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Update time : 2019-12-20 15:19:22
At bank notes and other securities printing they use fluorescentdyes, i.e., dyes capable to glow under exposure to UV-radiation. To give a dye such a property, they add special components into it - luminescent solids that do not glow in natural light, but under exposure to UV-radiation there appears luminescence of one or other colour called fluorescence.