Fluorescence and Glow in the dark
UV and what it can do.
Some materials will glow in the dark.
There are a couple of mechanisms, one is caused by radioactivity, I do not play with that one. One is caused by chemistry, fireflies and snap lights. Fluorescence is something else. Ultraviolet light which is further into the blue spectrum than blue can cause materials to glow . It excites the atoms and then then they re-emit light at a different colour, almost a light echo but not quite.
This is a dish made of vaselein, Czech or otherwise known as Uranium Glass. Not very radioactive (honest) but it glows when you shine UV at it.
Tonic water and fluorsceine dye with uv laser.