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====Applications====
: [[Ultra-violet]] can cause [[electron]]s in the [[atom]]s of [[fluorescent]] [[molecule]]s to gain [[energy]]. When the [[electron]]s lose this [[energy]] they [[emit]] [[Visible Light|visible light]]. This can be used to reveal [[fluorescent]] ink to detect forged bank notes
: [[Ultra-violet]] causes damage to the skin by breaking [[Chemical Bond|chemical bonds]] so in an effort to protect itself the skin produces [[melanin]], a brown pigment. This causes the skin to become tanned. This is used in tanning beds.
: [[Ultra-violet]] can destroy [[micro-organism]]s in [[water]] by breaking [[Chemical Bond|chemical bonds]] in those [[micro-organism]]s, so can be used to sterilise water.
====Dangers====
: [[Ultra-violet]] can cause sunburn and skin cancer by ionising and damaging [[DNA]] [[molecule]]s in the skin [[Cell (Biology)|cells]] leading to a [[mutation]].
: [[Ultra-violet]] can cause [[cataractcataracts]]s as it damages the [[transparent]] protective layer on the [[eye]]s called the [[cornea]].