Yellow Uranium Glass Ball

In the past, glass manufacturers added uranium to glass for color. Uranium has since become more strictly regulated, but the old uranium glass objects are still floating around. Because of the uranium content, these marbles glow bright green under ultraviolet light. 

Each ball measures approximately 7/8-1” in diameter. Some dents and manufacturing imperfections can be expected. Slightly radioactive, but they’re harmless. This makes a great sample of uranium if you’re collecting the elements.