A magic mug, also known as a heat changing mug, transforming mug, or disappearing mug is a mug that changes color when it is filled with a hot liquid. This effect is created by using thermochromic ink.
Magic 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, for example the Haunted Mansion/Grim Grinning Ghost Disney cup.1 They are sometimes given away to promote organizations. Customers can also have their own photographs printed on the mugs.2
References
References
- Coffey, Kelly (2020-05-28). "Heat Sensitive Haunted Mansion Themed Coffee Mug Materializes Into Disney World". Inside the Magic. Retrieved 2022-02-23.
- Tansill-Suddath, Callie (19 July 2018). "This Color-Changing Photo Mug Will Let You Surprise Your BFF With A Secret Picture". Bustle. Retrieved 2022-02-23.