Pour in your favorite hot beverage and watch as Hogwarts appears from the darkness. This wonderful Harry Potter Hogwarts Heat Change Mug captures the wonder of Hogwarts School of Witchcraft and Wizardry, allowing you to enjoy a magical tea-break. This mug features a decal that changes with the heat. When cold the mug is black, with just the Hogwarts crest and some candlelit windows visible. However, once a hot drink has been made, the moonlit buildings of this famous school appear from the darkness. The Harry Potter Hogwarts Heat Change Mug makes a perfect gift for any Harry Potter fan! Hand wash only. Not dishwasher safe. Do not microwave. Ages 14 and up.