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<p>[QUOTE=&quot;calcol, post: 2650977, member: 77639&quot;]Calcium sulfate is very safe.&nbsp; Chances are you&#039;re surrounded by it because it&#039;s the main ingredient in drywall.&nbsp; The calcium sulfate in drywall is already hydrated (it&#039;s gypsum).&nbsp; I don&#039;t recommend heating drywall to use as a desiccant.&nbsp; It has binders and organic materials that may decompose, and once heated, will be partially in the form of a fine, white powder that will drift through the air and settle on coins, people, etc.&nbsp; If you&#039;ve ever cut drywall, you know what I mean.</p><p><br /></p><p>Drierite (calcium sulfate) is still available with or without an indicator.&nbsp; It&#039;s in nodule form, but can also be a little dusty.&nbsp; If you use it, pour it into an open container or porous sack away from coins.&nbsp; Then, after the dust has settled, place the container or sack in proximity to the coins.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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