I just got a really nice email from Josh at Superior Threads. Josh send me a link with more information on why certain threads glow while using your black light. Also!!! Also a list of which threads will glow!! Awesome!!! Check it out here. I can't wait to try some of these other threads!
Mean time, the two I use the most are Magnifico #2198 Citrus Flash
I only had one light plugged in when I took the next picture so it's not as bright as normal...
The other, which is my favorite, is Rainbow #841 Neons.
These two colors work perfectly together!!!