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Property of substances to change colour due to a change in temperature / From Wikipedia, the free encyclopedia

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Thermochromism is the property of substances to change color due to a change in temperature. A mood ring is an excellent example of this phenomenon, but thermochromism also has more practical uses, such as baby bottles which change to a different color when cool enough to drink, or kettles which change color when water is at or near boiling point. Thermochromism is one of several types of chromism.

A video showing how to make thermochromatic thermal cards based on cholesteric liquid crystals