How long should I burn a candle for?
Candles should not be lit for more than four hours or until the melt pool has reached the edge of the container. This is for safety to ensure the container doesn’t overheat and potentially crack or weaken the container.
Secondly, burning candles for longer means that the container gets hotter which in turn melts the wax quicker. Whilst you may be using all your wax, you will be reducing the burn time of the candle.
Finally, the used wick will start to get longer and curl and the flame will get larger. A large flame makes the wax melt quicker and could cause your container to become too hot. The wick could also begin to lean to one side causing an uneven burn and overheating your container.
Why do I need to trim the candle wick?
Before you relight a candle, you should always trim the wick. This is an important step as it helps the wick burn down the centre giving an even burn. As the wick burns and extends in length it will begin to lean to one side and/or curl. If you do not trim the wick, the flame will become larger and your candle hotter. If you do not have any wick trimmers, small scissors will do the job just fine!
Why is my candle tunnelling?
There are two reasons for this. The first one is that the candle has the incorrect size wick which is too small for the size of the container. This means that the melt pool will never reach the edge and melt all the wax.
The second reason is that the candle is not being lit for long enough. If for example you only burn a candle for an hour, the melt pool will never reach the edge of the container. This will leave a wall of wax creating a tunnel down the middle of your candle. If you do this on your first burn, the candle creates a memory and will always burn like this.