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<p>[QUOTE=&quot;BadThad, post: 2338983, member: 17261&quot;]The moisture is already there, it&#039;s part of nearly everything. You&#039;re breathing it in right now. It doesn&#039;t matter how well you have your coins &quot;sealed&quot;, there is already air (thus moisture) trapped inside.</p><p><br /></p><p>Fluctuating temperature is the WORST possible thing for coins. Open your mind a little, there are processes at work that you cannot perceive. On a electrochemical scale, all metals have internal currents constantly flowing, there is also micro-level humidity. These micro-currents/humidity are always changing with the environment. As metal cools, more micro-condensation is formed on the surface, i.e. a thicker molecular layer. As this layer interacts with the current, you get corrosion. As temperature fluctuates, this drives the process even more and eventually you&#039;ll have corrosion you can see.[/QUOTE]</p><p><br /></p>

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