6/21/2023 0 Comments Uv black light![]() ![]() Blood, saliva, semen, and urine all glow under black light. Forensics – Crime scene investigators use a black light to hunt for evidence that would be otherwise invisible.Additionally, most gemstones are fluorescent, making them easier to spot under black light. Geologists take advantage of this by sometimes prospecting for fluorescent minerals, such as scheelite at night, using a black light. Geology – Most rocks and minerals glow with an array of bright beautiful colors under black light.In structural analysis, fluorescing liquids are painted over structures, then, using a black light, cracks and weaknesses in the materials are quickly and easily located. Engineering – In engineering, a black light can be used to quickly identify leaks in air conditioning systems and refrigerators.Meanwhile, an unusual amount of fluorescence can be a mark of counterfeit notes-as authentic paper that is used to print banknotes doesn’t glow under black light the way commercial paper might, because the chemicals used to process the paper differ. Similarly, many countries use banknotes that are marked with an invisible stamp that glows under black light. Stolen items may be marked with invisible ink that only shows up under black light. Authentication – Black light is used often for authenticating pieces of art and currency. ![]() Neonatal jaundice is usually treated with phototherapy, using blue light within a range of 420–470 nm. For example, some dermatological diseases can be detected through fluorescence that appears under black light.
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