I thought about the question of black light.
There is not black light. Black is what you get when there is no light, or no light is reflected. It can absorb light, but that's it.
A "black light" that people can buy is actually ultraviolet light. It's emits electromagnetic radiation, so most of it isn't visible. The only visible bits are the near ultraviolent range, so that's why if you put white next to a "black light" the white will look purple.
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