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==Efficiency==
Pen manufacturers claim such pens will detect a great majority of counterfeit bills, easy to detect method which does not require expensive gadgets {{Citation needed|date=May 2013}} but critics suggest the effectiveness is much lower. Critics claim that professional counterfeiters use starch-free paper, making the pen unable to detect the majority of counterfeit money in circulation.<ref>{{cite web
|url= http://www.sciam.com/article.cfm?id=0001547E-EECE-1FD3-A7EA83414B7F012C
|title= Bunkum!
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