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<p>[QUOTE=&quot;desertgem, post: 1377807, member: 15199&quot;]For a balanced view on the subject of Cobalt Chloride (blue) vs. Methyl violet&nbsp; ( orange) indicators, read this from the National Park Service, it is more understandable than a MSDS unless you are use to those publications.</p><p><br /></p><p><a href="http://www.google.com/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=1&amp;ved=0CCIQFjAA&amp;url=http%3A%2F%2Fwww.nps.gov%2Fmuseum%2Fpublications%2Fconserveogram%2F02-15.pdf&amp;ei=X7pCT4KZIMeniQKfg82yAQ&amp;usg=AFQjCNHk5--ba6-RHFjmwrwHQKDQVI1hZQ&amp;sig2=J1alPse3RWlSm9aPlW2GiA" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.google.com/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=1&amp;ved=0CCIQFjAA&amp;url=http%3A%2F%2Fwww.nps.gov%2Fmuseum%2Fpublications%2Fconserveogram%2F02-15.pdf&amp;ei=X7pCT4KZIMeniQKfg82yAQ&amp;usg=AFQjCNHk5--ba6-RHFjmwrwHQKDQVI1hZQ&amp;sig2=J1alPse3RWlSm9aPlW2GiA" rel="nofollow">http://www.nps.gov%2Fmuseum%2Fpublications%2Fconserveogram%2F02-15.pdf</a></p><p><br /></p><p>The main difference , assuming you don&#039;t eat, grind,snuffle, or overheat the product, is mainly in disposal. yes, cobalt compounds disposed improperly do not readily break down, as they are inorganic substances whereas, the methyl orange indicator being organic does break down in the environment. Somewhat similar to the exotic batteries like lithium, cadmium, etc., containing units which are not generally dangerous in use, but in landfills, they can become so over time. Even some of my oil paints and pottery glazes have cadmium and other inorganics which must be delivered to the local hazardous waste area along with batteries and the fluorescent lights, and various electronic waste. I do not see any significant reason to dispose of Cobalt chloride silica devices ( which have been in use almost 60-70 years) for the Methyl Violet silica. If you are buying new stuff, your choice, but the better deal is to buy straight silica pellets and a <b>hygrometer</b>&nbsp; to measure the humidity and leave the indicators alone. IMO!.</p><p><br /></p><p>I do not have any interest in selling such, and I actually don&#039;t rely on it myself, so no dog in the fight, just a little chem background.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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