Chloe Adams
A candle is a solid wax-based product that is ignited to provide light, heat, or fragrance. While candles are typically made of solid wax, there are liquid candles available on the market. These liquid candles, also known as refillable candles, burn a real flame but never melt down, providing an economical and mess-free alternative to traditional solid wax candles. The question of whether a candle counts as a liquid arises, especially in the context of travel regulations, where gel candles and liquid-filled candles are often treated differently from solid candles due to safety concerns. In the following paragraphs, we will explore the nature of candles, including their historical usage, production methods, and the distinction between solid and liquid candles, to provide a comprehensive understanding of this illuminating topic.
| Characteristics | Values |
|---|---|
| Definition | A candle is an ignitable wick embedded in wax or another flammable solid substance such as tallow that provides light, heat, or a method of keeping time. |
| Composition | Common wax types include paraffin, beeswax, and soy. |
| Production | Traditional methods involve melting the solid fuel by applying heat. The liquid is then poured into a mould, or a wick is repeatedly immersed in the liquid to create a dipped tapered candle. |
| Viscosity | The wax's ability to resist movement when melted. |
| Scent Load | The ratio of fragrance oil to the weight of wax. |
| Melt Point | The temperature at which the wax turns from a solid state to a liquid form. |
| Melt Pool | The liquid pool of wax in a candle while burning. |
| Liquid Candles | Refillable liquid candles burn a real flame but never melt down. |
| TSA Rules | Gel candles and liquid-filled candles are usually not allowed in carry-ons due to flammability concerns. |
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What You'll Learn
Liquid candles
A candle is an ignitable wick embedded in wax or another flammable solid substance. When a candle burns, the heat melts a small amount of solid fuel (the wax), which turns into a liquid and then a vapour (gas) that ignites to form a flame. The liquid wax is drawn up through the wick and combusts, creating heat, light, water vapour, and carbon dioxide.
The process of making traditional wax candles involves melting the solid wax, which is then poured into a mould or used to coat a wick through a dipping or rolling process. The melt point refers to the temperature at which the wax transitions from a solid to a liquid state. The pour temperature is the required temperature for pouring the liquid wax into the vessel, and the mix temperature is the recommended temperature for adding fragrance and colour. The scent load or fragrance load is the ratio of fragrance oil to the weight of the wax, and it is important to ensure that the correct type and size of wick are used.
When a candle burns, the flame's appearance can be divided into several zones. The blue zone at the base is where the hydrocarbon molecules vaporize and break down into hydrogen and carbon atoms. The hydrogen reacts with oxygen to form water vapour, and some carbon burns to form carbon dioxide. The dark orange-brown region has less oxygen, and the carbon continues to break down into hardened particles. As these particles rise, they heat up to around 1000 degrees Celsius. At the bottom of the yellow zone, the formation of soot particles increases, and the flame reaches a temperature of approximately 1200 degrees Celsius. The fourth zone, sometimes called the veil, is the faint blue edge that extends from the base and up the sides of the flame, directly meeting the oxygen in the air. It is the hottest part of the flame, reaching temperatures of up to 1400 degrees Celsius.
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TSA rules for candles
The TSA's rules for travelling with candles depend on the type of candle you have and whether it is in your carry-on or checked luggage.
Solid candles, including wax, glass jar, and Yankee candles, are allowed in both carry-on and checked bags. However, it is recommended not to wrap the candle if it is in your carry-on bag, as security officers will need to inspect it. Additionally, if the candle is a gift, the TSA recommends travellers loosely wrap it so that it can be visually inspected after clearing the X-ray review. Solid candles should also be clearly labelled with their ingredients, stating that they are composed of soy wax, coconut wax, or another type of wax.
Gel-type candles, liquid candles, and candles containing oil are classified as liquids and must follow the same restrictions. On international flights, all containers of fluids should be less than or equal to 100 ml (3.4 oz) if packed in carry-on luggage. Therefore, gel candles that exceed 100 ml in volume should be placed in checked luggage. However, one source mentions that gel candles are allowed in checked luggage but are generally banned from carry-on luggage, while another source states that gel candles are not allowed on planes at all. It is important to note that gel candles have been known to cause fires and explosions, which is why they are on the airport security list of carry-on restricted items.
Sparkler cake candles are regarded as fireworks and are prohibited in both carry-on and checked luggage.
Battery-operated candles without batteries can be included in both carry-on and checked luggage. However, there have been concerns about batteries catching fire in suitcases, so it is recommended to carry candles with batteries in the carry-on baggage.
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Candle wax and heat
Candles are made of wax, a flammable solid substance, and a wick, which is a strip of porous material. When the wick of a candle is lit, the heat melts and ignites a small amount of wax, which then turns into a liquid and moves up through the wick. This liquid wax is drawn up into the flame, where it combines with oxygen in the air to create heat, light, water vapour, and carbon dioxide. The heat radiated from the flame melts more wax to keep the combustion process going until the fuel is used up or the heat source is removed.
The type of wax used in a candle affects the burn rate, with beeswax and coconut wax burning longer than paraffin or soy wax. The size of the flame and the corresponding rate of burning are also controlled by the candle wick. The diameter, stiffness, fire resistance, and tethering of the wick are important characteristics that influence how the candle burns.
In terms of candle-making, the melt point refers to the temperature at which the wax transitions from a solid to a liquid state. The mix temperature is the recommended temperature of the wax when adding fragrance and colour, while the pour temperature is the required temperature for pouring the liquid wax and fragrance into the vessel.
Liquid candles, such as those containing gel or liquid paraffin, are distinct from traditional solid wax candles. These liquid candles burn a real flame but do not melt down, making them everlasting and refillable. They are also known to be more economical and less messy than traditional wax candles.
When considering travel regulations, it is important to note that liquid-filled candles are typically not allowed in carry-on items due to safety concerns. However, solid wax candles are generally permitted in both carry-on and checked baggage.
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Candle production
While candles are solid, they are made from wax, which is a substance that changes from a solid to a liquid state when heated. This property of wax is what allows candles to melt and burn.
Step 1: Preparing the Wick
The first step is to prepare the cotton or linen wicks by braiding and treating them with chemicals. This treatment allows the wicks to bend at a 90-degree angle when burning.
Step 2: Melting the Wax
The wax, which can be made from various substances like paraffin, beeswax, soy, or tallow, is heated and melted into a clear, near-liquid state in large metal kettles. This liquid wax is carefully filtered to remove any impurities that may interfere with the burning process. Any desired perfumes, dyes, or fragrances are added at this stage.
Step 3: Pouring and Moulding
The molten wax is then cooled slightly above its melting point and poured into a moulding table, where it carefully fills each mould. An alternative method is to use extrusion, where the wax is forced through a heated steel die under extreme pressure, creating long wax cylinders.
Step 4: Cooling and Solidification
After pouring, the moulds are cooled by filling the jackets with cold water to speed up the solidification process. Once the wax has solidified, the candles are removed from the moulds, and the wicks are snipped and prepared for the next batch.
Step 5: Quality Control and Testing
Before candles can be sold, they undergo a quality control process to ensure they meet safety and quality standards. Testers measure flammability, burn time, and wick quality.
Step 6: Shipping and Retail
Candles are then packaged and shipped to retailers, who place them on shelves for consumers to purchase. The shipping process must be fast to prevent weather conditions from damaging the candles.
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Candle history
The history of candle-making spans thousands of years, from ancient civilizations like Egypt and Rome, where candles played a key role in lighting homes and ceremonies, to the present day, where they are often used for decoration and fragrance.
The ancient Romans are generally credited with developing wicked candles by dipping rolled papyrus repeatedly in melted tallow or beeswax. These candles were used for lighting their homes, aiding travellers at night, and in religious ceremonies. However, it is believed that the use of wicked candles may have originated in Italy during the Etruscan period, with a picture of a candlestick found in an Etruscan tomb dating back to the 7th century BC.
Other ancient civilizations also developed candles independently, using various materials available to them. For example, early Chinese candles were made by moulding wax from an indigenous insect combined with seeds in paper tubes, while in Japan, candles were crafted from wax extracted from tree nuts. In India, candle wax was produced by boiling the fruit of the cinnamon tree, and in Egypt, beeswax was used to create candles for their gods.
During the Middle Ages, beeswax candles were introduced in Europe, offering a cleaner and purer alternative to the smoky and foul-smelling tallow candles that were commonly used. By the 13th century, candlemaking had become a guild craft in England and France. The growth of the whaling industry in the late 18th century brought another significant change to candlemaking, with the introduction of spermaceti wax, which produced a brighter light and was harder than tallow or beeswax.
In the 19th century, large-scale industrial manufacturing techniques were introduced for the mass production of candles. However, with the advent of electric lighting, candle use declined, although they continue to be used for ambiance, decoration, and spiritual practices. Today, candles are made from a variety of waxes, including paraffin, beeswax, and soy, and are valued for their fragrance and design as much as their light.
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Frequently asked questions
No, a candle is not a liquid. It is a solid wax substance with an embedded wick that, when lit, melts and ignites a small amount of the wax, which then vaporizes and combines with oxygen to form a flame.
A liquid candle, also known as a refillable candle, is a type of candle that burns a real flame but never melts down. Instead of wax, it uses a liquid fuel that is drawn up through the wick and combusted.
Solid candles, such as birthday candles, votives, and tea lights, are typically allowed in both carry-on and checked baggage. However, gel candles and liquid-filled candles are usually prohibited in carry-on items due to flammability concerns and safety regulations. These types of candles must be placed in checked baggage.
