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<p>[QUOTE=&quot;TheNickelGuy, post: 1470513, member: 20201&quot;]I am commenting here to WARN those who might get any bright ideas about playing with chemicals and coins.</p><p>I watched that video up there ( POST #73 <a href="http://www.cointalk.com/t205352-2/#post1430862" class="internalLink ProxyLink" data-proxy-href="http://www.cointalk.com/t205352-2/#post1430862">http://www.cointalk.com/t205352-2/#post1430862</a> ) where the copper cent is disolved in acid and I really doubt that the guy had a respirator on. </p><p>Dumb as a bag of hammers if he didn&#039;t. That gas was pretty intense in the video. So I looked it up and as I suspected ...</p><p><br /></p><p>Copper is oxidized by concentrated nitric acid, HNO[SUB]3[/SUB], to produce Cu[SUP]2+[/SUP] ions; the nitric acid is reduced to nitrogen dioxide, </p><p>a :rollureyes: <b>poisonous</b> :rolling: brown gas with an irritating odor.</p><p><br /></p><p>and</p><p><br /></p><p><b>!!! Hazards !!!</b></p><p>Nitric acid is extremely corrosive. Handle with care.</p><p>The nitrogen dioxide produced in this reaction is poisonous. <i><b>This reaction must be done in a fume hood!</b></i></p><p><i><b><br /></b></i></p><p><i><b>Here is also a coin related article </b></i></p><p><i><b><font face="Courier"><font size="6"><font face="Courier"><font size="6"><font face="Courier"><font size="6"><font face="Courier"><font size="6"><br /></font></font></font></font></font></font></font></font></b></i></p><p style="text-align: left"><i><b><font face="Courier"><font size="6"><font face="Courier"><font size="6"><font face="Courier"><font size="6"><font face="Courier"><font size="6">A </p><p></font></font></font></font><p style="text-align: left"><font face="Courier"><font size="6"><font face="Courier"><font size="6">case of acute nitrogen dioxide poisoning</font></font></font></font></p><p></font></font></font></font></b></i>This is a link to a pdf file <a href="http://pmj.bmj.com/content/61/719/819.full.pdf" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://pmj.bmj.com/content/61/719/819.full.pdf" rel="nofollow">http://pmj.bmj.com/content/61/719/819.full.pdf</a> and it is specific about cleaning coins.[/QUOTE]</p><p><br /></p>

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