Security recognition for paper money consists of security band or thread on note printed with invisible code and with fluorescent dye containing rare substance whose afterglow last milliseconds after stimulation of dye

摘要

The security band or security thread for the security proofing of paper money is printed with a code which is not visible to the naked eye. A fluorescent colored dye is put or printed on the band or thread. The dye contains a rare substance or a lanthanide. The persistent glow time when the dye is stimulated is in the area of milliseconds.