Will UV piercings only glow under blacklight?

Answer 1

UV reactive is perfect for the clubs, as they glow vibrantly under black lights!

Blacklight is another term for an ultra-violet (uv) light.
To the eye, the light they emit seems to be an intense electric purple that doesn't really brighten anything normal unless it's white.
When used in low light on anything uv-responsive, the effect is astounding. Colours become suddenly intensely rich and vibrant and hover above the surface, sometimes appearing to hang in mid-air.