Candle Tunnelling: What It Is + How to Fix It (Step-by-Step)
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Candle Tunnelling: What It Is + How to Fix It (Step-by-Step)
If your candle is burning down the middle and leaving wax stuck around the edges, that’s candle tunnelling. It’s super common — and the good news is: in most cases, it’s fixable.
This guide explains what tunnelling is, why it happens, how to fix it safely, and how to prevent it next time.
Quick answer
Candle tunnelling happens when the candle doesn’t burn long enough for the wax to melt edge-to-edge. The candle forms a “tunnel” down the centre, leaving unused wax on the sides.
What is candle tunnelling?
Tunnelling is when:
- The candle burns a deep hole in the middle
- The outer wax stays solid and builds up around the sides
- Scent throw can feel weaker because less wax is melting
It can happen in jar candles and larger multi-wick candles if burn habits (or airflow) aren’t quite right.
Why candles tunnel (most common causes)
1) The first burn was too short
The first burn sets the candle’s “memory”. If you extinguish too early, the candle may keep burning in that smaller circle.
2) You’re doing short burns
Lighting for 20–30 minutes at a time often isn’t long enough to create a full melt pool.
3) Draughts / airflow
Open windows, fans, and busy walkways can make the flame lean, causing uneven melting.
4) Wick needs a trim (or is struggling)
A wick that’s too long can create soot and an unstable flame. A wick that’s too short can struggle to generate enough heat to melt the edges.
How to fix candle tunnelling (safe, simple methods)
Method 1: The foil “heat tent” (most popular fix)
This helps reflect heat back down to melt the wax around the edges.
- Extinguish the candle and let it cool slightly (you want the wax warm, not fully liquid).
- Carefully wrap aluminium foil around the top of the jar, leaving a small opening in the centre.
- Relight the candle and let it burn until the wax melts closer to the edges.
- Remove the foil once the top looks more even.
Tip: Keep an eye on it the whole time and keep foil away from the flame.
Method 2: Longer, calmer burns
Sometimes the fix is simply giving the candle enough time.
- Place it away from draughts
- Trim the wick
- Burn long enough to reach a full melt pool
Method 3: Gently level the wax (only once cooled)
If there’s a stubborn ridge, you can sometimes tidy it once the candle is fully cool and set.
- Don’t scrape aggressively
- Keep the wax surface clean
How to prevent tunnelling next time
- Plan the first burn: let the wax melt edge-to-edge.
- Avoid short burns: if you want a quick scent boost, use wax melts instead.
- Trim the wick: a neat wick helps a steady flame.
- Avoid draughts: stable flame = even melt.
Does tunnelling waste wax?
Yes — it can leave a lot of wax unused on the sides. Fixing tunnelling helps you get more value and a better fragrance experience.
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