Ultraviolet Bead

lt;div class="long-description"><h2>Description</h2>School Specialty UV Beads change color when exposed to ultra violet radiation from the sun. Opaque and white pony beads measures 6 mm x 9 mm and sold as 150 per pack.</div><div class="feature-description"><h2>Features</h2></div><div class="in-box-description"></div>

Light Levels Northern States Conservation Center

20g/pack 8mm Round Ball Ultraviolet Sun Color Changing Loose Spacer Beads for DIY Necklace Bracelet Jewelry Accessories

Changes color when exposed to sunlight, even on cloudy and rainy days, The more UV ray, the darker it will be. When the light go out watch these beads

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UV beads reveal the benefit of sunscreen

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Domini-Scientists Explore Nature - St. Mary's Dominican High School

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Watch white beads change to purple when taken outside the building! When returned they turn back to white. What causes the change? Humidity?

UV Beads, Change to Purple