why does cat wee glow?

Question

a bright colour when a black light is shined on it?

Answer 1

“Black” or ultraviolet (UV) light is a type of light wave within a certain, fairly broad frequency range. Within that range, there is a specific light frequency that will cause urine to fluoresce as brightly as possible. Bio-Pro Research UV Black Lights are engineered to produce that specific wavelength of UV light, so they simply work better than normal store-bought black lights and make the task of locating urine deposits easier.

Any store-bought fluorescent “black light” will fluoresce dried urine to some degree – but the brightness will depend on the actual wavelength of the light output, and this varies considerably from light to light. Even among different lights of the same make and model, the manufacturing tolerances of consumer-grade black lights are simply not demanding enough to reliably produce a specific UV light wavelength. These lights are fine for their intended purpose, but for the specific job of detecting dried urine, they are less than ideal (note too that incandescent or screw-in household bulbs with “black light” coatings generally do NOT fluoresce urine at all).

Thus, the job is completed faster, easier and more thoroughly
with a Bio-Pro Research UV Black Light.

Answer 2

All urine, whether from cats or not, does this. In fact, many fluids from animal and human bodies glow under black light. It has to do with the proteins found in these fluids.

Answer 3

phosphorus

Answer 4

What is it that you are asking?