Maddie James
Candles have been used for thousands of years, from the Paleolithic period to modern times, and are a great way to create a cozy atmosphere. However, keeping a candle lit requires more than just a naked flame from a match or lighter. The candle's wick, wax, and vessel can all influence how it burns. For example, the longer the wick, the harder it is for the wax to flow to the top and fuel the flame. This is why wick length and type are crucial to keeping a candle lit.
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What You'll Learn
The importance of trimming the wick
Trimming the wick of a candle is crucial to its performance and longevity. While it may seem counterintuitive, it is important to remember that it is the wax that fuels the flame, not the wick itself. The wick acts as a conduit, drawing the melted wax upwards through capillary action to feed the flame. Therefore, if the wick is too long, the wax may not be able to reach the flame, causing the candle to dim or extinguish.
Trimming the wick to a length of about 1/4" to 1/8" above the surface of the wax is recommended. This ensures that the wax can travel efficiently up the wick to fuel the flame. A longer wick can hinder this process, resulting in an uneven burn, excessive smoke, and wasted wax. Trimming the wick also helps to prevent the build-up of charred material, which can further impede the flow of wax and cause the candle to produce smoke.
The type of wick also plays a role in the candle's performance. Different types of wicks, such as square wicks, cored wicks, and wooden wicks, each have unique characteristics and burning properties. For example, square wicks provide a strong flame, while wooden wicks tend to burn hotter and faster than cotton wicks. Choosing the right type of wick and ensuring it is properly trimmed can help to create a clean, efficient burn.
In addition to trimming the wick, other candle care practices can also impact its performance. Limiting burn time to 2-4 hours at a time and allowing the candle to cool completely before relighting can help prevent overheating and potential safety hazards. Proper storage in a cool, dry place, away from direct sunlight, can also prolong the life of the candle by preventing discolouration, fading, and dust accumulation.
By following these practices, candle enthusiasts can ensure a clean, efficient burn, maximise the life of their candles, and create a cosy and enjoyable atmosphere.
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The impact of wax type
The type of wax used in a candle has a significant impact on its performance and burn quality. For instance, candles made from all-natural waxes and fragrance oils can be sensitive to temperature and light, causing them to change colour or sweat with excess fragrance. Natural wax candles should be stored in a cool, dry place, away from direct sunlight, to prevent discolouration and preserve their scent.
In the 18th and 19th centuries, spermaceti, a waxy substance derived from sperm whales, was used to make superior candles that burned longer, brighter, and without an unpleasant odour. However, due to the high cost, colza oil and rapeseed oil eventually became popular as cheaper substitutes. Today, beeswax is considered a luxury material for candle-making, as seen in the 16th century when beeswax candles were luxury items for the wealthy. Modern candles, on the other hand, often use blends of natural and renewable waxes, which offer better fragrance diffusion ("scent throw") and a cleaner burn than paraffin wax.
The type of wax also determines how long a candle can be burned safely. For example, jar candles should be extinguished before burning down to half an inch of wax to prevent overheating and safety hazards. Additionally, candles should not be burned for more than 2 to 4 hours at a time, and it is recommended to let them cool completely before relighting.
Different types of wax also require specific wicks for optimal burning. For instance, square wicks, which are braided and have a sturdy, rounded appearance, are ideal for beeswax candles as they provide a strong flame. Cored wicks, which use materials like paper or zinc, help the wick stay upright, while wooden wicks burn hotter and faster than cotton ones. Ultimately, matching the right wick to the right wax is essential for a candle that burns efficiently and safely.
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The role of oxygen in combustion
Oxygen is one of the three main ingredients required for fire, along with heat and fuel. In the case of a candle, the wax acts as the fuel. When the wick of a candle is lit, the wax melts and is drawn up through the wick, providing fuel for the flame. The oxygen in the atmosphere combines with the fuel from the candle to produce carbon dioxide and water vapour, in a process known as complete combustion.
Complete combustion occurs when there is sufficient oxygen to burn the fuel completely, leaving no residual fuel or oxidant. In the case of a candle, this means ensuring that there is enough oxygen available to combine with the wax fuel. If there is insufficient oxygen, the candle may struggle to stay lit, or the combustion may produce byproducts such as carbon monoxide or unburnt hydrogen.
The quality of the candle wick also plays a role in the combustion process. Different types of wicks, such as square wicks, cored wicks, or wooden wicks, can affect the strength of the flame and the rate at which the wax is drawn up. Additionally, the length of the wick is important. If the wick is too long, it may be difficult for the wax to flow to the top, affecting the combustion process. Therefore, maintaining the proper wick length and ensuring an adequate oxygen supply are crucial for optimal combustion in candles.
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How to prevent candle tunnelling
A candle needs a few things to stay lit, including a good quality wick, the right wax, and a well-sized flame. Ensuring these components are well-maintained and cared for will help prevent candle tunnelling.
Candle tunnelling occurs when only a small portion of the wax around the wick melts, causing the candle to cave in on itself. This creates an uneven burn, significantly shortening the candle's lifespan. To prevent tunnelling and create an even burn, follow these steps:
Firstly, choose a candle made from quality materials such as soy wax and cotton wicks, which provide a clean and even burn. Ensure the number of wicks is appropriate for the candle's size; larger candles may require multiple wicks. Before lighting, trim the wick to between 1/8 and 1/4 of an inch above the wax surface. This will help the wax flow smoothly to the top of the wick. Keep the candle away from drafts, as these can cause uneven burning.
Secondly, when burning the candle, ensure it stays lit for long enough for the entire top layer of wax to melt evenly. The recommended burn time is about one hour for each inch of the candle's diameter. For example, a four-inch candle should burn for about four hours. This will help prevent tunnelling and extend the candle's lifespan.
Finally, when burning candles for multiple hours, regularly check the wick for carbon accumulation. If the wick starts to "mushroom," trim it again. For severe tunnelling, you may need to scrape out excess wax to even the surface or melt down the candle and transfer it to a new vessel with a fresh wick. Remember to always follow the specific burn instructions included with your candle and enjoy your long-lasting, evenly burning candle!
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Candle safety and burn time
Candle safety is paramount, and it is important to be aware of the potential fire risks associated with candles. According to the National Candle Association, 85% of candle fires could be avoided if consumers followed three basic safety rules: never leave a burning candle unattended, never burn a candle near anything flammable, and keep candles out of the reach of children and pets. It is also important to always use a heat-resistant candle holder, and to keep the wax pool clear of wick trimmings, matches, and debris. Additionally, do not burn a candle all the way down—discontinue use when half an inch of wax remains in the container, or two inches for pillar candles.
To ensure a candle stays lit, it is important to maintain the wick. Before lighting a candle, trim the wick to a length of ¼ inch. Long wicks can cause uneven burning, dripping, or flaring. If a candle is not staying lit, the wick may be too long, making it difficult for the wax to flow to the top of the wick. In this case, melt the wax around the wick with a match or lighter, then dab away the excess wax with a paper towel. Alternatively, the wick may be too short, in which case you can melt the wax around it and drain the excess to give the wick more space to burn.
The first burn of a candle is the most important, as it sets the 'memory' of the candle. Candles should burn for one hour per inch of their diameter. For example, a four-inch-diameter candle should burn for a minimum of four hours to liquefy the entire top layer of wax. If the first burn does not liquefy the wax from edge to edge, the candle will create a 'memory ring' and will tunnel for the rest of its life.
The burn time of a candle can be calculated through a Full Burn Test or a Partial Burn Test. The Full Burn Test involves burning the candle in 2–3 hour intervals and keeping track of how many burns it takes for the candle to completely burn down. The burn duration is then multiplied by the number of burns to get the approximate burn time. For example, if a candle burned for 2–3 hours at a time and took 25 burns to fully burn down, its approximate burn time would be 50 hours. The Partial Burn Test involves measuring the weight of the candle before and after a controlled burn, then subtracting the weight after burning from the beginning weight to determine the amount of wax used. This weight is then divided by the burn time hours to get the total burn time.
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Frequently asked questions
The ideal wick length for a candle to stay lit is 1/8" or about 3mm. If the wick is too long, it will be difficult for the wax to flow to the top of the wick. If the wick is too short, it may be difficult to light.
Square wicks are considered the best choice for beeswax candles. They have a sturdy, rounded appearance and provide a strong flame when lit.
It is recommended that you don't burn a candle for longer than 4 hours at a time. Burning a candle for too long can create a safety hazard.
To safely extinguish a candle, use a candle snuffer or a bell snuffer. Avoid blowing out the candle, as this can cause the fire to spread.
