 I mean, you're talking about clothes. The familiar thing for me is when you go into a disco, long time since I've done that, and the UV lights are going. Oh, yes, and your gin and tonic fluoresces. Or your white shirt. Yes, it's the same. It is the same thing. So it's the same kind of principle. So your fluorescent gin and tonic has quinine in it, which is a molecule which takes UV light and re-emits it, and that's why it's glowing in the disco.