The most unique mug you will ever own! The Craft Express Black Color Changing Mug creates magic before your eyes! Like all other Craft Express mugs, this mug is FDA approved and safe to use. Activated by heat, the Craft Express Black Color Changing Mug starts off black and slowly reveals your design when a hot beverage is poured in!Great for birthdays, holidays and other life events, it gives recipients a fun surprise the next time they go to pour their coffee.Details:Color changing11 oz. (330 mL)Dishwasher and Microwave safeFDA approvedCeramicSublimation Instructions:Wrap your transfer around your mug and adhere it using heat tape.Press your mug at 392°F for 3.5 minutes using a medium pressure.Quickly remove your transfer sheet and reveal your finished product.CAUTION: Item will be hot!