Rock-solid or melted DARS Chocolate bars let you know

Even before you can open its wrapper, the Japanese chocolate DARS indicates its condition (melted or not) via a tiny chemical thermometer on the outside carton. According to them the best temperature to savor the treat is at 22° C that's about 71.6° F. The company is even offering regular customers the opportunity to pick up a special chocolate storage drawer known as "the chocolate cellar" that's designed to help maintain the perfect temperature.