The world of Harry Potter comes alive with this "I Solemnly Swear...Mischief Managed" heat changing mug. Fill this mug with hot liquid and the text changes from "I Solemnly Swear That I Am Up To No Good" to "Mischief Managed." This 11-ounce mug changes from black to a creamy, off white color, completing the transformation. This mug makes a great gift for any Harry Potter fan.
Due to the hidden dark magic involved, this mug is NOT MICROWAVE SAFE and NOT DISHWASHER SAFE . Please hand wash only with a non-abrasive cleaner and soft sponge.