Tonic Water Glows

Tonic water glows blue. Ask students to predict what will happen. Illuminate both in dim area. Key idea: Quinine absorbs UV and re-emits visible blue light almost immediately. Ask: Why does the glow stop when the UV light stops? Safety and cleanup: UV light kept away from eyes; no drinking demo liquids. https://www.google.com/search?q=%22Tonic+Water+Glows%22+science+demonstration+experiment