Topic: Uranium Glass? Jelly Fish ID help

[Roobarb]

Hello, this piece glows in the dark without a UV / Blacklight. So I'm not sure if that means it is or isn't uranium. I think it's meant to be a jelly fish. Any ideas are appreciated. Thank you!

[NevB]

Not uranium, possibly phosphorus or a mineral in the glass.

[Roobarb]

Thank you NevB. It also glows under blacklight, so at first I thought it was uranium for sure - then it kept glowing without!

[Ekimp]

That’s a bit different, is it hollow do you think? Do you have to ‘charge it up’ with light to make it glow in the dark or does it still glow in the dark if it’s been kept covered all day?

Possibly made with tritium that is used for luminous dials etc? https://en.wikipedia.org/wiki/Tritium Or radium https://en.wikipedia.org/wiki/Radium

Some glow in the dark jelly fish paperweights that maybe made of the same stuff:  https://www.sundevilserviceandsupply.com/4-glass-Jellyfish-Paperweight-Glow-in-the-dark-p/jellyred031.htm

[NevB]

Others online are said to contain phosphorus and need to be charged up in daylight. I hope it doesn't contain tritium or radium, that doesn't sound like a good idea, says the uranium glass collector 

[Lustrousstone]

They contain phosphors, not phosphorus. A phosphor is any chemical than can emit visible light after being charged by some sort of radiation or energy. They are how fluorescent lights work. And whatever they are using in these paperweights won't be anything radioactive

[Roobarb]

Thanks both Think it does need to be charged but going to double check. Guess it's the same as the plastic stick on ceiling stars that need charging with light. Never see it in glass