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<p>[QUOTE=&quot;Kentucky, post: 2566097, member: 33176&quot;]Eh...none of these are good and are to be avoided.&nbsp; The dosage of each of these necessary for death is HCN&gt;H2S&gt;CO however the amount of H2S released by dipping a coin is miniscule. </p><p><br /></p><p>I actually managed to get a mild case of HCN poisoning once when, as an undergraduate, we were running a reaction from which it could be produced.&nbsp; I surmise this from the fact that when I stepped out into the hallway to have a smoke, it made me somewhat nauseous which is one of the first signs of HCN poisoning (sensitivity to nicotine).&nbsp; I know several students in the lab that did get pretty sick that night.</p><p><br /></p><p>Want to read more... <a href="https://groups.google.com/forum/#!topic/sci.chem/he5_H_2HPpM" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://groups.google.com/forum/#!topic/sci.chem/he5_H_2HPpM" rel="nofollow">https://groups.google.com/forum/#!topic/sci.chem/he5_H_2HPpM</a>[/QUOTE]</p><p><br /></p>

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