Experience a little marauders magic with this heat change mug. Simply read the spell on the front of your mug, pour in your hot drink and watch the footprints appear. Turn the mug around and see the marauders concealing spell appear. As the mug cools the concealing spell will work it's magic making itself and the footprints disappear.
When cold/room temperature: it reads “I solemnly swear that I am up to no good”
When hot drink added: Foot prints and concealing incantation slowly appear
Official Harry Potter Licensed Merchandise