Opticz UV Blacklight Blue Invisible Ink- 16oz

This stuff is almost completely invisible going on and has a bright glow under a long black light. We used this at a show. At one point in the song all the lights went out except for the blacklights. So the stage went completely dark except for us: we were glowing. Apparently it's pretty safe for skin, too, because I haven't felt any negative consequences, yet.I'm not sure the effect would be so profound under blacklight LEDs which do not throw out as much UV rays.

Works ok

Just what we needed to provide training to staff.