Appraisers use them to detect forgeries of antiques.In the next section, we'll see what kinds of objects contain phosphors, and we'll look at some interesting uses for black lights. The external phosphors glow as long as the UV light is shining on them. In both of these light designs, the emitted UV light reacts with various external phosphors in exactly the same way as the UV light inside a fluorescent lamp reacts with the phosphor coating. It absorbs everything except the infrared and UV-A light (and a little bit of visible light).
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