Mardy Bum- 10oz Colour Change Mug
Watch, as the picture appears before your very eyes! The coating on the mug responds to heat, so when hot liquid is poured in, the black mug reveals a hidden message! 10oz printed ceramic, with a range of printed dialect designs on. You can even personalise them with your own message!
Due to their special coating, these mugs are NOT Dishwasher safe.