You may know that sometimes stains can be removed from a carpet using laundry detergent. However, without further testing, there's no way to know whether the glow is semen just from looking at it. Because of its chemical makeup, semen will shine brighter than most bodily fluids. Blood will show up black unless the area is first treated with luminol. Blood or Semenīlood and semen are typically what crime scene investigators look for when they canvas a room with a black light. Pretty gross, right? Although, this is a great way to show younger children the importance of covering your nose and mouth when you sneeze. That's right if you sneeze and then turn on a black light, you can see just how far the sneeze's particles traveled. When you sneeze, saliva and mucus are forced out. Let's consider what happens when you sneeze. Crime scene investigators will use black lights to help locate any DNA evidence they may be able to use in a case. These are some of the examples you might have seen during a show such as CSI. Bodily Fluidsīodily fluids such as urine, sweat, saliva, semen, and blood will show up under a blacklight directed toward the carpet. They contain a substance that will absorb and remit the light.Ĭlick here to see a blacklight on Amazon. This is why some things will glow under the blacklight and others won't. Once absorbed, they reemit the light making it appear to glow. Ultraviolet light falls between visible light and X-rays on the electromagnetic spectrum. They come in a range of shapes and sizes, from handheld to wall mounts. Black lights, also known as UV lights, emit ultraviolet light. To understand why some things can be seen under a blacklight and why others cannot, you must first understand what a black light is and how it works. Additionally, we'll go over whether germs, mold, and fungus can be detected using a black light. We will also answer some other questions you might have about black lights and what they might reveal on your carpet. Now you know what you can see under a black light, but keep reading as we further discuss each item. We've researched the topic in-depth and have the answer for you. who knows which detergent was used blah blah blah etc.If you've seen the crime shows where they scan the room with a black light to look for evidence a suspect might have left behind, you may be wondering what else a black light can show on the carpet. So Im guessing some spot remover residue/damage may fluorese under the black light. Some brighteners can cause allergic reactions when in contact with skin, depending on the individual Optical brighteners have replaced bluing which was formerly used to produce the same effect. Also, various carpet manufacturers have expressed serious concern about yellowing of optical brighteners over time.īrighteners are commonly added to laundry detergents to replace whitening agents removed during washing and to make the clothes appear cleaner. Each spot, after drying, may appear lighter than the surrounding carpet, looking like color loss. Be careful in using any product which contains them as a spotter. They show up in sunlight or fluorescent lighting in particular. Optical Brighteners are fluorescent dyes (chemical ingredients) that appear fluoresce blue/white under ultraviolet light and tend to make light colors appear brighter. You have reduced the level of stain and odor to the point it is no loonger detectable by most humans. It takes very little of the salt from urine decomposition (and also proteins) to create a visible flouorescence. If that water then dries by evaporation (fans, air movers, etc.) the soil that was in the water is left behind. It still holds some of that contamination. Whatever water is left behind is not pure water. If you can remove 80% of the water by extraction (which I would consider a very good goal), then you have removed 80% of the contamination. Whatever urine and other contamination has been loosened from the carpet fibers in dispersed throughout the volume of water that was used. When soil must be dissolved, emulsified or suspended in the water. I know CRI testting says some equipment removes over 90% of soils, but that includes a lot of dry soil. Modern equipment likely does a lot better than the equipment tested in the 1980s. Vacuuming increased the percentage of dry soil removal but not the percentage of other types of soil that were removed. I have not reread his book recently.) The 48% removal was considered excellent. A few decades ago, Dr Eric Brown's research showed that different cleaning methods removed anywhere form 20% to 48% of the soil in the carpet. The fact is that cleaning carpet never removes 100% of everything. Maybe this will be answer #9 on your list.
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