I've got a weird question for you guys, /sci/: What are some materials that emit fluorescence below 400nm, ideally between 300nm and 400nm? I'm looking for a material that, when appropriately lit, will fluoresce in a way that I can't see with my naked eyes (but my full-spectrum camera may). Google isn't much help because most permutations in phrasing give me results heavily polluted with general UV lamp fluorescence meme shit (muh glowin' rocks woahoahohwoah). Pic somewhat related.