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<p>[QUOTE=&quot;Oldhoopster, post: 2650868, member: 84179&quot;]I have used this material in my safe without any problems.&nbsp; One trade name is Drierite.&nbsp; The product is 98%+ Calcium Sulfate (the part that attracts the moisture) and &lt;2% Cobalt Dichloride.&nbsp; As others have said, Cobalt Dichloride is the indicator, it turns pink when as the Calcium Sulfate picks up moisture.&nbsp; When it turns pink, just toss it in the oven at a low temp to drive off the moisture.&nbsp; Once the moisture is gone and the Calcium sulfate can once again pull moisture from the atmosphere, the indicator turns blue. </p><p><br /></p><p><br /></p><p>Sulfates and chlorides are things that shouldn’t come on contact with coins, but by keeping the drierite in a separate container, I haven’t had a problem.&nbsp; Disclaimer: I currently use the silica gel packs.&nbsp; I don’t have any more Drierite and the gel is cheap.&nbsp; Theoretically, you should be able to recharge the silica gel, but it is difficult to determine when it is no longer absorbent, or if you recharged it for the right period of time.</p><p><br /></p><p><br /></p><p>NOTE:&nbsp; All of the safety information is available on the SDS.&nbsp; Google Drierite to see it.[/QUOTE]</p><p><br /></p>

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