Cats’ Urine

You can use a black light to detect body fluids. It is actually a good way to look for pet urine or make sure a bathroom or hotel room is really clean. Cat urine, in particular, glows very brightly under ultraviolet light.

Urine glows under a black light primarily because it contains the element phosphorus. Phosphorus glows yellowish green in the presence of oxygen, with or without black light, but the light imparts additional energy that make the chemiluminescence eaCats Urinesier to see. Urine also contains broken down blood proteins that glow under a black light.

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