Red, blue and white design mysteriously appears and disappears with the temperature of the beverage.
Perfect for using around the house, at the office, at parties, and more! Sherlock Holmes I Heart Sherlock 12-oz Heat- Reveal Mug Hand-wash only and do not microwave. Mug reads "Sherlock" and when it gets hot, "I Heart" is revealed! Fans of Sherlock Holmes will love this generously-sized 12-ounce, black ceramic mug. Show off your love of the world’s greatest detective with this interesting Sherlock Holmes mug from Underground Toys! Officially licensed BBC/Sherlock Holmes merchandise!.