This Harry Potter cold changing glass is sure to get your morning off to a magical start. Room temperature, the front of the glass shows the Hogwarts Crest in black and white on the front and the Harry Potter logo in white on the back. When cold liquid is poured in, the Hogwarts Crest transforms to show its yellow borders and house colours. Once the drink is finished the glass returns to its original state as it warms back up to room temperature. Housed in a printed gift box, this is an essential for any Harry Potter fan.