While semen will fluoresce, so do many other bodily fluids. Substances such as sweat, urine, and saliva will glow under UV light. Using a UV light for semen detection is a starting point—not proof of its presence. Vitamins A and B, niacin, riboflavin and thiamine all shine under black lights. Blood, semen and urine contain florescent molecules, which make them visible under black light.

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Click to see full answer. Hereof, what bodily fluids are visible under black light? Biological Fluids 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.

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