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Handy banknote detector pen, portable and easy protection against counterfeit money, checks euros (including all new notes), US dollars, British pounds How it works: you can mark a note with the pen, preferably in a bright place on the edge of the banknote Result: real money - the line fades to a slightly yellowish colour and is hardly visible later. Counterfeit money - The line is very dark and very clearly visible Banknotes are made of special paper - the pen recognizes it by the composition of its ink, which then fades. Counterfeit money is often made of plain paper, the ink reacts and becomes dark