This is the coolest thing EVER!!!! This mystery mug is perfect for the incognito nerds in your life. It has a black matte finish when it’s empty. But when it comes into contact with a hot beverage, the mug reveals the “Black Nerds Unite” message that’ll always make you smile and start a great conversation. Who doesn’t love a good surprise?
• 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 Europe
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.