How to choose the right wick for each candle: a practical guide for makers
Choosing the correct wick transforms a good wax blend into a candle that burns cleanly, releases scent evenly, and has an appropriate lifespan. This guide will show you which factors to consider—wick type, diameter, wax, fragrance, and design—and how to test until you find the perfect combination.
Why the wick matters
The wick is the "pump" that draws liquid wax to the flame. Its construction and thickness control the flame height, the amount of wax consumed, soot formation, and whether or not the candle forms an even melt pool. A poorly chosen wick can lead to tunneling, black smoke, or an unstable flame.
Common wick types and when to use them
- Braided cotton wicks: The most versatile. Ideal for jars and containers with most vegetable waxes and paraffin.
- Paper or fiber core wicks: Offer extra structure without metallic elements; useful for more robust pillar candles.
- Pre-waxed wicks: Common in commercial candles; their coating makes lighting easier in more fluid blends.
- Wood wicks (flat wick): Warm aesthetic and characteristic crackle; recommended for shallow vessels and decorative projects.
Avoid wicks with metal cores (lead) for safety and regulatory reasons.
How to choose based on candle type
- Jar candles: The goal is to achieve a melt pool that reaches the inner edge during the first long burn (2–4 hours). For small diameters (6–7 cm), use thin wicks; for 8–10 cm, a medium wick; for 10–12 cm and above, consider wider wicks or two wicks to prevent tunneling.
- Pillar candles (solid): Require more robust or specific pillar wicks. The harder wax and absence of a container mean the wick must sustain stable internal combustion.
- Hollow molds and sculptural candles: The design may require double or anchored wicks. The geometric shape affects how heat and melted wax are distributed.
- Wood wick candles: Work best in wide, shallow containers; their size should match the vessel's diameter to avoid a weak flame or excessive soot.
Adjustments based on wax and fragrance
- Soft waxes (soy, soy+coconut): Usually need slightly thicker wicks than their paraffin equivalent because the liquid wax is more viscous and the melt pool forms differently.
- Hard waxes (paraffin or pillar blends): Can sometimes tolerate thinner wicks, but reinforced wicks are used in pillars.
- Fragrances: A high fragrance load (e.g., >8–10%) can "drown" the flame; in that case, go up one wick size in your tests. Pure essential oils often require more adjustments than synthetic fragrances.
- Colorants: Large quantities of pigment increase the risk of soot and may require a different wick.
How to conduct proper tests (simple protocol)
- Prepare several identical containers and pour the same wax, fragrance, and color blend into each.
- Use different wicks in each container and label them.
- Cure the candles for the recommended time for that wax.
- Light the candle for the first time for 2 to 4 continuous hours. Observe the melt pool (puddle width) and flame behavior.
- Measure hourly consumption (approx.) and note any soot, tunneling, or extinguishments.
- Repeat until you find the wick that produces an even melt pool, stable flame, and minimal soot.
What each result indicates
- Wick too large: Tall flame, black smoke/soot, fast consumption.
- Wick too small: Tunneling, small flame or flame that extinguishes.
- Appropriate wick: Melt pool reaches the inner edge on the first long burn, stable flame, and minimal soot formation.
Practical tips for makers
- Start with wick sample kits to save time.
- Record each test (wax, % fragrance, pour temperature, cure time, wick used). This is the basis for reproducing results.
- Centering and securing: Use wick adhesive or wax dots to ensure the wick doesn't shift.
- Trim the wick to 5 mm before each lighting to minimize soot and maintain a stable flame.
Common mistakes and quick solutions
- Tunneling in jar candles: Try a thicker wick or let it burn longer the first time. If it's already tunneled, you can carefully melt the wax at the top edge to even it out, but ideally, you should prevent it with testing.
- Excessive soot: Reduce fragrance or switch to a better quality wick; check colorants.
- Candle extinguishes itself: Increased fragrance, wick too thin, or drafts: change the wick and improve the testing environment.
Quick summary
Choosing a wick is a balance between diameter, wax, fragrance load, and candle design. The only reliable way to get it right is through systematic testing and recording results.
If you want to learn how to choose wicks, conduct controlled tests, and make candles with our professional blends in a guided environment, sign up for our workshops in Barcelona. In our Vento Barcelona workshops, you will practice with different waxes, wicks, and fragrances, and take home candles made by you. More information and registration: https://vento.barcelona/talleres
Happy making and safe burning!
