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<p>[QUOTE=&quot;mrbrklyn, post: 635705, member: 4381&quot;]We teach qualitation analysis in Chemistry with US Pennies and I&#039;ve not seen a brown gas.&nbsp; After putting it in acid you do a spectroanalysis and figure out the contents of the coin which is listed in the government registries.</p><p><br /></p><p>Ruben[/QUOTE]</p><p><br /></p>

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