Famous Black Light Flashlight Dangerous References. Web better safe than sorry. Web uv flashlights, or black lights, use ultraviolet radiation (uv) to illuminate objects or substances that would normally be invisible to the naked eye.
Use it to quickly identify areas of pet urine, spot scorpions in the dark or uncover a counterfeit bill. Web powerofforever / getty images you have probably seen black lights at amusement parks, science museums and halloween displays. Web there are various types of uv black lights.
