There is a chemical in the shell of all Scorpions will undergo fluorescence in ultraviolet light.

Emperor Scorpion with camera flash:

The next 2 are under long wavelength UV light:

Camera used was an Olympus C-2100.
Exposures were around 1 second, took many shots to get some with no movement.

Babies don't glow (taken with a Nikon 990):

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