Unfortunately, urine stains aren't always obvious, especially on dark carpets -- and you can't remove what you can't find. But later on someone said semen stains cannot glow without a substance called 'luminol'. I've been told that they would glow in greenish-yellow under the UV light. Does that actually mean that the sheets are dirty or would that show up even after a good washing? You know how on some shows they show people shining blacklights on the sheets of hotels and you see semen stains and whatnot? they all say they cleaned and scrubbed but the smell is still there. Does Sperm Show Up Under Black Light After Washing. Materials that glow under Black Light from About.Com Chemistry. Yes, a black light will show stains, such as on a carpet or shirt. The Checkmate Group says black lights can even detect art forgeries: “Modern paint will fluoresce or glow under a black light (while) older paints will not. Unfortunately, the only easy way to tell the difference between a urine stain and a soda pop, milk or beer stain is to use a sniff test. Fun with Black Light for Home Chemists from Popular Science, July 1939. Edit: So, just because we see something under ultra-violet light, it doesn't mean that actual semen is there. Look at any other questions posted on here about pet urine stains. A black light looks dark purple, but most of the light it emits is in the ultraviolet (UV) range of the spectrum, which is invisible to the human eye. While dog pee glows under this type of light, so will liquids and other liquid-like substances, such as some laundry detergents, milk, honey, canola or olive oil, ketchup, tonic water, and antifreeze. Dozens and dozens and dozens of small areas illuminated, hundreds maybe! 14 List Of Chemicals That Glow Under Black Light - Application There so many other interesting application or product or creature that can produce light under black light condition. So that may be what's behind the stove/under the cabinets. Even a small urine stain on the carpet encourages your dog to continuously re-mark that spot.

Boric acid is one of the main ingredients in roach and ant poisons. Dr. Eric Lee — who is a medical director of several nursing homes, works in the ER, and is a medical expert for InvigorMedical.com — tells Hunker, "I would not use a blacklight to search for bacteria, because black lights do not disclose the presence of bacteria. I do not believe that it is in the best interests of a person to 'search for bacteria.' Although the reason for it is self-explanatory, there might be more to the story than meets the eyes. Hi all, Can anyone tell me if semen stains would definitely glow under a black light (UV light) ? So I bought a black light tonight, called "Stink-Finder." Note that the first link says that boric acid glows. So with this, it should pull the stain out so well that you won't see it under a black light. i would assume it would clean urine stains so that they would not be able to show up under a black light afterward.