Electromagnetic waves located at the lower end of the visible light spectrum. They move within the wavelength range of 200‒400 nm. Abbreviation for ultraviolet. More light is often used to analyse security documents and notes and security features such as See Banknote paper. More brightness, fluorescent inks, fluorescent A banknote security feature incorporated randomly during the manufacture of the paper. The fibres can be made of silk, plastic or metal, and may be visible, invisible, or fluorescent under UV light. More, etc. UV-lamps used in stores and banks to verify banknotes operate at a wavelength of 365 nm.