To make paper currency they use mixed dyes of special composition. Only a spectrum analysis of dye (which is done in some specific, specially selected spectrum ranges) permits to precisely define colours ratio parameters and to detect a counterfeit bank note printed by a counterfeit dye.
Discover how the DC-5100 UV/MG banknote detector spots counterfeit cash in under a second. CE-certified, multi-currency, built for banks, retailers and cash offices.
