![]() ![]() When you think about it, there are dozens of situations where you could put this phenomenon to work. Most of these uses, as well as dozens of others, follow a common theme - the black lights make the invisible visible or isolate one specific substance from everything around it. Black lights can also identify semen and other bodily fluids that naturally fluoresce. ![]() This makes it easier to pick the fingerprints out from surrounding dirt. To pick out fingerprints, for example, they often dust with fluorescent dye under a black light. Forensic scientists use them to analyze crime scenes.Amusement parks and clubs use them to identify invisible fluorescent hand stamps for readmission.The United States and many other countries include an invisible fluorescent strip in their larger bills that only shows up under a black light. Law enforcement officers can use them to identify counterfeit money. ![]() Black lights can be used to detect counterfeit bills. For example, they might detect an invisible air conditioner leak by adding fluorescent dye to the refrigerant.
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