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UV Beads Change Color in Sunlight UV Beads change color when exposed to UV radiation (sunlight)  
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Don't use your skin as detector of ultra-violet light (UV), try experimenting with Energy Beads or UV Beads. These indicator beads change color when exposed to UV light. It's an amazing way to test the effectiveness of sun screen or to see if UV light is really blocked out by filters in sun glasses.

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