Always let the candle burn until its surface is completely liquid. This step can take a long time, especially the first time you burn it. Once the wax is completely liquid, you can let the candle burn for a maximum of one hour. The layer of liquid wax should never be more than one centimeter high. Never exceed the maximum burning time stated on the package insert and do not let the candle burn to the end. Systematically keep an inch of wax on the ground.