4 ms·
"Or radium (maybe a different radioactive) they use to paint on clock/watches to make them glow in the dark." You're thinking of tritium: http://en.wikipedia.
by patrickk 16y ago
"Or radium (maybe a different radioactive) they use to paint on clock/watches to make them glow in the dark."
You're thinking of tritium:
http://en.wikipedia.org/wiki/Tritium_illumination http://en.wikipedia.org/wiki/Tritium_illumination
- rgsteele 16y agoYeah, or radium: http://en.wikipedia.org/wiki/Radium_dials http://en.wikipedia.org/wiki/Radium_dials