Color Changing Sun Sensitive UV Reactive Acrylic Mood Beads, Luminous, Glow in the Dark, Round, WhiteSize: about 16mm in diameter, hole: 3mm.â UV-sensitive beads contain a special pigment or dye that is sensitive to UV radiation. When the beads are exposed to strong sunlight or strong UV light sources such as blacklights or UV lamps, they undergo a chemical reaction that causes them to change color from white to purple. â Please Note: The beads must be placed under strong UV light or direct sunlight for the color change effect to be obvious. The longer the beads absorb light, the more permanent the color of the beads will be.
