Black when cold, print appears when hot liquid is added! Great mug !
• Dimensions: 3.54″ (8.9 cm) in height, 3.35″ (8.5 cm) in diameter
• Black glossy finish when cold
• Reveals the print when exposed to hot liquids
• NOT dishwasher or microwave safe
• Blank product sourced from China
Note that in some cases the coating might not be 100% opaque and the outline of your design might peek through a little.