Chloe Adams
The base of a candle is an important part of the candle's function and design. The candle base is the area around the wick, where the wax melts and pools as it is heated by the flame. This melted wax is drawn up through the wick, where it evaporates and combusts, creating the candle's flame. The base of the flame has a distinctive blue colour due to the oxygen-rich environment, which causes the hydrocarbon molecules to vaporize and break apart into hydrogen and carbon atoms. The design of the candle base is crucial to the candle's performance, with factors such as the wick size and wax composition influencing the burn rate and stability of the flame. Additionally, the base of a candle can be affected by issues such as tunnelling, where wax melts in a circular pattern around the wick, resulting in uneven burning and potential waste. Overall, the candle base plays a fundamental role in the candle's functionality, aesthetics, and overall user experience.
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What You'll Learn
The chemical composition of candle wax
Paraffin Wax
Paraffin wax is a natural waxy substance derived from petroleum or crude oil. Chemically, it is a mixture of saturated n- and iso- alkanes, naphthenes, and alkyl- and naphthene-substituted aromatic compounds. The general formula for paraffin wax hydrocarbons is CnH2n+2. Paraffin wax burns cleanly and is the most frequently used candle wax worldwide today due to its low cost and accessibility.
Beeswax
Beeswax is a natural wax secreted by honey bees and has been used in candle-making since ancient times, including in China during the Tang Dynasty (618-907 AD) and in Europe during the Middle Ages. It is composed of various compounds, with a major component being myricyl palmitate, an ester of triacontanol and palmitic acid. Beeswax burns cleanly and is considered safer than some other waxes, making it a popular choice for candles.
Stearin Wax
Stearin wax is derived from animal fatty acids, specifically through the extraction of stearic acid. It was widely used in Europe and contributed to the opaqueness, slow burning, and hardness of candles. Stearin wax played a significant role in candle-making before the widespread use of paraffin wax.
Soy Wax
Soy wax is a vegetable-based wax derived from hydrogenating soybean oil. It was developed for commercial use in the late 1990s and is now a common alternative to paraffin and beeswax. Soy wax is often favoured for its renewable and natural source.
Tallow
Tallow is a hard fat rendered from animals, such as sheep, cows, and hogs. It was historically used in Europe and the Americas until the 18th century, when whaling practices led to the development of spermaceti wax. Tallow candles were known to produce an unpleasant smell and smoke, which contributed to the shift towards other types of wax.
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The role of the wick
The wick of a candle is a crucial component that plays a central role in its function and performance. It is the conduit that delivers fuel, typically melted wax, to the flame, where it vaporizes and combusts. This process, known as capillary action, is essential for the candle's burning mechanism. The wick's ability to draw up and transport the liquefied wax to the flame determines the candle's burning characteristics.
The design and construction of the wick significantly influence the burning behaviour of a candle. Important characteristics of the wick include its diameter, stiffness, fire resistance, and tethering. The diameter of the wick regulates the amount of fuel that reaches the flame. A larger diameter results in a larger flame, a more substantial pool of melted wax, and a faster-burning candle. Stiffness, or the rigidity of the wick, is also critical. Stiffeners, such as fine wire, paper, or synthetic fibres, are sometimes incorporated into the wick to keep it upright and ensure the fuel reaches the flame effectively.
The material used for the wick is another key consideration. Most wicks are made from braided cotton, which holds the flame and transports the liquefied wax. However, wicks can also be made from other materials such as wood, historically even asbestos, or, in the case of ancient Egyptians, waxes from available plants and animals. In the 17th century, rush-pith was used in rushlight and rush candles. The choice of wick material depends on various factors, including the type of wax, candle size, shape, colour, and fragrance.
The shape and style of the wick can also vary. Flat wicks, for example, are commonly used in taper and pillar candles. They are known for their consistent burning and self-trimming ability, as they curl back into the flame. Square wicks, on the other hand, are preferred for beeswax applications as they help prevent wick clogging. Cored wicks, which use a core material to maintain their upright structure, often have round cross-sections and provide varying levels of stiffness depending on the core material used.
In summary, the wick of a candle is not just a passive component but an essential element that significantly influences the candle's performance and burning characteristics. It is designed to transport liquefied wax to the flame while maintaining stability and consistency in the burning process. The careful selection of wick type, size, and material is critical to achieving a candle that burns cleanly, efficiently, and safely.
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How to fix candle tunneling
Candle tunneling, or uneven wax melt, is when a candle burns down its centre, leaving hard wax around the outside. This is an issue as it reduces the burn time and the scent potential of your candle.
There are several ways to prevent candle tunneling:
- Trim wicks to 1/4-inch before each burn.
- Keep candles away from drafty windows, fans, or other drafty areas.
- Allow candles to burn long enough so that the entire top of the candle melts into an even pool. The average burn time for the first use should be anywhere between one to four hours, depending on the size.
- Three-wick candles tend to burn the best and shouldn't have an issue with tunneling.
There are also several ways to fix candle tunneling:
- Use a hair dryer on high heat to blow airflow over the top of the candle until the top layer of wax has melted and smoothed.
- Wrap a piece of aluminium foil over the top of the candle, leaving a small opening for the wick and flame. This increases the heat while keeping the vessel insulated, causing the excess wax to melt.
- Remove the higher wax along the edges. This method works well if the wick is "drowning" in wax.
- Pick up a candle warmer to melt the candle's wax and release the scent without a flame.
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The history of candle-making
Candle-making was independently developed in several other ancient civilizations, including China, India, and Japan. In China, textual evidence suggests that candles may have been made from whale fat as early as the Qin dynasty (221–206 BCE). Chinese candles were also made from a variety of materials, including beeswax, stillingia tallow from the Chinese tallow tree, and wax derived from insects. Similarly, Indian temple candles were made from wax derived from boiling cinnamon, while Japanese candles used wax from the Japanese wax tree.
In Europe, candle-making primarily involved the use of tallow and beeswax from the Roman period until the modern era. Beeswax candles, in particular, were widely used in church ceremonies during the Middle Ages due to their clean burn and pleasant scent compared to tallow candles. However, beeswax candles were expensive, and relatively few people could afford to burn them in their homes. The introduction of spermaceti, a wax derived from sperm whales, in the 18th and 19th centuries marked a significant change in candle-making. Spermaceti burned cleanly and produced a brighter light than tallow or beeswax.
The 19th century saw several major developments in candle-making, including the discovery of how to extract stearic acid from animal fatty acids, leading to the creation of hard and durable stearin wax candles. This period also witnessed the introduction of paraffin wax, derived from petroleum, which burned cleanly and consistently and was more economical to produce. The invention of mechanized production methods, such as the continuous production of moulded candles, further revolutionized the industry, making candles an affordable commodity for the masses. However, with the introduction of the light bulb in 1879, candle-making began to decline.
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The gases produced by burning candles
The act of burning candles involves a complex interplay of chemistry and physics, which has fascinated scientists for centuries. The combustion of candle wax, typically composed of hydrogen and carbon atoms, results in the release of various gases and particles into the surrounding environment.
Firstly, carbon dioxide (CO2) is produced when the hydrocarbon wax combines with oxygen during combustion. This reaction breaks apart the carbon atoms in the wax, forming CO2. While carbon dioxide is not directly toxic in small concentrations, it can contribute to poor indoor air quality and potentially impact health.
Secondly, water vapour (H2O) is formed when the hydrogen atoms from the wax combine with oxygen during the combustion process. This can increase the humidity in a room, although not to the same extent as activities like cooking or showering. Water vapour emissions are generally not considered a health hazard.
Additionally, candles can produce carbon monoxide (CO) due to incomplete combustion. It is challenging to completely isolate the flame to consume all the oxygen, resulting in minimal carbon monoxide output. While low levels of exposure are not severely hazardous, carbon monoxide detectors are recommended for frequent candle burners as a safety precaution.
Moreover, candles may emit particulate matter, benzene, toluene, acetaldehyde, formaldehyde, nitrogen oxides, and fragrance chemicals. These emissions can degrade indoor air quality and potentially impact health, particularly in enclosed spaces with inadequate ventilation. Incomplete combustion processes, including candle burning, have long been known to produce by-products that are harmful to human health.
It is worth noting that the type of wax and the presence of fragrances can influence the emissions from burning candles. Paraffin wax, derived from petroleum, is a common and affordable choice for candle-making due to its low melting point and compatibility with production methods. However, it produces soot and emissions that may negatively affect indoor air quality. Natural alternatives, such as soy, beeswax, or vegetable-based waxes, are recommended to reduce potential health risks.
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Frequently asked questions
Candle tunneling is when only a small circle of wax melts around the wick while your candle is burning, instead of the wax on the entire surface of the candle. This usually means that some wax is wasted, and over time, as the tunnel deepens, it can become impossible to light the wick.
Candle tunneling is often caused by an incorrectly made candle with a wick that is too small for the size of the container. It can also be caused by a first lighting that is too brief, preventing the melted wax from reaching the edge of the candle.
To fix candle tunneling, you can use aluminum foil to reflect heat back down to the candle's edge and aid in melting the wax. You can also try scooping out the unmelted wax with a spoon until it is the same height or lower than the middle part that melts.
The "memory" of a candle refers to the barrier created when a new candle is lit for a short time, preventing the melted wax from reaching the edge of the candle. This barrier remains on subsequent lightings, causing the wax to melt at different rates and resulting in a tunneling effect.
The dark zone, also known as Zone III, is a region directly above the wick that contains unburned wax. Pyrolysis takes place in this zone, and the temperature is around 1,000 °C (1,830 °F).
