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(Don't mistake the reflection of visible purple light from the UV lamp for Pb fluorescence.

Pb normally fluoresces more strongly than manganese or antimony. High-lead glasses are usually colorless. The fluorescence becomes noticeable at a level of about 5%, and is strong by about 10-15%. The fluorescence is visible under both long-wave and short-wave UV. Pb (Lead) - A strong icy-blue response, but not normally as strong as U. Ancient glasses contain at most a few ppm of U - not nearly enough to cause any UV fluorescence.

The color is usually obtained by adding ~0.5 % U2O3. Once you have seen the color, you will remember it. You can tell a uranium-containing glass just by looking at it. The color of the glass itself in visible light is usually a bright yellow or yellowish-green, or an amber color in a lead matrix. U (Uranium)- A very strong bright-green response. Leaving out the exotic elements not found in ordinary glasses, the responses are more-or-less as follows: The fluorescent response depends on several factors: primarily the elements present, sometimes matrix effects, the concentrations, the wavelength of the exciting radiation, the intensity of the exciting radiation, possibly the redox  state of the elements, colorants that might be present, etc. There are several elements that will cause common glasses to fluoresce. Robert Brill, Research Scientist Emeritus: 17 Lampworking/Flameworking/Scientific GlassblowingĮxample of uranium glass.4 Glass Labor History/Working Conditions.