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Glowing Petroleum Jelly

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Petroleum jelly, such as Vaseline, glows bright blue under a black light.

Petroleum jelly, such as Vaseline, glows bright blue under a black light. Anything you paint with the petroleum jelly will glow blue under ultraviolet light.

Anne Helmenstine
This image was produced by drawing a smiley face with Vaseline onto a white cutting board and turning on a black light.

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