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<p>[QUOTE=&quot;Troodon, post: 1582807, member: 4626&quot;]Basically these pens contain iodine, that react with starch to produce a dark color.&nbsp; The idea in theory is real money doesn&#039;t have starch in the paper.&nbsp; Problem being you can get false positives from any starch-free paper, and false negatives if genuine currency gets any starch on it.</p><p><br /></p><p>You&#039;re much better of carefully examining the other security measures on the bills instead of relying on these pens.[/QUOTE]</p><p><br /></p>

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