Full colour printed mug with a heat sensitive coating When hot liquid is added this coating becomes transparent revealing the dye sublimation printed image underneath As the mug cools the heat sensitive coating restores to its original colour The WoWMug can also be screen overprinted with a permanently visible message A promotional product that is sure to be kept Hand wash only The mug base can also be printed in 1 colour extra charges apply The design has been inspected no less than 7 times to ensure you receive the best possible quality