GENIE counterfeit banknote marker

The counterfeit banknote tester is a portable and easy protection against counterfeit money, checks euros (including all new banknotes), US dollars, British pounds.
How it works: you can mark a banknote with the pen, preferably in a light place along the edge of the banknote.
Result: genuine banknotes - the line fades to a slightly yellowish color and later becomes almost invisible.
Counterfeit banknotes - The line is very dark and very clearly visible.
Banknotes are made of special paper - the marker recognizes it by the composition of its ink, which then fades.
Counterfeit banknotes are often made of ordinary paper, the ink reacts and turns dark.