Mug for U Custom I Solemnly Swear That I Am Up To No Good Harry Potter Funny Words Ceramic Magic Color Changing Morning Coffee Tea Drinking Mug Heat Sensitive (11 oz) Material:100% ceremic The morphing mug is just plain black in color when it's cold Mug will turn white and reveal your design only when filled with a hot beverage. Just add your coffee or tea, and watch your images come to life in vibrant color You can use it as a coffee mug he picture in the morphing mug has two sides