Expose them to sunlight and they immediately change from clear to colored. Cover them up and within minutes they are clear again. The UV Beads contain
UV Beads, Change to Orange, Ultraviolet: Educational Innovations, Inc.
Uv Color Changing Beads
UV Beads, Change to Purple, Ultraviolet: Educational Innovations, Inc.
Uv Color Changing Beads
8mm UV Color Changing Magic Beads UV Beads Round Rainbow Beads Change Color 2mm Hole Color Changing Beads 100 Pcs
Miscellaneous Avogadro's Lab Supply
UV Color Changing Beads - 250 Beads Assorted Colors
8mm UV Color Changing Magic Beads UV Beads Round Rainbow Beads Change Color 2mm Hole Color Changing Beads 100 Pcs
500 Pcs Luminous Pony Beads Glow in The Dark
Magical UV Beads Combination: 1500 pieces translucent-color glow in the dark beads, there are rose, orange, yellow, fuchsia, blue, indigo and violet.
Korlon 1500 Pcs UV Beads, Glow in The Dark Beads Color Changing Sun Sensitive UV Reactive Pony Beads, Plastic Solar Beads with Crystal Elastic String