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<p>[QUOTE=&quot;desertgem, post: 3788653, member: 15199&quot;]It depends what you are protecting. Coins begin to tarnish at 2·6–16·6 torr ( mmHg) of water vapor, so coins are stored best between 0 and 3 mmHg water vapor. Many &#039;dry&#039; storage conditions do not need to be that low. Cobalt chloride used as an indicator is commonly used at higher levels. </p><p><br /></p><p>Paper contents such as currency, historical documents, etc. generally prefer about 40% moisture or they dry out and crumble over time. So if you have mixed goods, you might have to use a lot of ziplock bags and sacrificial zincolns for the coins. When they tarnish change the desiccator or recharge it.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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