[triplesec]

This stuff's been around a while. I remmeber a decade back, a happy friendly idiosyncratic engineer in a warehouse in SF I know very well, who showed me gleefully all the objects he had cvered in Europium powder. The glow was a little underwhelming, but it was interesting.

also, being concerned about possible toxicity, not really knowing my lanthanide chemistry, I did keep my distance, however.