CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY
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.
Model release not required. Property release not required.