The Durham-style Standard WoWMug ® is a full colour printed mug with a heat sensitive coating. When cold, the mug looks like a standard black or blue Durham mug. However when hot liquid is added, the coating becomes transparent revealing the dye sublimation printed image underneath. Then as the mug cools the heat sensitive coating restores it to its original colour. There is also the option with the Standard WoWMug ® that it can be screen over-printed with a permanently visible message, although this is at extra cost. This mug is a great promotional product. Due to the nature of the coating used however, it is not dishwasher safe and should only be hand washed. For further information on our Standard WoWMug ® please contact us directly via the Submit Enquiry button below.