Beyond violet is a dangerous type of radiation called ultra violet. You can remember it's dangerous by the expression "ultra violent"! The lamp below emits mainly UV. Some violet light is also emitted, and this is picked up by the camera:
UV is also emited from the Sun. It is to this that our bodies respond when out in the sunshine for too long. A brown pigment is produced in the skin to help protect our living cells from destruction - or even cancer. UV is partly absorbed by the ozone layer, but it is still important to apply sunscreen as an extra layer of protection.
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