The Color Changing Mug tells a story. Each unique coffee mug starts as a solid color with a powerful quote and artwork. As soon as you add a hot liquid, the story unfolds and the artwork transitions on the heat changing mug. The magic mugs are made of high quality porcelain, have a 16 oz capacity, and feature a unique square shape. The Color Changing Story Mug line is Microwave Safe, and dishwasher not recommended.