Counterfeit detection pens use a starch-iodine reaction. We fool them using chemistry!

So the pen detects that it's genuine currency, but cannot detect that it's not a $100 bill. That's what happened to at least two South Street businesses over the weekend, Rex 1516 and The Jet Wine ...

And when Rudnick used a counterfeit-detector pen on the $100 bill the woman paid with, the ink stayed clear — the mark of a genuine bill.

Swipe Dri Mark’s counterfeit detection pen on a phony $20 bill and the ink comes out black, like a permanent marker. If it’s real money, the ink is gold and fades over time. The specialty ink ...

The most recent counterfeit bill passed a test from a counterfeit detector pen – a pen with color-changing ink that helps detect counterfeits.Officials urge Sharonville business owners to pay ...

Counterfeit detector pens also are available at many office supply stores, police say. If you purchase a product or register for an account through a link on our site, we may receive compensation.

In over 20 years as a trooper, I never saw them get around the counterfeit detector pens like this before," said state Trooper Stephen Limani. Limani said one bill was passed this week at Sally ...

A corrections officer used a counterfeit detector pen to check the currency Herring had and determined one of his $20 bills he had when arrested was counterfeit. Police seized the bill as evidence.

Lake also says in addition to the counterfeit detection pen, they use ultraviolet light to check notes and have a counterfeit bill detector machine as well. The Delray Beach Police Department ...

WASHINGTON, Jan. 29, 2024 — Counterfeit detector pens use a starch-iodine reaction to identify fake bills. But could you fool them with chemistry? In today’s episode, we dive into the chemistry of ...