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<p>[QUOTE=&quot;Coinchemistry 2012, post: 2210542, member: 28107&quot;]Urea, thiourea, pyridine, and certain other nitrogen compounds and acids can produce a false positive on the Beilstein Test.&nbsp; What I meant by &quot;false positive&quot; in my initial response was that assuming Doug&#039;s point was with merit (which I disagree with him), his argument would cause him to conclude that it is oversensitive and would give false positives.&nbsp; A negative result would be useful adopting his logic.&nbsp; I wouldn&#039;t expect to find any of the compounds above in coin flips anyway (unless you spilled coin dip on them), and if all contaminants properly removed, would suggest the presence of a non-fluorine halogen.[/QUOTE]</p><p><br /></p>

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