Half Moon Bay Harry Potter Heat Change Mug Wanted Sirius Black

Heat change mugs have two elements. The first is a polyester coating on the ceramic surface that is suitable for dye sublimation or printing stunning full colour images. The second is the heat sensitive outer coating, which remains black (though it is slightly transparent).
Branding via a single colour screen print is available on top of the heat sensitive coating, which will always be visible, whether the mug is hot or cold.
Heat change mugs should be washed by hand to ensure that the heat sensitive coating does not degrade quickly.