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They are also known as morph or chameleon mugs.

Thermochromic paint is a relatively recent development in the area of color-changing pigments. It involves the use of liquid crystals or leuco dye technology.

After absorbing a certain amount of light or heat, the crystallic or molecular structure of the pigment reversibly changes in such a way that it absorbs and emits light at a different wavelength than at lower temperatures.

Thermochromic paints are seen quite often as a coating on coffee mugs, whereby once hot coffee is poured into the mugs, the thermochromic paint absorbs the heat and becomes colored or transparent, therefore changing the appearance of the mug.

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