Ultraviolet-sensitive bead
From Wikipedia, the free encyclopedia
Ultraviolet-sensitive beads (UV beads) are beads that change color in the presence of ultraviolet radiation. Ultraviolet rays are present in sunlight and light from various artificial sources, and can cause sunburn or skin cancer. The color change alerts the wearer to the presence of the radiation.
When the beads are not exposed to ultraviolet rays, they are colourless and either translucent or opaque. However, when sunlight falls onto the beads, an instant colour change occurs, turning them red, orange, yellow, blue, purple, or pink.
The beads are water-fast and functionality is not decreased by time.
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