Bought some artistic fluorescent glass, pink Europium doped, and some blue. Unfortunately, it is not very bright in shortwave UV from xenon. It reacts much stronger to UV-A from a flaslight - see cool lightpipe effects. Still some fun. As this glass comes in sticks, not tubes, I tried my best to make some 'pumpable' bubbles. That tube was a real bitch to pump, anyway, because art glass comes with many small air bubbles, and it was really hard to find all leaks.