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Thread Owner
Many of the old antique childrens' marbles fluoresce under a blacklight (UV light). So will 1930s glassware such as green or yellow/green Depression Glass (uranium glass) and McKee Jadeite. You can buy a UV flashlight using LEDs instead of lightbulbs on the Web for about $25. Any place that people dumped trash during the 1930s has lots of fluorescent glass. Ny house,patio and yard are full of this glass that I've found at local dumps.