn&#039;t due to the `disease&#039; jumping over to them. It should however be an indicator to you as to the effectiveness (or lack of) of your storage methods. I can assure you that storing coins in trays does NOT (emphatically) lead to&nbsp; corrosion in any shape or form. Storing them in pvc flips (whether the plasticised or unplasticised type) and in the typical plasticised pvc coin sheets inevitably does. This is due to them being in direct and constant contact with known pollutants. Sure the effects are not immediate, but give it time......</p><p><br /></p><p>Hopefully the advice given by the professional you mention will prove sufficient for you. As they say in the UK `you pays your money, you takes your choice&#039;.&nbsp; ;-)[/QUOTE]</p><p><br /></p>

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