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Counterfeit banknote detection pen : ウィキペディア英語版 | Counterfeit banknote detection pen A counterfeit banknote detection pen is a device used to apply an iodine-based ink to banknotes in an attempt to determine their authenticity. The U.S. Government states "counterfeit detection pens are not always accurate and may give you false results, which is why we recommend relying on security features such as the watermark and security thread."〔(Resources for the Retail Industry; newmoney.gov )〕 ==Background== Counterfeit banknote detection pens are used to detect counterfeit Swiss franc, euro and United States banknotes amongst others. Typically, genuine banknotes are printed on paper based on cotton fibers, and do not contain the starches that are reactive with iodine. When the pen is used to mark genuine bills, the mark is yellowish or colourless. Counterfeit pens are most effective against notes printed on standard printer or photocopier paper.〔(【引用サイトリンク】title=How does a counterfeit detector pen work? 123 )〕 The chemical properties of US banknotes prior to 1960 are such that marking pens do not work.〔(【引用サイトリンク】title= OLD PAPER MONEY AND COUNTERFEIT-DETECTING PENS )〕
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