Heat Reactive Monday Morning Mug that changes with hot drink heat Morning mug is the perfect way to start your day. Our heat sensitive photo mugs are fantastic 'magic' fun, the mug coating 'disappears' when the mug is hot to reveal a new face. Considering how hard it is to start your day in the early ours this mug will give you a little smile when you sip your hot drink and see it change picture. The perfect gift for those who struggle in the morning. Confuse your co-workers and keep your kids distracted by placing steaming hot beverages in a mug that plays a subtle magic trick on the eyes. Morning mug will change back color when the hot drink has changed to lukewarm