Beads change color, temporarily, from white to blue, purple, or red when illuminated by UV light. Use with UV flashlight, or direct sunlight.

See physics here: http://www.arborsci.com/uv-beads-package-of-1000

Flashlight emits UV light, of wavelength 385nm. Contains filter to block white light. Use also on minerals, florescent dyes, scorpions, etc.

• Located in L01, section C-1.