Could we have thorium?
Properites:
THOR
Light blue powder with a glow effect.
Like POLO but needs plut to work.
When touching plut, it releases a modest amount of neutrons and slowly heats up to 250C.
After a pixel of thorium releases 25 neutrons it turns grey and stops emitting anything.
When it touches oxygen, it turns dark grey and goes to normal after 500 frames.
Turns into molten THOR at 1752C.
If lighted on fire in oxygen, it burns bright white.
Super good idea
love the idea