Yeah. It's amazing how many different colors appear on the human body in the darkness with a blacklight. My wife and I did that two days ago. We found yellows, neon orange, purple and even green.
Dang, ok, let me try this again without "veiled profanity"
Human skin should show up as purplish under black light. If you have any... stuff... on you that shows up as orange, green or any luminous colour, you are perhaps dirty to the point of being disreputable.
A Blacklight in the bathroom would however cause urine to glow, which I believe was the point.
