The dark knight comes to life in this unique artwork by blend cota. Made up of a variety of colors instead of the standard black, batman pops off the drinkware as hot liquid is added, ready to defend Gotham city. The exterior of this officially licensed 11oz mug transforms from black as hot liquid is added, revealing the hidden image in full vivid colors. While this mug may be used in the dishwasher or microwave, for the longest-lasting, highest quality product, we strongly recommend against it.