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Krypton is the usual thought as it seems to relate to kryptonite which all Superman fans know glows green.

The noble gases fluoresce in different colours in gas discharge tubes. Helium is white to orange, neon is red-orange, argon violet to pale lavender-blue, krypton white to greenish, xenon whitish to blue green at high currents and radon is not specified. So the Superman fans are right!

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15y ago
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