Magic mug
A magic mug, also known as a heat changing mug, is a mug that changes colour when it is filled with a hot liquid. This effect is created by using thermochromic ink.
These mugs are often manufactured and sold as memorabilia. For example, a mug may reveal a picture of the town or monument where it was sold. They are sometimes given away to promote organisations. Customers can also have their own photographs printed on the mugs.
See also
References
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