Twisted wicks are the quickest to make but tend to mushroom at the tip and need frequent trimming, while a braided wick of three or more strands burns more evenly, self-trims better and lasts longer. Flat wicks cut from woven cotton cloth suit lamps with a flat wick slot, such as betty lamps and kerosene lamps.
Part of Oil Lamp Construction
A wick’s construction decides how carbon forms at its tip. Twisted wicks mushroom and need trimming often, while braided and flat wicks burn more evenly.
Construction Controls How The Tip Burns
The overview compares three constructions:
| Type | Made by | Behaviour |
|---|---|---|
| Twisted | Twisting cotton strips | Burns adequately, but tends to mushroom at the tip and needs frequent trimming |
| Braided (3 or more strands) | Plaiting strands | Burns more evenly, self-trims better, lasts longer |
| Flat | Cut from woven cotton cloth | Best for betty lamps and kerosene lamps with flat wick slots |
The mushroom is a ball of carbon that forms on the tip. It blocks the flow of fuel and makes the flame flicker and smoke. A braid’s structure curves the tip as it burns and exposes the char to air, which helps it burn away instead of piling up. That is a commonly given explanation for a braid “self-trimming”; it reduces trimming but does not remove it.
Method: Braiding Three Strands
Step 1: Prepare strands. Take three equal strands of cotton string or thin cotton strips, each longer than the finished wick.
Step 2: Tie off. Knot or pin the three together at one end.
Step 3: Plait. Cross the right strand over the middle one, then the left strand over the new middle one, and repeat, keeping tension even.
Step 4: Finish. Knot the far end, cut to length, and test in fuel. The braid should be snug but not hard: a tight braid starves the flame, a loose one frays.
Method: Twisting
Twist two or more strips tightly in one direction, then fold and let them twist back on themselves so they hold together. Stand one end in fuel to check that it wicks.
Common Mistakes
- Plaiting too tight. A hard braid has no gaps to carry fuel.
- Leaving loose threads. They burn first and make an uneven flame.
- Forgetting to trim a twisted wick. It mushrooms and smokes.
Safety
A mushroomed wick makes smoke
A flame that has a carbon ball on its tip burns incompletely and soots. Soot means incomplete combustion and carbon monoxide, which cannot be seen or smelled. If you notice smoke, trim the wick, lower the flame and ventilate with an inlet and an outlet. See Wick Trimming.
What’s Next
- Learn next: Wick Trimming — keeping any wick clean
- Combine with: Betty Lamp & Cruise Lamp — a flat-wick design