Amazing Science Kits: Ultraviolet Beads. Explore solar energy with these color-changing beads! Just expose them to sunlight and watch! Make two cool bracelets and show all your friends. This package contains thirty ultraviolet beads, two cords for bracelets, and an instruction sheet. Recommended for ages 8 and up. WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 years. This set contains chemicals that may be harmful if misused. Adult supervision required.