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Mushrooming wicks occur when the candle's combustion rate increases, which can happen for various reasons like room temperature or draughts. The good news is that they are not harmful. The only issue is that when you relight your candle, it will produce a large flame until the carbon ball has burnt off. To avoid this, simply pinch the mushroom off the wick before you relight it. This also has the added bonus of a much more even burn. Enjoy your candle!

If your candle starts tunnelling (leaving wax on the sides), just burn it for longer—around 4 hours at a time. To prevent tunnelling, make sure the first burn reaches the edges of the container. This is especially important for tin candles, which are wider and shorter than glass ones. Happy burning!