Looks like that glow from Homer Simpson's stick)) This colorful and interesting experiment demonstrates the properties of substances to emit radiation, usually light, under the impact of an external source of energy, usually ultra-violet. From this experiment, you will find out about the luminescence of fluorescent (ultraviolet) dyes, which are used, for example, un the manufacture of banknotes, decorating rooms and nightclubs, while fluorescein itself is used to dye rivers green on St. Patrick’