Ultraviolet light turns ordinary white beads into a rainbow of colours.The sun’s ultraviolet rays are impossible to see with the naked eye, but with UV Colour Changing Beads, you can see the effects of ultraviolet light! Special pigments in the beads respond to ultraviolet light, making them change from seemingly ordinary white beads to six different colours. Make bracelets, test sunscreen, or even test sunglasses with these red, orange, yellow, green, blue and purple beads. These beads aren’t just fun and beautiful, but they’re also a great object lesson of the importance of sun safety. Approx 2500.