Always melt chocolate slowly, at a low temperature. The melting point of chocolate is between 86° F. (30° C) and 90° F. (32° C), lower than body temperature. Using high heat is very risky and the most common cause of grainy and/or lumpy chocolate. Chocolate melts better and faster when using lower temperatures. Never let the temperature of your chocolate get above 115° F. Milk and white chocolates, which are more heat sensitive, should not be heated above 110° F. Use an instant-read thermometer to check the chocolate's temperature while melting.