Humidity indicator

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A humidity indicator is a moisture-sensitive chemical that changes color when the indicated relative humidity is exceeded.

Humidity indicator on the lithium-ion battery of an mobile phone top: before wetting bottom: after wetting Batery model: Samsung AB653039 Suitable for the mobile phone: Samsung SGH-U800

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Some chemicals are:

cobalt(II) chloride (toxic) (blue to pink)
copper(II) chloride (yellow to blue)

See also

External links

Chemical Sensitive

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