Candle Tunnelling:
What It Is (and How to Stop It Ruining Your Candle)
There are few things better than lighting a candle, getting cosy, and letting the scent slowly fill the room. But if you’ve ever looked down and noticed your candle burning straight down the middle… you’re not alone.
That frustrating dip in the centre?
That’s called candle tunnelling, and thankfully, it’s both common and fixable.
Let’s talk through what’s happening and how to stop it.
So… What Is Candle Tunnelling?
Candle tunnelling happens when only the centre of the candle melts, leaving a solid ring of wax around the edges. Over time, the wick burns deeper and deeper, wasting wax and shortening the life of the candle.
In some cases, the wick can even end up buried in wax once the candle cools, making it tricky (or impossible) to relight.
Not ideal.
Why Does It Happen?
Most of the time, candle tunnelling comes down to one thing:
👉 The first burn
When you light a candle, the melted wax should spread all the way to the edges of the jar. This is known as a full wax pool.
If the candle is snuffed out too soon (we snuff, we dont blow 😉) the wax sets unevenly. Candles have wax memory, the candle will “remember” its first melt pattern. Once that uneven shape forms, the candle will keep burning that way unless it’s corrected.
How To Prevent Candle Tunnelling
A little patience goes a long way here.
• On the first burn, allow the wax to melt fully edge-to-edge
• As a guide, burn for around 1 hour per inch of candle width
• Keep candles away from draughts
• Trim the wick to ¼ inch before lighting each time
• Quality wax and the correct wick size make a difference
Once your candle has burned evenly the first time, it’s far more likely to behave itself in future burns.
Already Tunnelling? Here’s How To Fix It
Don’t worry! Your candle isn’t ruined.
1. Let It Burn Longer
If the tunnel isn’t too deep, try a longer burn (around 3–4 hours) to encourage a full wax pool.
2. The Hairdryer Trick
For mild tunnelling, gently melt the surface wax using a hairdryer. Once it cools evenly, relight and allow the wax to fully melt across the top.
3. The Foil Method (For Deep Tunnels)
Trim the wick to ¼ inch, wrap foil around the candle to create a dome, leaving a small opening at the top. Light the candle and let the reflected heat melt the wax evenly over 1–3 hours.
A Final Thought
Candle tunnelling is one of the most common candle problems, and one of the easiest to avoid.
Slow down, let that first burn do its thing, and your candle will thank you for it.
Candleboys 6th January 2026