How do “change the picture with heat” mugs work?

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How do “change the picture with heat” mugs work?

In: Chemistry

Some paints have a property named *thermochromism* (thermo = heat, chromism is a word used for processes involving colour changes)

Specifically, dyes used for mugs and the sort tend to be leuco dyes, which can change between a form with colour and a form that is transparent. So you paint two images, with one available during one temperature, and another available during another temperature.