Ultraviolet-sensitive bead
Ultraviolet-sensitive beads (UV beads) are beads that are colorful 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 colorless and either translucent or opaque. However, when sunlight falls onto the beads, an instant color change occurs, turning them red, orange, yellow, blue, purple, or pink.
External links
This article is issued from Wikipedia - version of the 11/4/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.