Start by trimming the wick to 1/4–1/8 of an inch in length, every time you burn. You can use a plain old pair of scissors to do this, but once the candle burns down, it'll get harder to reach the blades far enough into the jar — that's why I like to use nail clippers instead. But if you're a serious candle fanatic, you might want to invest in a wick trimmer.
Trimming the wicks will keep the candle burning without any black soot and it will give your candle a longer burn time. Here is what happens when you do not trim the wicks properly. When a wick gets too long it cannot draw wax all the way up to the top of the wick. Therefore, the wick itself will start to burn.
Candles should not be burned for more than four hours at a time. It is recommended that they burned for four hours, then extinguished and let cool for two hours before relighting.
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