The same holds for many organic substances, and most bodily fluids—including sweat, saliva, and urine—will shine when you put them under an ultraviolet “black light.” Criminal investigators use black lights to detect semen because they’re portable and easy to use.
Does Luminol detect sperm?
Black lights or UV lights are used by crime scene investigators to identify body fluids – including semen, sweat, saliva and urine. Semen happens to glow the brightest because of its particular mix of chemicals.
What do black lights detect?
Beneath a black light, blood turns black, unless sprayed with luminol which gives it a blue-glow. Saliva, semen and urine also glow when hit with a black light. Most biological fluids contain fluorescent molecules to help them glow.
Does female discharge show up under a blacklight?
Semen shows up with a black light, but discharge from a woman’s vagina can may also show up. In the descriptive literature there are varying examples of the color of stains under UV lights, however this is not linked to particular wavelengths or circumstances.
Does sperm show under UV light?
While semen will fluoresce, so do many other bodily fluids. Substances such as sweat, urine, and saliva will glow under UV light. Likewise, some cosmetics, oils, foods, cleaning products, even pet stains will emit a glow. Using a UV light for semen detection is a starting point—not proof of its presence.
Photo in the article by “Flickr”