So I know very little about Tritium, but I’ve been thinking it would be nice to add a vile to my nightstand light. I always end up fumbling for my light and knocking it over when I’m trying to make a stealthy middle of the night bathroom trip. A single trit might help me out, so I’ve been looking at them. I understand Tritium is a isotope of hydrogen and I kinda know what that means, but I’m wondering what gives it different colors?
Tritium is normally not visible to the naked eye, but when it’s stored in vials coated with phosphor, it reacts, producing radioluminescence. I think the variations of phosphor coatings is what gives tritium vials/inserts its different colors.
Oh that makes sense, isn’t that how neon light tubes work? The trits do look a lot like neon colors.
Various preparations of the phosphor compound can be used to produce different colors of light. Some of the colors that have been manufactured in addition to the common phosphors are green, red, blue, yellow, purple, orange, and white.
Tritium illumination - Wikipedia, the free encyclopedia
Thanks 
The process by which Tritium produces different colors is identical to the process by with a Cathode Ray Tube (CRT) produces colors. Tritium emits a relatively low energy beta ray (an electron) when it decays, just like the electron gun on a CRT. When the electron slams into a phosphor molecule (the inside of the tritium filled tube is coated with a phosphor, just like the screen on a CRT), the phosphor glows whatever color the phosphor is. Phosphors are available in a wide range of colors, so pick one, and that is the color you will get from the Tritium.