Magic mug

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A promotional magic mug.

A magic mug is a mug that, when filled with a hot liquid, changes colour. This effect is created by using a special oxidized ink.[1]

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.

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