Who doesn't love a good surprise? The mug shows as black until warm liquids are poured into the mug. We won't judge you for slipping this into your office's coffee cup collection.
• 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.