Your candle will burn cleanly and evenly down to the bottom of the vessel if you are careful to take the following steps. After extinguishing the flame, if necessary centre the wick in the liquid wax. To enjoy best diffusion and burning, you need to burn the candle 2 or 3 hours at a time maximum, or until the whole top of the candle goes liquid. It is essential to cut the wick short (1/4 inch) before relighting the candle to avoid unnecessary smoke. Do not place the candle in a wind draught or directly on a glass, wooden, or marble surface.