Why does my candle wick have a black "mushroom shape" after burning?

The "mushroom" shape, formed at the end of a candle wick after burning, is the result of carbon buildup, where the flame consumes more wax than it can burn. It is a common occurrence and can be a sign that the wick is to large for the candle.

If "mushrooming" occurs with your candle, we recommend trimming the carbon buildup off the wick between burnings. 

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