Why is my candle tunneling down the middle?

What you see: the wick burns a narrow tunnel down the middle while a ring of hard wax stays stuck to the container walls.

Why it happens: the wick is too small for the container, or the first burn was too short to establish a full melt pool. Once a tunnel forms, every later burn follows the same path — the problem is permanent for that candle.

The fix: for a tunneled candle, you can sometimes rescue it by "hugging" — carefully folding aluminum foil around the top to reflect heat down and melt the walls — but it's a salvage job, not a cure. Prevention: size the wick to the container's inside diameter, and burn long enough on the first light to get a full edge-to-edge melt pool (roughly 1 hour per inch of diameter).

Worked example

An 8 oz tin is about 2.9 inches across inside. At roughly 1 hour of burn time per inch of diameter, the first burn needs about 3 hours to set a full edge-to-edge melt pool. Light it for 45 minutes instead and the candle "remembers" that narrow pool — every later burn follows the tunnel down, no matter how long you burn it after.

Common questions

Why does my candle tunnel down the middle?
Usually the wick is too small for the container's inside diameter, or the first burn was too short to melt the wax edge to edge. The first burn sets the candle's memory; a narrow first pool becomes a permanent tunnel.

Can you fix a candle that has already tunneled?
Sometimes. Wrapping foil around the top reflects heat down so the hard wall wax melts in — a rescue, not a cure. If the tunnel is deep, melting the candle down and re-pouring with a correctly sized wick is the honest fix.

How long should the first burn of a candle be?
About 1 hour per inch of container diameter, until the melt pool reaches the edges. For a typical 8 oz tin, plan on roughly 3 hours for the first burn.

Does tunneling mean the candle is defective?
It means the wick and the first burn didn't match the container. The wax and fragrance are usually fine — it's a sizing and burn-habit problem, and it's preventable on the next pour.

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