Bruecke-Abney phenomenon

The human eye is only able to distinguish three colors at low light levels: blue-violet, green, and red (the inability to distinguish colors other than blue-violet, green, and red at low light levels). – Even banknotes that are cleverly designed in terms of color can therefore be difficult to recognize in semi-dark lighting, as is the case in certain bars and restaurants, and counterfeits can be put into circulation all the more easily. – Empirical evidence shows that counterfeiters, especially in dim discotheques, night-clubs and bars, exchange high-value counterfeit banknotes for genuine banknotes or coins when exchanging money and doing business with guests. – Meanwhile, in such establishments, euronotes given in payment (banknotes issued by the ECB) are almost regularly illuminated with a small light in order to find the security strip embedded in the paper; and by lightly rubbing them with the index finger and thumb, it is possible to determine whether the security strip has only been glued on. To date, no cases have come to light in which it has been possible to embed the security strip in the paper as is the case with genuine euro notes. – See banknote management, banknote value restriction, counterfeit card, money, evil, counterfeit money, window money, guilloche skimming.

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University Professor Dr. Gerhard Merk, Dipl.rer.pol., Dipl.rer.oec.
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