3dRose 90191_4 Chicago Skyline at Night, Illinois-US14 DFR0127-David R Frazier Two Tone Black Mug, 11 oz, White Fill with hot liquid to transform from black to white, magically revealing image White ceramic mug with black outer surface; image printed on both sides Microwave-safe, hand-wash to preserve image A perfect gift for any occasion, Fascinate them every time by revealing a secret or surprise image