Ultraviolet-sensitive bead
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Ultraviolet-sensitive beads were developed to react to ultraviolet rays, which are present in light from the Sun and various artificial sources. When UV beads are not exposed to ultraviolet rays, they are colourless and either transluscent or opaque. However, when sunlight falls onto the beads, an instant colour change occurs, sending them red, orange, yellow, blue, or purple. The purpose of this colour change is to alert the wearer of ultraviolet radiation around them, which has potentially dangerous effects on a person's health. The beads are water-fast and functionality is not decreased by time.
