suzs replied to the topic Does Wissmach luminescent behave the same as iridescent? in the forum Glass Fusing 1 month, 3 weeks ago
Petra Kaiser has a lot of information out there on firing lumi. Temperature matters as well as lumi has to be fired face down on thin fire or papyros to keep the luminescent. If capped it will lose its luminescent. Can be slumped lumi side up as slumping temperatures are lower.