3dRose mug_195651_3 Trust Me I Know Science Fun Scientist Humor Funny Work Job Gift Magic Transforming Mug, 11-Ounce 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 A perfect gift for any occasion; Fascinate them every time by revealing a secret or surprise image A perfect gift for any occasion; Fascinate them every time by revealing a secret or surprise image