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A type of plastic used in packaging for tamper resistant seals appears to have (what I can best describe as) a purplish inner glow under sunlight, and perhaps other bright light. In the image below, the glow is present but much more blue (rather, less purple) than it appears to the naked eye. What is this effect? (Scintillation, something else?) Why does it happen?

plastic glow

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Luminesce is the most probable answer. It is absorbing uv and radiating purple/blue.

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