Chloe Adams
Candles have been used for over two millennia, and while they are no longer a necessity for illumination, they are still commonly used for functional, symbolic, and aesthetic purposes. The use of candles dates back to 3,000 B.C. when ancient Egyptians used papyrus reeds dipped in animal fat as torches. The ancient Romans also played a role in the history of candles, creating early forms of candles by dipping wicks into tallow, a rendered form of animal fat. While candles have evolved over the years, with various materials being used for their creation, one might wonder if they contain cells.
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What You'll Learn
- Candle wicks: Wicks should be absorbent to draw wax and fragrance
- Candle wax: Wax is the fuel that burns to keep the candle alight
- Candle history: Candles have been used for over two millennia
- Candle emissions: Candles emit volatile organic compounds, including carbon
- Candle alternatives: Non-toxic candles are an alternative to prevent the release of harmful compounds
Candle wicks: Wicks should be absorbent to draw wax and fragrance
A candle's wick is a critical component of its functionality. The purpose of a wick is to deliver fuel (wax) to the flame, acting as a fuel pump. The wick draws the liquefied wax up into the flame to burn through capillary action. The size of the wick is important, as too much fuel will cause the flame to flare and soot, while too little fuel will cause the flame to sputter out.
Candle wicks should be absorbent to draw wax and fragrance. The wick absorbs the liquid wax and pulls it upward. The wax then vaporizes from the flame's heat, turning into a hot gas that burns the scented vapour wax and releases fragrance. The braiding of the fibres in the wick encourages a slower absorption of fuel, resulting in a calmer and more consistent flame. Different types of wicks include cotton, wooden, and paper wicks.
Cotton wicks are the most traditional and popular variety. They are made of cotton fibres braided together into a single string, which can then be dipped, coated, or treated to provide optimum performance. The braiding of the fibres encourages a slower absorption of fuel, resulting in a calmer and more consistent flame. Cotton wicks can also be twisted, like a birthday candle, which pumps the fuel into the flame much quicker.
Wooden wicks have gained popularity in recent years for the visual aesthetic and soft crackling sound they create. They typically come in the form of flat rectangles and can be single, double, or triple-ply depending on the size of the candle, type of wax, and fragrance used. Wooden wicks can also be found in unique shapes such as crosses or circles.
Paper wicks are another option, which can be used to stiffen the wick and aid in keeping it straight so that the fuel can continue to pipe straight up into the flame.
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Candle wax: Wax is the fuel that burns to keep the candle alight
Candle wax is the fuel that burns to keep a candle alight. The wax is drawn up through the wick and transformed into a liquid state. The heat of the candle flame then causes the wax to vaporize, turning it into a flammable gas. This vapour then burns, releasing heat and light. The process continues as long as there is wax to be drawn up through the wick and oxygen is present.
The wax is composed of hydrogen and carbon atoms, known as hydrocarbons. These hydrocarbons are long chains of connected carbon atoms surrounded by hydrogen atoms. This composition means that wax takes a solid form at room temperature, allowing it to be formed into the flakes and slabs used to make candles.
When a candle burns, the wax is oxidized, reacting with oxygen to keep the flame alight. This combustion reaction turns the solid wax into carbon dioxide gas and water vapour. The heat generated by the flame is what melts the wax, which is then drawn up into the flame and burned, creating a continuous cycle.
The rate at which a candle burns depends on the type of wax used. Different waxes will burn at varying rates and temperatures. For example, paraffin wax, derived from petroleum oil, is a common form of candle wax. However, concerns have been raised about the safety of paraffin candles due to the release of toxic chemicals during combustion.
It is important to note that while candles are a source of light and warmth, they should always be used with caution to prevent accidents and ensure safety.
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Candle history: Candles have been used for over two millennia
Candles have been used as a source of light for over two millennia, with the earliest use of candles attributed to the Ancient Egyptians in 3000 B.C. They made rushlights or torches by soaking the pithy core of reeds in melted animal fat. However, these early candles did not have a wick.
The ancient Romans are generally credited with developing the wicked candle before the Egyptians by dipping rolled papyrus repeatedly in melted tallow or beeswax. The resulting candles were used for lighting their homes, aiding travellers at night, and in religious ceremonies. Romans also made true dipped candles from beeswax, although these were expensive and only the wealthy could afford them. Oil lamps were the most widely used source of illumination in Roman Italy, but candles were common and regularly given as gifts.
In China, textual evidence suggests that candles may have been made from whale fat in the Qin dynasty (221–206 BCE). Chinese candles may also have been made from beeswax or wax derived from insects. In India, wax from boiling cinnamon was used for temple candles. In Japan, wax from the Japanese wax tree was used.
In Europe, candles were primarily made from tallow and beeswax from the Roman period until the modern era. In the 18th and 19th centuries, spermaceti (from sperm whales) was used, followed by purified animal fats (stearin) and paraffin wax in the 19th century. Paraffin wax was introduced in the 1850s and was a boon to candlemaking because it burned cleanly, consistently, and was economical to produce.
The mass production of candles began in 1834 when Joseph Morgan, a pewter utensil maker from Manchester, England, patented a moulded candle-making machine. By the Middle Ages, candles were in wide production and usage due to their portability and safety compared to other sources of light. They also gained significance in Christian churches for their decorative, symbolic, and ceremonial uses.
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Candle emissions: Candles emit volatile organic compounds, including carbon
The use of candles dates back to around 3,000 B.C. in ancient Egypt. They have been made from various materials, including papyrus reeds, animal fat, tallow, beeswax, and spermaceti. Today, candles are typically made from wax, a wick, and a fragrance.
Candles emit volatile organic compounds (VOCs) when lit, including both pleasant aromas and toxic components. VOCs are organic chemical compounds that can evaporate under normal indoor atmospheric conditions of temperature and pressure. They are defined as any compound of carbon, excluding carbon monoxide, carbon dioxide, carbonic acid, metallic carbides, carbonates, and ammonium carbonate. The higher the volatility (lower the boiling point), the more likely a compound will be emitted from a product or surface into the air.
Candles emit typical combustion gases such as carbon monoxide, carbon dioxide, and NOx, as well as organic compounds like formaldehyde, benzene, and polycyclic aromatic hydrocarbons. A study found that scented paraffin candles release toxic chemicals such as toluene, a benzene derivative and known human carcinogen, when burned. However, another study in the Journal of Regulatory Toxicology and Pharmacology found that scented paraffin candles do not pose any health risks when used normally, as the highest estimated emission levels for fragrances, formaldehyde, and benzene were below the air quality exposure limits set by the World Health Organization.
The emission profiles of scented and unscented candles differ significantly. Scented candles tend to show increased concentrations of low-boiling-point compounds, and certain products act as potent sources of VOC emissions regardless of whether they are lit or unlit.
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Candle alternatives: Non-toxic candles are an alternative to prevent the release of harmful compounds
Candles are made up of three essential components: the wick, wax, and fragrance. While candles are a great way to relax and transport us from the comfort of our homes to idyllic getaways, there is growing concern about the potential health risks associated with burning conventional candles.
The controversy surrounding candle toxicity is not new. It started back in 2001 when the Environmental Protection Agency released a report identifying candles and incense as potential sources of indoor air pollution. The report highlighted the release of volatile organic compounds (VOCs), including formaldehyde, during the burning of candles.
One of the most common wax forms, paraffin, is derived from petroleum oil. A study conducted at South Carolina State University found that the combustion process of paraffin candles releases toxic chemicals such as toluene, a benzene derivative, and known carcinogen. Researchers suggested that frequent use of these candles could lead to "dangerous pollutants drifting in the air," which can be harmful when inhaled.
However, the safety of paraffin wax has been supported by other studies, including one published in the Journal of Regulatory Toxicology and Pharmacology. This particular study found that scented paraffin candles did not pose any health risks when used under normal conditions, as the estimated emission levels for fragrances, formaldehyde, and benzene were well below the air quality exposure limits set by the World Health Organization.
Despite the contradictory evidence, non-toxic candles made from natural materials like soy, beeswax, and coconut wax offer a healthier and eco-friendly alternative to conventional candles. These candles provide a cleaner burn and fewer harmful byproducts. Beeswax, in particular, has a longer burn time and purifies the air, making it a top choice for non-toxic options.
To ensure a safe and beneficial experience, look for brands that use 100% essential oils for fragrance and incorporate sustainable materials. Additionally, opt for candles with wicks made from natural materials like cotton, hemp, or wood, which are clean-burning and free of harmful ingredients. By making these conscious choices, you can enjoy the ambiance of candles while reducing potential health risks and environmental impact.
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Frequently asked questions
No, candles do not have cells. The definition of life distinguishes life from other processes, such as the burning of a candle, in which orderly structures are generated but without the same type of link between the peculiarities of parents and the peculiarities of offspring.
Candles are made up of three essential components: the wick, wax, and sometimes fragrance.
Candle wicks can be made from a variety of materials, including cotton, paper, and zinc or zinc alloy.
Candle waxes are made from hydrocarbons, which are largely composed of hydrogen and carbon atoms. Examples of candle waxes include paraffin, soy, coconut, beeswax, apricot, and vegetable waxes.
