Custom Morphing Mugs Keith Urban Milk Hot Cold Heat Sensitive Color Changing Black and White 11 Oz Ceramic Mug 11 OZ capacity. 3.23 x 3.74 Inch. Custom Morphing coffee mug, made of 100% ceramic with durable pattern printed on the surface. Add your coffee or tea, and watch your images come to life in vibrant color. Just plain black in color when it's cold, this magical 11 oz. mug will turn white and reveal your design only when filled with a hot beverage.