Why does it make everything glow without making the room brighter??
In: Physics
It’s mostly near-ultraviolet light, and we live in a world where a lot of things are impregnated with dye designed to absorb those frequencies and output visible light. In particular these dyes make white things look brighter and whiter, so paper, a lot of plastic products, and so on all “glow” (more accurately fluoresce) under blacklight. Some more natural things do the same, such as urine, semen, and some other bodily fluids. For that reason blacklights can be used to search out pet urine stains for treatment.
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