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{{#REDIRECT [[Humidity}} indicator card]]
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A '''humidity indicator''' is a moisture-sensitive chemical that changes color when the indicated [[relative humidity]] is exceeded.
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==Chemicals==
Some chemicals are:
* [[cobalt(II) chloride]] (toxic) (blue to pink)
* [[copper(II) chloride]] (toxic) (yellow to blue)
[[File:Humidity indicator before & after wetting.jpg|thumb|left|380px|Humidity indicator on the lithium-ion battery of an mobile phone
<br/>top: before wetting
<br/>bottom: after wetting
<br/>(battery model: Samsung AB653039)]]<!-- Suitable for the mobile phone: Samsung SGH-U800-->
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== See also ==
* [[Moisture analysis]]
* [[Humidity indicator card]]
* [[Desiccant]]
== External links ==
*[http://www.healthocrates.com/Chemical-Sensitive/ Chemical Sensitive]
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[[Category:Desiccation]]
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