In this episode we hear of Robert and Joseph Switzer, brothers who invented fluorescent paints as college students in the 1930s, and parlayed it into an internationally famous business over the next few decades, till fluorescent paints and pigments became popular in the 1960s. The second half of the episode discusses the discovery of fluorescence and  how itworks, and we learn of the difference between fluorescence and phosphorescence.Support the show Support my podcast at https://www.patreon.com/thehistoryofchemistry Tell me how your life relates to chemistry! E-mail me at steve@historyofchem.com Get my book, O Mg! How Chemistry Came to Be, from World Scientific Publishing, https://www.worldscientific.com/worldscibooks/10.1142/12670#t=aboutBook