Sure substances exhibit fluorescence, a phenomenon the place they take in ultraviolet (UV) radiation, also called black gentle, and re-emit it as seen gentle. This emitted gentle provides the looks of glowing. Frequent examples embrace tonic water, which accommodates quinine, and plenty of fluorescent dyes utilized in clothes and posters. The method entails the absorption of short-wavelength, high-energy UV gentle, adopted by the emission of longer-wavelength, lower-energy seen gentle.
The phenomenon has quite a few functions, starting from forensic science, the place it’s used to detect bodily fluids and hint proof, to creative expression by way of fluorescent artwork and theatrical results. Its use in security measures, corresponding to figuring out counterfeit forex, highlights its significance in defending in opposition to fraud. Traditionally, the invention and understanding of fluorescence have contributed considerably to advances in spectroscopy and supplies science.