This Magic Mug is guaranteed to put a smile on the face of anyone who views it. The design is hidden and the mug appears black. Once the mug is filled with a hot beverage, the design magically appears. Color Changing from Black to White exposing the full-color design. Create one for the kids or anyone who is a kid at heart. A fascinating surprise to all. This mug meets or exceeds FDA requirements for food and beverage safety.