Who doesn't love a good surprise? With this color changing coffee mug, you're definitely in for a great one. This mug has a black matte finish when it's empty. But when it comes into contact with a hot beverage, the mug reveals a beautiful print that'll always make you smile when having your drink of choice. • Ceramic • Black matte finish when cold • Reveals the print when exposed to hot liquids • Dimensions: height - 3.85" (9.8 cm), diameter - 3.35" (8.5 cm) • Made in China. Printed in the USA and EU Note that in some instances the coating might not be 100% opaque and an outline of the design might peek through a little. Also, you shouldn't put the mugs in a microwave or dishwasher since it can damage the coating.
Finally prove to your significant other that those magic lessons were WORTH IT. Hot liquid will change the color of the mug from black to white, reveling some text that may get you labeled as a borderline alcoholic in the office. But once you get a sip of Echobeer, coffee just doesn't do it anymore.