This item is not glow in the dark, they contain uranium which reacts to UV light (shown here under 395nm). Background radiation is around 20cpm to give you an idea of how weak it is, they are perfectly safe.
Uranium Vaseline Glass Yellow Cullet Chunk Piece UV Reactive - SUPERSIZE
Uranium Vaseline Glass Block 50x50 mm Uranium Yellow Glass Statue Art Deco
Uranium Vaseline Glass 14mm Yellow UV Reactive Marbles Marble (Seconds)
Uranium Vaseline Glass 12mm Yellow UV Reactive Marbles Marble (Seconds)
Uranium Vaseline Glass 10mm Green Yellow UV Reactive Marbles Marble
Vintage BOYD Uranium Vaseline Unicorn Yellow Opalescent Glass Mint Condition !!
