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<p>[QUOTE=&quot;treylxapi47, post: 2269205, member: 41863&quot;]An add on for this. </p><p><br /></p><p>Put your coins in food grade ziplocks to create another barrier and then use the pennies as a litmus test. If you see them corroding you know you have a problem and the ziplocks will protect your coins from those same gasses for a time to address that issue. </p><p><br /></p><p>Sort of like a canary in a coal mine. The pennies are your canary.[/QUOTE]</p><p><br /></p>

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