Procedure and apparatus for making documents secure consists of applying two different substances that produce luminescent radiation in response to excitation

摘要

#CMT# #/CMT# The procedure, for use with banknotes or other documents (10), consists of applying a security sign (100) using two different substances with pigments that generate luminscent radiation at different spectral frequencies in response to excitation radiation (210) centred around a wavelength of about 370 nm. The first substance generates luminescent radiation with a broad frequency range, while the second one emits one or more rays outside the spectrum of the first. The emitted radiation (220, 221, 222) can be detected by a machine or the naked eye. #CMT#USE : #/CMT# Making documents or banknotes more secure. #CMT#ADVANTAGE : #/CMT# The system is gives added security and makes documents more difficult to counterfeit. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows two versions of banknotes using the added security system. 10 : Banknotes 100 : Security signs 210 : Excitation radiation 220, 221, 222 : Emitted radiation.