This is Alexial, my deathstalker scorpion, Leiurus quinquestriatus, when she was a young adult. This is what it looks like when you
combine a blacklight with the normal light in the room. All scorpions
glow under blacklights.
The following photo shows what she looks like in normal light, though in this photo she's all grown up:
You should NEVER leave a blacklight on a scorpion long-term. The intense UV rays will eventually kill the nocturnal animal. Some pet stores market scorpion habitats with blacklights because they look cool, but they don't tell you the facts.