What Kind of Invisible Stains Do Black Lights Detect?

Black lights make fluorescers glow, like the posters of the 1960s. Fluorescers naturally occur in some biological fluids, but they also occur in vitamins, laundry detergents and soda water containing quinine.

This Powerful Flashlight- Is just what you need to detect bed bugs in a hotel room or find invisible stains from Body Fluids. Black light Is Ideal For

Powerful LED Ultraviolet Black light Flashlight, Detects Bed Bugs, Insects, Scorpions, Diamonds, Automotive Leaks, Pet Stains, Toxic Mold. Great for

AloneFire SV005 UV Flashlight 365nm Ultra Violets Ultraviolet Invisible USB Torch Black Light Pet Urine Stains Detector Scorpion

SUPERTAC-395 Military Grade UV Black Light flashlight with Batteries

Simple Solution Spot Spotter HD UV Urine Detector

Lepro Black Light Flashlight Small UV Lights 395nm 9 LEDS Portable Ultraviolet Light Detector for Invisible Ink Pens, Dog Cat Pet Urine Stain, AAA Batteries Included