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<p>[QUOTE=&quot;BadThad, post: 1519604, member: 17261&quot;]Allow me to give you one example. H2S is typically in air between 0.11 and 0.33 ppb, and can be much higher depending on several factors. H2S is extremely corrosive to metal and, over time, can completely cover the surface of a silver coin with sulfides which will eventually cause it to turn black. Using your logic of allowing air to get to the coin surface, eventually a coin would be completely ruined.</p><p><br /></p><p>Reference: <a href="http://www.atsdr.cdc.gov/toxguides/toxguide-114.pdf" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.atsdr.cdc.gov/toxguides/toxguide-114.pdf" rel="nofollow">http://www.atsdr.cdc.gov/toxguides/toxguide-114.pdf</a>[/QUOTE]</p><p><br /></p>

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