Magic Colour Changing Mug .  The colour change mug has a heat sensitive thermochrome coating which reveals a personalised design or image when filled with hot liquid. Full Colour Dye Sublimation Printing. For less print colours, lower prices are available. Available in Black or Blue. Dimensions: Height 9 cm, Diameter 8 cm. Print Area: 18 X 9.2 cm. Price includes printed full colour.