Ah, the memories of your trips aboard the Hogwarts Express™. Pour hot liquid into this Morphing Mugs™ heat reveal mug and watch the antiquated, scrapbook-style image of Platform 9¾™ appear. The mug remains black when cold so you can keep your wizarding ways a secret from nosy coworkers. Also, makes a great gift for anyone starting a new school year or career! The exterior of this officially licensed mug transforms from black as hot liquid is added and revealing the hidden image in full vivid colors. While this mug may be used in the dishwasher or microwave for the longest lasting and highest quality product, Morphing Mugs™ strongly recommend against it.