I tested it and it definitely isnt Tritium! But my primary reason wasnt the glow at night but rather a different color for the front sight during day time. After endless reading about every ones rods and cones being slightly different, it is a cheaper experiment than fiber optic. Some people recognize green quicker, some orange, some yellow. I do find that my eyes locate the front sight quicker. Thursday I am off duty so I will be going to the range to see how it shoots. Next I will black out the rear with something temporary to see how my sight acquisition reacts, black tape probably. I wonder how the blue sight paint on the rear would work. It isnt black, but definitely darker than white. Always learning.