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anti-fogging mirrors

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rtell | 10:06 Tue 26th Feb 2002 | How it Works
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How do anti-fogging mirrors work?
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Avatar Image woolley
The mirror is sprayed with a liquid - a surfactant - which dries to form a clear film. When water hits a mirror, it would normally form beads. But with a surfactant the beads run together and you can see through it. A surfactant is a chemical, a form of detergent, that lowers the surface tension of water.
10:18 Tue 26th Feb 2002
Avatar Image HGray
A good emergency anti-fogging device is a slice of raw potato. Rub over a surface and then wipe away any excess.
10:36 Tue 26th Feb 2002
Avatar Image incitatus
Or apply a weak soap solution (works well while shaving). or in extremis lick the mirror as saliva acts the same way.
11:15 Tue 26th Feb 2002

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