For some time, I have stayed out of discussions on what causes a UV reaction in glass ... it's all quite complicated ... and far too difficult for me to put into simple words - even if I knew what I was mumbling about. :cry:
But, suddenly, my "pedant hat" dropped of the hat rack and plopped neatly onto my head as I approached the computer this evening ... so I would just like to say, in response to:
the pinchwork does not glow under UV as it's just clear glass
... Clear glass can give a UV reaction, and very often it's green. The fact that the clear pinchwork does not show a UV reaction merely means that it contains nothing in the proportions that would cause a reaction. I have seen some pieces with clear parts for the foot and rim or body decoration which react differently, showing no reaction for one part but green for the other :!:
And no, folks, I won't be drawn into the old debates about "uranium glass". No. Defintely not. No way. Too much for me. No more.