MMF Industries 200045110 Counterfeit Currency Detector Pen MMF200045110 MMF 200045110, The quick and simple way to prevent fraud by detecting counterfeit currency. Ink works to react with the starch in wood-based counterfeit paper to leave a dark mark and expose false currency. Just mark a small line on bill and observe results: Amber indicates a genuine bill, while black/dark brown means bill is suspect. Features naturally-occurring, long-lasting antimicrobial technology, which protects against the growt of bacteria on the surface of the pen. For best results, replace cap immediately after use. Counterfeit Bill Detector Type: Pen; Marking Color: Amber; Counterfeit Indication Mark: Black/Brown; Currency: U.S., UPC 078541167063