Natural Phosphors

[old_tv_nut]

I forgot to mention that they have a recorded narration that is synced with the display:

Sequence is visible light, shortwave UV, longwave UV, both, then all lights off, which shows several seconds of phosphorescence in the lower right rock, fading before your eyes. They do it fairly quickly, so I had to rerun it about 10 times to get all the shots including some rejects. I thought someone might complain I was overdoing it.

Plus, it now strikes me that they must have UV filters in the glass case, to prevent you from seeing the usual violet haze when strong UV is present (and of course to protect you from shortwave UV, which is dangerous) - makes the colors especially clear.