In this case, the urine stain will look like a line of paint dripped from box to box.įIND THE CENTER. Rodents also may sit on the edge of boxes or on pallets and urinate, with urine dripping down the sides that may also fluoresce, especially on cardboard and paper.Rodents like to move along walls when they travel, so they will leave grease stains that also may fluoresce.Human urine or a spill of some kind is the likely source of such splash patterns. Large patches that show a radiating pattern away from the main deposit are not usually caused by rodents. In heavily contaminated areas, urine deposits may form large patches that are surrounded by scattered smaller droplets of various sizes.However, since roof rats carry their tails up and off the ground, you will not see this drag pattern when roof rats are involved. Since Norway rats and mice drag their tails behind them, when they urinate, a smeared line may be noticed through the urine stain.Rodent urine typically is deposited as a series of droplets in a line, with the larger droplets first, trailing off to smaller and smaller droplets.Here’s an overview of how black lights can detect rodent presence: Since amino acids in urine will “glow” when exposed to UV light rays, black lights may be a useful tool for tracking these incontinent rodents. Mice will deposit anywhere from hundreds to thousands of micro droplets of urine per day. This means rats and mice urinate and defecate frequently, whenever and wherever the urge hits them. While this article deals with the use of UV light for rodent inspection, it may be interesting to know that this technique also is used by food processors and others to identify food quality defects and contamination, as well as some disease-causing organisms.īlack light becomes a useful tool for rodent detection because rats and mice are incontinent. When exposed to UV light, different substances will glow, or fluoresce, in colors specific to that substance. UV light is also sometimes referred to as black light. Ultraviolet (UV) rays are not visible to our eyes, but when they hit certain substances, UV light causes those substances to “glow,” or release energy in wavelengths we can see with our eyes. ![]() Examples of this kind of light would be X-rays, cosmic rays, radio waves and infrared waves, just to name a few. There are shorter and longer wavelengths that are not visible to our eyes. The human eye is only capable of seeing a small segment of the light spectrum. Light is a form of electromagnetic energy that moves in measurable waves.
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