3dRose 84410_4 Bellied Whistling-Duck, Corpus Christi, TX-NA02 RNU0372-Rolf Nussbaumer 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