Quality Park Sure N'Fast Counterfeit Detection Pen, Clear, 10 ml, 1 Pen (46060) 10 mL pen Works with many foreign currencies including Canadian Bills, Mexican Bills, Euro Dollars, and many others Detects counterfeit bills printed on genuine treasury paper, copy paper, newspaper, recycled paper, and many other types of paper. The patented formula detects bleached bills, and will not cause damage to authentic currency. Over 200 applications per bottle.