These Sharpie Counterfeit Detector Pens are specially formulated to detect bad bills
- Counterfeit money detector pens are specially formulated to detect bad bills.
- Golden-brown ink changes to blue-black when marked on a suspect, counterfeit bill.
- Technology used by counterfeit marker reacts to the presence of a key ingredient present in papers that are not used by the U.S. Treasury.
- Authentic bills marked by a counterfeit detector pen will not produce an ink color change.
- Comes with 3 counterfeit detector pens.