Does any one know where someone could obtain some phosphors for experimenting with, I was looking for some zinc sulphide activated with copper and aluminum ( green ) ever since seeing a homemade ion lamp with a cold cathode..
It can be be seen on this Polish website
https://www.elektroda.pl/rtvforum/topic2171020.html?l=en And does anyone know how pure welding neon and argon gas is ?