Semen Sperm Detection UV LED Flashlight - Light sperm uv
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Semen won't give off light like a glow-in-the-dark sticker, but it does fluoresce. In other words, it absorbs ultraviolet light and re-emits that energy. Does semen really glow in the dark? We've all seen the crime shows that have investigators wandering around a dark room with a UV, or “black light”, looking.