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<p>[QUOTE=&quot;Neal, post: 3058324, member: 43872&quot;]Another poor indicator, not present on these bills, is the use of &quot;counterfeit detection&quot; pens.&nbsp; The ink mark left by the pen supposedly changes to a certain color if the bill is counterfeit.&nbsp; According to what I was told by the people at the Bureau of Engraving and Printing, the pens only react to the ph (acidity), which can be duplicated in counterfeit bills and changed through environmental factors in genuine bills.&nbsp; The Bureau does not recommend relying on the pens.[/QUOTE]</p><p><br /></p>

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