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<p>[QUOTE=&quot;Derick, post: 1641095, member: 39142&quot;]You mix vitamin C with dry calcium sulfate (gypsum) in a sealed container. Calcium sulfate (or commercial drierite) acts to dry air and Vit C scavange O2 from air to form water that is turn absorbed by the calcium sulfate. Chem 101. You can recycle it by drying in oven at 180 degrees C for 2 hours. Commercial drierite even change from blue to pink when saturated. Put it in the bottom of flat container about 10% of total volume. Put something over it like a cloth, paper or carton. Put coins on top. Close lid. Below are some pics. I took it step further measuring the oxygen and humidity levels just to make sure it works.</p><p><br /></p><p>[ATTACH]236348.vB[/ATTACH][ATTACH]236347.vB[/ATTACH][/QUOTE]</p><p><br /></p>

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