Top 3 burning questions answered!

Candle making is a complex process, with many elements to consider. Choosing the correct wick or fragrance percentage is a time consuming and lengthy process, and sometimes you just can’t figure out what is going wrong.

We have spoken to our R&D department again to answer some commonly asked questions to help you with your testing process.


Tunnelling can be caused by the candle being under wicked. This means that the wick is not the correct size and is too small to fully burn your candle wax to the edges. To avoid this, we would recommend that you try the next wick size up.

Tunnelling can also be caused by trimming your wick too short before burning. This can happen at any point in your burning process. We recommend trimming your wicks to 5mm before each burn to get the best performance. If you find that your candle has tunnelled but you think the wick size was correct, this might be your culprit. We would recommend testing again and trimming your wicks carefully.


Bridged wicks

“Bridging” occurs when burning wick curls to such an extent that the tip of the wick makes contact with the surface of the melt pool and can cause the candle to self-extinguishing.

This is cause by your wick not self-trimming or it can be that the chemical treatment is too strong on the wick for the material it is burning. Basically, this means that you have used the wrong wick for this candle.

Try testing your candle with a different wick and monitor the wicks posture.


Clubbing or mushrooming is the build-up of carbon deposits on your candle wick. It is caused by incomplete combustion. This means that there is too much fuel compared to the amount of oxygen being supplied. Usually, this happens when a candle is overwicked. We would recommend going down a wick size to try and minimising the amount of carbon being produced. A small amount of clubbing or mushrooming is not a big problem, and the candle can be left as it is.


Dancing flames can be caused by eddies or too much of a draught in a room. If a flame is flickering in your candle vessel, this can cause sooting which is not favourable. Ideally, candles should be burned in a draught-free environment.

Flickering flames can also occur when the flow of air or liquid wax to the flame is restricted or disrupted. This can be caused by carbon deposits (soot) or other impurities in the candle which can accumulate in or around the wick. This effect can be reduced or avoided by trimming the wick before lighting the candle. While careful wick selection can also help to reduce this effect, its occurrence is largely unpredictable. It is not uncommon for a candle to randomly flicker or pulse for short periods during a burn cycle, then return to normal burning behaviour.

Got other questions?

If you have any questions, contact us here or tag us using #CSburningquestions on Instagram.