About:
Why do the beads change colour?
UV beads contain a chemical that is photochromic. This chemical changes colour when exposed to ultraviolet radiation. Normally they are colourless but when UV light strikes them the molecules become excited and the structure of the molecules change. This allows the beads to absorb visible light and the colour changes. When taken out of UV light the molecules go back to the original state and lose the colour. This can happen over and over but it is best to keep the beads out of UV light as much as possible.
Notes:
The orange beads have a very clear chnage.
Notes:
The purple beads change colour very quickly when exposed to sunlight. See if you can stop the video before the colour change is complete.
Notes:
The yellow beads seem to change colour very slowly.
Notes:
In this example there is a random selection of colours.