3dRose 102580_2"Funny Champion Cow Tipper Cowin Tipping Humor Ceramic Mug, 15 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