Take so time to get used to the Danish accent. It’s very worthwhile. Checkout the explanation behind fluoresence: exited states of electrons. Also radium glass (where to get it these days?) tonic water and even washing detergenet are lighted with UV (ultra violet) light. Lovely results.
Light: Fluorescence, tonic, radium glass and other cool stuff
Posted in 4. Waves, Vibrations, Sound, Light