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<p>[QUOTE=&quot;NPCoin, post: 494094, member: 5629&quot;]Actually, that very poisonous brown gas is not nitric oxide (nitrogen monoxide), it is nitrogen dioxide.&nbsp; Nitric oxide is produced in dilute nitric acid, along with copper nitrate and water, turning the solution blue.</p><p><br /></p><p>The CENT, however <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" />&nbsp;&nbsp; should be left with some kind of copper oxide layer if dipped &quot;properly&quot;, if there is such a way with nitric acid.&nbsp; I would assume if not rinsed immediately, that you would end up with either a clay red or black layer.&nbsp; If this could be avoided, there should be a good protective layer that should stop any corrosion, verdigris, or PCV damage that may have been on the cent.</p><p><br /></p><p>As far as cleaning is concerned, I would guess it would depend completely on what exactly you are trying to clean off and the reaction those substances would have with the acid.&nbsp; You could very well end up with an explosion if you have large enough traces of certain other substances.[/QUOTE]</p><p><br /></p>

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