Tyrannosaurus Rex Mug

Tyrannosaurus Rex Mug
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NZ $18.99
Extinction in front of your eyes - The image you see when the mug is cold is painted over with a temperature-sensitive dye called a leucodye.  These organic chemicals change colour when heat energy causes their molecules to shift to subtly different structures (generally between colourless leuco forms and coloured forms) 

These structures absorb and reflect light differently, so they appear as very different colours when printed on a object.  This means that when this mug is hot you see the image painted with the dye, then as the mug cools down, the dye becomes transparent and the picture below it gradully revealed.

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