Magic Photo Mug

Suprise someone with this magic mug

Suprise someone with this magic mug. The mug looks black at first with the photo becoming visible when the cup contains hot liquid.
Material: white ceramic Height: 9,5 cm Diameter: 8,2 cm Content: 33 cl Image size: approx. 9,6 x 8 cm (landscape) or 6,4 x 8 cm (portrait) Dishwasher and microwave safe, but hand washing recommended to preserve vivid colors	Minimum resolution: 756 x 630 pixels (landscape) and 504 x 630 pixels (portrait) Recommended resolution: 1.134 x 945 pixels (landscape) and 756 x 945 pixels (portrait)