Counterfeit banknote detection pen: Difference between revisions

Revision as of 08:34, 20 October 2022

Revision as of 09:26, 23 January 2023

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[[File:An_example_of_a_Counterfeit_banknote_detection_pen,_13_October_2022.jpg|thumb|A Counterfeit banknote detection pen, used to detect fake banknotes.]]

A '''counterfeit banknote detection pen''' is a pen used to apply an [[iodine]]-based ink to [[banknote]]s in an attempt to determine their authenticity. The ink reacts with starch in wood-based paper to create a black or blue mark but the paper in a real bill contains no starch, so the pen mark remains unchanged.

==Background==