Pen-Size Counterfeit Currency Bill Detector Marker

Features include a cap-off design, plastic barrel, and pocket clip. The special ink is specifically formulated to work on US dollar bills and major international paper currencies. When marked on real currency, it will produce a clear or light yellow mark, while on counterfeit bills it will turn a dark charcoal black. The marking will fade after a few hours. This product is sold blank, without any decoration. 5.25" L