Why do bodily fluids such as saliva or sperm glow under a black light? and why not (to the best of my knowledge) sweat?
Why do bodily fluids expose themself under ultra violet light?
hmmm
i'm guessing that some proteins are photoreactive - i'm sure somone in the physics section could enlighten you more on that one.
as for sweat - it's just a mixture of water, salt and urea, so there is no protein in it.
incidentaly - you need special uv lights for protein, not just any old light, i used one at the hospital - it's amazing how many stains i have on my hands that i can't see!
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