I've been trying to find out where I got the idea that Willow Blue contained uranium. I know one of the members in the other forum (I noticed you're registered there, Christine) said that he had a Willow Blue piece that glowed really brightly, but then he showed a photo of one in UV and it didn't seem very bright at all. Maybe it was my imagination that I saw uranium in a Willow Blue formula. Actually, he's a member here; maybe I'll email him and get him to poke his nose in, he knows a lot about Cambridge.