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<p>[QUOTE=&quot;MrSpud, post: 106321, member: 4621&quot;]Just Carl, I&#039;m glad to hear that your coins have aged well over the years, you must be doing something right. At least right for you. However, many aren&#039;t so fortunate. Here are a few excerpts and links to show you what I mean.</p><p><br /></p><p>From <a href="http://www.pocketchangelottery.com/article96.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.pocketchangelottery.com/article96.htm" rel="nofollow">http://www.pocketchangelottery.com/article96.htm</a> </p><p>&quot;According to Susan Maltby, vulnerable metal coins will </p><p>start to corrode when the relative humidity in the </p><p>surrounding air rises above 35 percent. Obviously, then, the </p><p>risk of corrosion is higher in a damp, humid place such as </p><p>Florida than it is in a drier climate -- the kind found in </p><p>Arizona, for example.</p><p>To combat this risk, you need to create what Sue Maltby </p><p>calls a proper &quot;micro-climate&quot; -- a neutral, acid-free </p><p>climate -- for your coins.&quot; </p><p>&quot;Silver is quite resistant to corrosion, but it&#039;s highly </p><p>susceptible to tarnish, especially in the presence of sulfur </p><p>compounds and nitrates. And Bern Nagengast points out that </p><p>sulfur and nitrate compounds are frequent components of air </p><p>pollution today, so these are real concerns. </p><p>&quot;Copper coins are especially susceptible to damage from </p><p>airborne particulate matter, and can break out in spots </p><p>virtually without notice. For this reason, you should take </p><p>special pains not to store copper coins in a moist </p><p>environment.&quot; </p><p><br /></p><p>From <a href="http://www.pcgs.com/articles/article1947.chtml" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.pcgs.com/articles/article1947.chtml" rel="nofollow">http://www.pcgs.com/articles/article1947.chtml</a></p><p>&quot;At times, the safe deposit box itself may contribute to coins&#039; deterioration. Ironically, this risk is likely to be greater in high-rent districts - banks where the box rental fee is higher than usual because special efforts are made to enhance the environment in the vault. Typically, this &quot;enhancement&quot; takes the form of increasing the humidity of the air. Banks do this because mortgages, wills, and other paper documents - the kinds of items generally found in safe deposit boxes - tend to grow brittle when the air is dry. But moisture is a coin&#039;s enemy: water serves as a catalyst for chemical reactions on coins&#039; surfaces. Therefore, it is advisable to store your coins in a bank where the vault is not moisturized - and normally, that will be a bank with cheaper box rates.&quot;[/QUOTE]</p><p><br /></p>

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