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<p>[QUOTE=&quot;desertgem, post: 1377908, member: 15199&quot;]Most of the chemical objections to the cobalt chloride ( and I do respect the environment ) is improper disposal when someone is finished with them. Used properly, and not pried open for curiosity, sniffed, baked at 450 with cookies, etc. Just common sense, both will serve their purpose as humidity indicators and removing water vapor. More coin damage is done by the owner not noticing results, and regenerating the silica. As medoraman mentioned, a sacrifical coin is an excellent indicator, as it indicates a chemical problem. Since I store paper money in my safe, and I want some humidity for that not to be damaged, I use bright new post 1982 cents, scrubed to brightness , such as with a brillo pad, in the safe. Fresh copper with the patina removed is also a great reactant with sulfur or other chemicals in the air. If one turns RB-ish , it is replaced. Some of you will recognize this as the underlying mechanism for Intercept(tm) products.</p><p><br /></p><p>By the way, if you worry about either silica paks, take a hole punch and punch several holes in a ziplock bag and put the silica pack in that. Any leakage of silica or indicator particles will be in the bottomn of the bag when you remove to recharge. Always dispose of the bag when the zipper dies in a proper hazardous waste container. IMO.[/QUOTE]</p><p><br /></p>

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