3 Different Phosphors in Low Pressure Air

Same setup as last time, but this time with fewer leaks (evidenced by softer and larger purple cathode glow) and with three phosphors "deposited" (if you can even call it that) onto the glass. I just mixed them with 70% isopropanol and brushed them onto the inside of the tube in semicircles. The red positive column discharge is observed here possibly to a greater extent than it was with the last setup.

Up top is cool white halophosphate phosphor (taken from deceased F40T12), and this stuff was great to work with, made a nice even coating. It's glow is similar in color to a mercury starved fluorescent tube, which makes plenty of sense. I don't have a source of triphosphor right now but if I do I'll compare the two.

In the middle is zinc sulfide (glow in the dark powder). It's grain size was obviously a little large, as the coating looks like garbage. But it's really green! And of course it has a long afterglow once the power is removed, as is expected from a glow in the dark powder. This one was the brightest, and if I could get an even coating I think it would look very very nice.

On the bottom is some phosphor from an unfortunately deceased CRT, which used to illuminate a light sky blue (monochrome of course). This went on a little too thick so it's hard to see but it does fluoresce a nice light blue color, not too bright though. This is all just from UV exposure, not electron bombardment like it would have been inside a CRT.

This is all just put together with rubber stopper, no glassworking. But the other day I did try my first dumet seal with dumet wire taken from a neon indicator (pain in the neck to take the tin plating off of it) and it looks good. Also tried a tungsten+boro seal, but it turned out completely black unfortunately. Hopefully I am on the road to making something actually interesting lol!