This is a portion of my collection of marbles from the 1950s, gathered from various sources including my grandfather and uncles. They show their age, with air bubbles and scratches on the surface. When illuminated with a 100-yen store light, they fluoresce yellow or blue, but I can't definitively say they are uranium glass. However, I also collect vintage uranium glass bottles from before and after the war, so I suspect these are uranium glass as well. I'd love to pass them on to someone who collects them, or perhaps you're just curious about how they change color under a light. Or, how about using one for a science project to analyze its composition? Thank you. m(__)m