Why do white things glow under a black light?
by 
slmcgaughey
ANSWERS: 1
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it's just a matter of reflected light. black lights work best when there is no other light source, and this is why: white objects reflect all colors of the light spectrum. most light sources emit all or most of the colors of the light spectrum. a black light only emits the blues/purples. white objects then reflect back the blue and purple, and what you see is that reflected light. it looks really cool, but only when there is no other light source and no other colors being reflected. when all colors of the light spectrum are blended, the result is white light.
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