WECE Special Don't Tread On Me Morphing Ceramic Mug When cold = mug shows a plain black, When hot = mug will turn white and reveal your design This is a morphing/color changing mug. Simple And Fashion Style Give You a Fresh Feeling. Holds 11 Ounce.Hand wash only.Can not be placed in the dishwasher. Just plain black in color then will turn white when add HOT beverages.