How do things glow in the dark?

Toilet paperYou see glow-in-the-dark things in all kinds of places, but it is most prevalent in toys. In the dark they will glow for 10 minutes. Usually it is a soft green light, and it is not really that bright. You need to be in almost complete darkness to notice it.

All glow-in-the-dark products have phosphors. A phosphor is a substance, which radiates visible light after being energized. The two places where we most typically see phosphors are in a television screen or computer monitor and in fluorescent lights.

Chemists have created chemical substances that behave like a phosphor.

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