This mug has a black matte finish when it's empty. But when it comes into contact with your hot chai or coffee during Suhoor, it will come to life in such a way you'd never expect anything could EVER possibly come to life in the wee early hours before Fajr. And what better way to be reminded you only have a few minutes left than with an alarm clock?
Black matte finish when cold; design is revealed when exposed to hot liquids
Note that in some instances the coating might not be 100% opaque and an outline of the design might peek through a little. Also, avoid putting the mugs in a microwave or dishwasher since it can damage the coating.