Why Candles Tunnel — and How to Get an Even Burn

Tunneling is when a candle burns straight down the middle, leaving a ring of unused wax stuck to the glass. On a candle you paid properly for, it can waste a third of what you bought. It's mostly preventable, and it mostly comes down to the first time you light it.

Why it happens

Wax has a memory. On the first burn, the melt pool spreads only so far before you blow the candle out, and every subsequent burn tends to follow that same edge. Extinguish the first burn early and you've set a narrow path the candle will follow for its whole life.

The other cause is a wick too small for the vessel's diameter. That's a manufacturing problem you can't fix at home, though the technique below helps.

The fix: get a full melt pool the first time

On the first burn, leave the candle lit until the melted wax reaches the edge of the container all the way around. Depending on the size, that's usually two to four hours.

This is the single most important thing you can do for a candle, and almost nobody does it. Light a new candle when you have an afternoon at home, not for twenty minutes before bed.

Never leave a burning candle unattended, and don't burn any candle for more than about four hours at a stretch.

Trim the wick every time

Before each burn, trim to roughly a quarter inch. A long wick produces a large flickering flame, which causes soot, uneven burning, and a faster burn.

Nail scissors work fine. So do your fingers on a cold wick, if you don't mind the mess. Remove the trimmings from the wax before lighting.

Keep it away from drafts

A candle near a vent, open window, or walkway burns unevenly because the flame leans. That leaning melts one side faster and creates a sloped melt pool. Move it somewhere still.

If it's already tunneling

Two options, in order of preference.

The foil method. Wrap aluminum foil around the top of the jar, leaving a hole in the middle over the flame. The foil reflects heat down onto the unmelted ring and evens it out over an hour or two. Repeat if needed. Watch it while it's lit, and take the foil off before the glass gets hot enough to be uncomfortable.

Scrape it out. Less elegant, entirely effective. Use a spoon to remove the hardened ring, then burn normally. The wax you remove can be melted in a warmer.

The last inch

Stop burning when about half an inch of wax remains. Past that, the flame sits close enough to the base that the glass can get hot enough to crack. That leftover wax isn't waste — pop it out and use it in a wax warmer.

Starting fresh

If you're buying a new candle and want to do this properly from the first light, ours are hand-poured from a tallow and beeswax blend in small batches: Rose Bud for fresh florals, Date Night for something warmer, and Sunday Afternoon for bright citrus. Burn instructions are on every label for exactly this reason.

If you're weighing waxes more broadly, we compared tallow against soy, beeswax, and paraffin.