3dRose 88462_4"Sea Nettle, Monterey Bay Aquarium, California-US05 JGS0147-Jim Goldstein Two Tone Mug, 11 oz, Black/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