Mug, Living to Extinct Tyrannosaurus Rex

Add a hot beverage and watch as the T-Rex disappears and turns into a fossil!
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Do you love dinosaurs and all things fossil related? Then this is the mug for you! Watch as the Tyrannosaurus Rex disappears before your very eyes and turns into a fossil. All you need to do is add a hot beverage!

This incredible transformation happens a lot more quickly than the extinction of the real T Rex, which is thought to have occurred approximately 68 million years ago during a massive extinction event that destroyed roughly three-quarters of life on Earth at that time.

Age: 6+

What You Get

Living to Extinct - Tyrannosaurus Rex Mug from Heebie Jeebies. Includes a porcelain mug with an image of a tyrannosaurus rex that changes to a fossil when hot liquid is poured into the mug.

How Does it Work?

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 an 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 is gradually revealed.


  • Paleontology
  • Chemistry

WARNING: CHOKING HAZARD Small Parts. Not for children under 3 years.

More Information
Length (cm) 13
Width (cm) 11
Height (cm) 10
Age Group 7-8 Years, 9-10 Years, 11-12 Years, 12+ Years
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