@farmerman,
Thank you for that info! Actually, I already checked out which minerals fluoresce. If I recall correctly, willemite seems to have the best fluorescent properties. However, knowing that wasn't much help. What I really need to know is whether there is a fluorescent paint made of this substance.
I read an interesting article on UV light and fluorescence recently and decided to carry out a few experiments of my own-not that I'm a scientist or anything. But, I thought it would be interesting to coat a piece of card or something with the above mentioned paint and see how many UV light sources I could find around the house.
By the way, you mentioned detergent; does this contain zinc sulfide?