Bridging occurs when the chemical treatment on the wick is not compatible with the chosen wax and fragrance combination. Chemical treatments on wicks are intended to aid combustion and allow the wicks to self-trim, so if an incompatible wick is used, the wick may not self-trim and could start to bridge.
What to do when a candle is bridging:
If you are trying to find the best wick for your candle and you notice that your candle wick is bridging, try different wicks as described above. If you are burning a candle and the wick isn’t self-trimming, we recommend trimming the wick manually every few hours or so to avoid creating a full bridge or an excessively large flame.