Jessie Taylor
Candles have been used for light, heat, and timekeeping since 3000 B.C. They are made from wax, tallow, and natural fats, with wicks in the middle that produce light when lit. The combustion of a candle is self-sustaining, with the heat of the flame melting and igniting the wax, which then vaporizes and combines with oxygen to form a flame. The flame melts the top of the wax, which moves upward through the wick to be continuously burned, maintaining a constant flame. The colour of a candle flame is typically yellow, with a blue base and a small dark orange-brown section. The blue zone is oxygen-rich, where hydrocarbon molecules vaporize and break apart into hydrogen and carbon atoms. The dark orange-brown region has relatively little oxygen and is where carbon particles start to form and rise. The use of candles holds cultural and religious significance, especially in Christianity and Catholicism, where they are used for Mass, processions, and to show reverence.
| Characteristics | Values |
|---|---|
| Light produced | 13 lumens |
| Luminous efficacy | 0.16 lumens per watt |
| Burn rate | 0.1 g/min |
| Heat released | 80 W |
| Composition | Wax, tallow, natural fat, beeswax, resin, mineral oil, soy wax, etc. |
| Variants | Gel candles, LED candles, candle bulbs |
| Use cases | Lighting, decoration, ambiance, religious ceremonies |
| Safety concerns | Glass candle holders may crack, toxic fumes, flammable |
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Candle colour
Candles have been a source of fascination for centuries, with scientists like Michael Faraday giving lectures on the chemical history of candles as early as 1860. The warm glow of a candle is created through a combustion process that releases light, heat, carbon dioxide, and water vapour. The colour of this light depends on the type of candle and the materials used.
Traditional wax candles, for example, produce a soft, yellow-orange flame. The colour of the flame is influenced by the wick, which is embedded in the wax and can be made from a variety of materials, including cotton, wood, or zinc. The wax itself can also impact the colour and brightness of the flame. For example, gel candles, made from a combination of resin and mineral oil, burn brighter and longer than traditional wax candles and have a clear appearance that showcases any added decorative elements like dried flowers or berries. Soy wax candles, on the other hand, burn cleanly and naturally, providing a soft, cosy light.
The colour of candlelight can also be influenced by the container or holder it is placed in. Glass candle holders, for example, can be susceptible to thermal shock, causing cracks in the glass as the candle burns down. Additionally, the shape of the candle and the presence of additives or fragrances can impact the colour and quality of the light produced.
In recent times, LED candles have become a popular alternative to traditional flames. These candles use small light bulbs or LEDs to mimic the look of a real candle flame without the fire risk. LED candles come in a variety of colours and styles, including white LED candles that closely resemble the look of real candles. They are often made from heat-resistant thermal plastic or glass and can be used safely in various settings, including decorative displays and outdoor environments.
Whether it's the warm glow of a traditional wax candle or the modern convenience of an LED alternative, the colour and light of candles continue to evoke a sense of comfort and ambiance, making them a popular choice for creating a cosy atmosphere.
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Candle composition
Candles are composed of a wick surrounded by wax, a solid fuel that melts when heated. The wick is lit, and the heat melts and ignites the wax, which then vaporizes and combines with oxygen in the air to form a flame. This flame then melts the top of the wax, which moves upward through the wick and is continually burned, maintaining a constant flame. As the wax is consumed, the candle and wick shorten.
The earliest candles were made by the Ancient Egyptians, who created torches by dipping papyrus reeds in animal fat and lighting them. The Ancient Romans developed this process by dipping wicks into tallow, a rendered form of animal fat. Other early candles were made from plant materials, like nuts and seeds, dipped in animal fat. Beeswax was introduced to candle-making in the Middle Ages in Europe, though it was rarely used in homes due to its expense. Beeswax candles were luxury items, and oil lamps were more commonly used for light. In the 18th century, the whaling industry brought about the use of spermaceti, an oil sourced from the heads of sperm whales, as a clean-burning, low-odor wax.
Today, paraffin is the most commonly used candle wax, though beeswax, soy wax, palm wax, gels, and synthesized waxes are also used. All candle waxes are primarily hydrocarbons, whether of animal, vegetable, or petroleum origin. They burn with a yellow flame due to the presence of carbon.
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Candle usage
Candles have been used for over two millennia and were once a significant form of indoor lighting. They are usually made from wax or tallow and contain a wick that may be burned to give light, heat, or scent. They can also be used for celebration or votive purposes.
The combustion process of lighting a candle includes the release of light, heat, carbon dioxide, and water vapour, which fuels the flame. The heat of the flame melts the wax near the wick, which is then drawn up the wick by capillary action. The heat of the flame vaporizes the liquid wax, breaking down the hydrocarbons into molecules of hydrogen and carbon.
Candles come in various shapes, sizes, and colours, and can be displayed in different ways, such as in candlesticks, chandeliers, lanterns, or sconces. They are often used for functional, symbolic, and aesthetic purposes, as well as in specific cultural and religious settings. For example, they are commonly used in churches and have been used in Jewish and Christian festivals.
However, candle use can be unsafe if fragrances are inhaled at high doses, and glass candle holders may crack due to thermal shock. To address these issues, non-toxic candles and LED candles have been created as alternatives. LED candles are made from natural materials and use a small light bulb instead of a flame, making them safer and longer-lasting. They are also available in different colours, with white LED candles being widely preferred for their resemblance to real candles.
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Candle safety
Candles have been used for lighting and decorative purposes for centuries. While they can create a warm and cosy atmosphere, they can also pose a fire hazard if not handled properly. Here are some safety tips to follow when using candles:
Never leave a burning candle unattended
This is one of the most important rules when it comes to candle safety. Never leave a lit candle unattended, as it only takes a few seconds for a fire to start. Always ensure that you are in the room and keeping an eye on the candle when it is lit. If you need to leave the room or go to sleep, extinguish the candle.
Keep candles away from flammable objects
Always be mindful of the candle's proximity to flammable objects. Keep candles at least 12 inches away from anything that can burn, such as curtains, furniture, paper, or fabrics. This includes ensuring that the candle is not placed in a draft, as the flame could potentially ignite nearby objects.
Use appropriate candleholders
Always use a candleholder that is specifically designed for candle use. It should be heat-resistant, sturdy, and large enough to contain any drips or melted wax. Avoid using glass candleholders, as they can sometimes crack due to thermal shock from the candle flame, especially when the candle burns down to the end.
Trim the wick
Before lighting a candle, ensure that the wick is trimmed to a length of ¼ inch. Long or crooked wicks can cause uneven burning, dripping, or flaring. Keep the wax pool clear of wick trimmings, matches, and debris at all times.
Discontinue burning at a safe level of wax
Do not burn a candle all the way down. For container candles, discontinue burning when ½ inch of wax remains. For pillar candles, leave 2 inches of wax. This margin of safety helps prevent the candleholder from overheating and potential wax spillage.
Keep out of reach of children and pets
Candles should always be placed out of the reach of children and pets. Ensure that they cannot be knocked over easily and that curious hands or paws cannot come into contact with the flame or hot wax.
Consider LED candles
If you are concerned about the safety hazards of real candles, consider using LED or battery-operated flameless candles. These candles can look, smell, and feel like the real thing, without the risk of fire. They are made from natural materials, use no flame, and are safer to use in various environments, including during rain or power outages.
By following these safety guidelines, you can enjoy the beauty and ambiance of candles while minimizing the risk of fire and ensuring the safety of yourself, your loved ones, and your surroundings.
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Candle history
The use of candles dates back to antiquity, with various ancient civilisations developing candles using different materials. Candles are believed to have originated around 3,000 B.C. in ancient Egypt, where papyrus reeds dipped in animal fat were used as torches. Similarly, the ancient Romans created an early form of the candle by dipping wicks into tallow, a rendered form of animal fat. Other civilisations, including the Chinese, Japanese and Indians, also created candles using waxes made from plants, insects, seeds and nuts.
In the Middle Ages, candle-making became a craft in England and France, with chandlers travelling from house to house to make candles from kitchen fats. Beeswax candles were introduced to Europe during this period, offering a purer, cleaner-burning alternative to tallow candles, although they were more expensive and only the wealthy could afford to burn them in their homes.
By the 13th century, candle-making had become a guild craft, with French guilds documented as early as 1061. In the Middle East, beeswax was the dominant material used for candle-making, often imported from long distances. For example, candle makers in Egypt used beeswax from Tunis.
The first major change in candlemaking since the Middle Ages came in the late 18th century with the growth of the whaling industry, which brought about the discovery of spermaceti, a wax derived from sperm whale oil. Spermaceti did not produce a repugnant odour when burned and produced a brighter light compared to tallow or beeswax. It was also harder, making it more suitable for warm climates.
In the 19th century, large-scale industrial manufacturing techniques were introduced for the mass production of candles. However, with the arrival of electric lighting, candle use began to decline. Today, candles are still used, but primarily for decorative, symbolic and ceremonial purposes rather than as a primary source of light.
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Frequently asked questions
A lit candle is a stick-shaped piece of wax with a wick in the middle that produces light.
A candle flame has a blue base, a small dark orange-brown section above it, and a large yellow region at the top. The blue zone is oxygen-rich, the orange-brown zone has little oxygen, and the yellow zone is where carbon soot particles increase.
Lit candles are used for birthdays, religious celebrations, decoration, and to indicate that a pub is open and serving. They are also used in funerals and memorial services, and have a long history in the Catholic Church.
