The premium quality of color copiers and commercial printers today allows even less professional counterfeiters to produce deceptively realistic banknotes. Excellent copies can be made on regular paper that are hardly distinguishable from the original. Banknotes are made from special paper that the pen recognizes through the composition of its ink, causing the ink to fade. Counterfeit money often consists of regular paper, where the ink reacts and darkens. The GENIE Quicktester provides simple and portable protection: you mark a banknote with the pen, preferably at a light spot on the edge of the note. Wait a moment: REAL MONEY: The mark fades to a slightly yellowish color and is hardly visible later. COUNTERFEIT MONEY: The mark is very dark and clearly visible. Suitable for currency: EUR, USD, GBP, CHF. Round tip. Barrel color: blue/yellow. 10 pcs/pack.