The greenish glow in your clear glass (including paperweights) is caused by the presence of a manganese compound. This was very commonly used as a decolorising agent; clear glass often naturally has a greenish colour cast like Coke bottles. Other decolorising agents are generally used instead these days.
This yellowish green glow can be found with other glass colours, including green, so unless your green glow is really really bright green, you can't attribute it to uranium. Uranium always glows the same shade of bright green, no matter how little was used. The glowing just looks a little diluted.
This is the sort of glow uranium gives, your photos are excellent examples of the glow manganese gives in glass of any colour
Managanese is also what causes clear glass to develop that greyish or purplish tinge (or even a very bright purple tinge but not in the UK, not enough sun or UV rays). The ultraviolet light causes a chemical reaction that turns the manganese compound from a colourless one to a purple one,
Topic: Clear flint pressed glass glows green under uv light is it due to uranium help (Read 7665 times)
