To that tall guy in my CHEM3203 lab, Your hair is yellowish brown, Your eyes are blue, You seemed a bit frazzled, But I am rooting for you.Quinine, the chemical that gives tonic water (for wine as well) It's bitter flavor. Quinine is a fluorescence. Which means it can be excited by UV ray to give a pretty blue colour in the visible range. --in my option, the most interesting thing in quantum part of chem.