[new-Jedi]

what is uv light? i am a new comer,so there is too many things that i don't know.

No it's fine, I'm no expert myself. Umm, it's a black light.

Kalpa marks their bottles with a anti-counterfeit luminescent film that can only be seen under a black light.

Ever been to a rave? It's those light that make white glow like purple, etc.

If you had one you could make sure it had the markings.