Watch white beads change to purple when taken outside the building! When returned they turn back to white. What causes the change? Humidity? Temperature? Fresh air? Birds flying overhead? The beads contain pigments which react with ultraviolet light from the sun, even on a cloudy day. They also change with most classroom UV light sources. Students can make their own UV light detecting bracelet by stringing the beads on a pipe stem or on a strip of rawhide. Great for teaching UV awareness! Use the beads to test the UV blocking effectiveness of sunblock, sunglasses, windows, etc. Lesson activities are included. The ultraviolet beads will cycle back and forth (to purple and back again) over 50,000 times! Approximately 250 beads per package. All of our UV beads are the same size. Approximate bead dimensions:
diameter 8.5 mm (5/16") - center hole 3.6 mm (9/64")
Uv Beads, Change To Purple
This product is shipped from our supplier's warehouse in CT, United States
This product is brand new and includes the manufacturer's warranty, so you can buy with confidence.
A 25% handling charge is levied against all authorized returns except those due to our error. Unauthorized returns are subject to a 40% handling charge. Damages & defects must be reported to us within 14 days.
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