Think positive for me!(pics in last post on 1st page)

[tarchon]

I haven't checked. Now, do I know someone with a blacklight?

I've got about every kind of light short of a synchrotron. I'll take that one I got at J's wedding and see what it does. My guess is that it won't phosphoresce, but I'll bet a blacklight will get something out of it.
Looks good

 

[tarchon]

Well, whatever crystal that guy in Virginia grows in his glaze, it's only very weakly fluorescent. Supposedly manganese strongly increases the optical emission of zinc silicate phosphors (if you wanted to try to get that), but probably the other stuff in the glaze is pretty effective at killing it. Fe, Co, and Ni are supposed to quench zinc/manganese phosphors. My Va pot has a blue-to-green glaze, so it may be chock ful of cobalt.