The first time you burn your candle, please allow it to burn for 2-3 hours to create a full melt pool. "Melt pool" means that the melted wax reaches all the way to the edge of the outer area of the container. This ensures a clean, even burn all the way down. If the first burn is too short, the candle will only burn down the middle, creating a tunnel. The wicks should be no longer than 1/2 inch. Be sure to trim your wicks before lighting the candle. Trimming your wicks before lighting will increase the life of your candles. NEVER leave burning candles unattended.