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<p>[QUOTE=&quot;Kentucky, post: 2651037, member: 33176&quot;]OK, it is a good idea to protect coins from moisture (and from oxygen...but that&#039;s a different story) and desiccants seem to be a good way to do it.&nbsp; Calcium sulfate is a good desiccant, with or without cobalt chloride indicator.&nbsp; In graduate school we often used magnesium sulfate, which I think is a faster agent.&nbsp; Both of these desiccants suffer from then problem of dusting.&nbsp; Agents which have much less chance of being problematic include silica gel and one people haven&#039;t mentioned, molecular sieves.&nbsp; Either of these should present less dusting problems.&nbsp; The inclusion of cobalt chloride in some form should not be a problem, as long as you don&#039;t eat it.&nbsp; I know cobalt chloride test strips have been common in many labs I have worked in, and AFAIK, cheap.&nbsp; Buy a tube and you have perhaps a hundred reusable test strips.&nbsp; They are activated by &quot;roasting&quot; over a flame till they turn blue and indicate moisture by turning pink.&nbsp; [USER=17261]@BadThad[/USER] might have something to add too.[/QUOTE]</p><p><br /></p>

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