According to our research scientist, Dr. Robert Brill,
A weak-moderate yellowish-green fluorescence (under either short-wave or long-wave UV) usually indicates the presence of additive manganese as a decolorizer. It is a common response by non-lead glasses of all types of many periods. I do not recall ever seeing a green fluorescence response to any lead glasses. The fluorescence of any other elements would normally be masked by the strong ice-blue fluorescence of the lead.
