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These are invisible inks that fluoresce one colour when excited by long wave 365nm UV light and another shade when subjected to short wave 254nm UV light. It is also possible to make Bi-Fluorescent combinations using 313nm and infrared responses.
Banknotes, Passports, Tamper-Evident Labels, Product Authentication, Stock Certificates, Postage Stamps And Identity Cards, and other goverment and applicable sectors documents or products etc.