Thermochromic mug changing colour

Thermochromic mug changing colour

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Credit: CORDELIA MOLLOY/SCIENCE PHOTO LIBRARY

Caption: Thermochromic mug changing colour. As the sides of the mug heat up due to the hot drink it contains, the dark dye becomes transparent, revealing the picture of a cat beneath. The dark layer contains a leuco dye. Leuco dyes are molecules that can take two forms, one of which is coloured and the other colourless. The transition occurs at a certain temperature, determined by the structure of the molecule.

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Keywords: 21st century, cat, change, changing colour, chemical, chemistry, effects, gift, gimmick, heat, heat-sensitive, hot drink, mug, novelty, physical, physical effect, physics, thermochromic, thermochromic mug, thermochromism, three, trio

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