"I can't move against Grindelwald. It has to be you." This Fantastic Beasts: The Crimes of Grindelwald Professor Dumbledore Heat-Sensitive Morphing Mug shows Albus Dumbledore when hot liquid is added. The exterior of this 11 oz. mug transforms from black as hot liquid is added, revealing the hidden image in full vivid colors. Makes a great gift for fans of JK Rowling's Wizarding World and the movie Fantastic Beasts: The Crimes of Grindelwald. Hand wash only. Not dishwasher safe. Do not microwave.