Jessie Taylor
Candles are a popular way to create a cosy atmosphere, but they can also be a fire hazard. They are made of wax, usually paraffin, and have a wick that is lit to produce a flame. The heat from the flame causes the wax to melt and evaporate, and it is this wax vapour that burns and produces light. Over time, candles can lose their colour and scent, and their wicks can become clogged, making them difficult to light. While they do not have a hard expiration date, they certainly degrade and can become unsafe to burn. To ensure safety, it is important to never leave a burning candle unattended, keep it on a stable, heat-resistant surface, and ensure it is extinguished properly.
| Characteristics | Values |
|---|---|
| Burn time | Depends on the size of the candle, the type of wax, the number of wicks, and the size of the wick |
| Self-extinguishing | Candles in jars or containers with a wick that comes from a metal bottom can self-extinguish |
| Degradation | Candles degrade over time, with scent degradation being the first type of degradation to occur |
| Expiration | Candles don't have a hard expiration date, but they can lose their colour and scent over time |
| Fire hazards | Research shows that an estimated 8,200 home fires each year are started by candles |
| Fire safety | Place candles on a stable, heat-resistant, flat surface away from flammable objects; trim the wick regularly; use a candle snuffer to extinguish |
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What You'll Learn
Candles don't expire, but they degrade over time
Candles don't have an expiry date, but they do degrade over time. This means that they won't simply become unusable after a certain date, but their quality will gradually decrease.
The first type of degradation to occur in a candle is usually scent degradation. This is when an unlit candle gradually loses its original fragrance. This happens because fragrance oil molecules slowly evaporate from the wax into the air, even when the candle isn't burning. Scent degradation occurs very gradually and is almost unnoticeable for the first 6 months to a year, depending on the type of wax and the quality of the fragrance oils used.
Over time, candles may also experience colour degradation and become more difficult to light. Organic, vegetable-based waxes like soy and coconut are more prone to breaking down over time, which can cause the wick to become clogged. On the other hand, paraffin and beeswax candles are more stable and can last almost indefinitely if stored correctly.
To make your candles last longer, it's important to take proper care of them. This includes trimming the wick regularly, placing the candle on a stable, heat-resistant surface, and ensuring proper burn times. Additionally, choosing the right type of wick and storing the candle correctly can also help extend its lifespan.
While candles don't technically expire, they are best used within the first 6 months to a year of purchase. During this period, you can expect the candle to burn properly, emit fragrance, and maintain its original colour. However, with proper care and storage, some candles can last much longer.
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Scented candles lose fragrance as molecules evaporate
Scented candles are crafted with essential oils, which are volatile by nature, meaning they evaporate easily when exposed to air. This is a gradual process, and the rate at which it occurs depends on the type of wax and oil used, as well as the storage conditions of the candle.
The molecules responsible for the scent in candles are derived from plant materials such as flowers, fruits, bark, and leaves. These oils are complex mixtures of chemical compounds, each contributing to the candle's overall scent profile. For example, lavender oil contains linalool and linalyl acetate, which give it its floral aroma.
The choice of wax plays a crucial role in scent retention. High-quality waxes like soy wax and beeswax have superior scent-holding capabilities, allowing for a more prolonged and even distribution of fragrance. On the other hand, low-quality paraffin wax may experience faster scent evaporation due to its higher melting temperature and inferior scent retention properties.
The quality of the fragrance oil also matters. High-quality oils maintain their strength for longer, while cheaper oils may evaporate or lose potency more quickly. Natural fragrances also tend to degrade faster than synthetic ones. Heat, light, and humidity can further cause fragrance oils to degrade, as can exposure to UV rays, similar to how a perfume's scent fades when left in sunlight.
To prolong the lifespan of a candle's fragrance, proper storage is essential. Candles should be stored in a cool, dry place away from direct sunlight and sources of heat. For candles with lids, keep them covered when not in use to prevent air exposure, which weakens the fragrance over time. For candles without lids, consider storing them in an airtight container in a shaded area.
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Paraffin wax candles are more stable and long-lasting
Candles do not have a hard expiration date, but they do degrade over time. The type of wax used and how the candle is stored are the two main factors that determine a candle's lifetime. Paraffin wax candles are more stable and long-lasting than other types of wax candles.
Paraffin wax is derived from the oil industry's by-products, making it inexpensive and widely available. It is the most common type of candle wax and is used by many candle brands due to its ability to retain fragrance and colour. Paraffin wax candles also have various melting points, making them suitable for creating container candles or thick pillars.
However, paraffin wax is not the most eco-friendly option. Burning paraffin wax releases potentially harmful chemicals such as volatile organic compounds (VOCs) and phthalates, which can cause health issues such as headaches, shortness of breath, and coughing. It also produces more soot, which can leave unsightly black marks on candle holders.
Despite these concerns, paraffin wax candles can last almost indefinitely if stored correctly. To prolong the life of your paraffin wax candle, it is recommended to place it on a stable, heat-resistant surface and regularly trim the wick to prevent excessive burning and promote an even melt.
In summary, while paraffin wax candles may have some negative environmental and health impacts, they are more stable and long-lasting than other types of wax candles when properly maintained.
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Fire safety: trim wicks, use candle snuffers, avoid draughts
Candles are a great way to create a tranquil and beautiful ambiance in your home, but it's important to remember that they are an open flame and a potential fire hazard if not carefully monitored. To ensure fire safety when using candles, follow these essential tips:
Trim Wicks
Before lighting a candle, always trim the wick to a length of 1/4 inch. Long or crooked wicks can cause uneven burning, dripping, or flaring, which can increase the risk of fire hazards. Use a wick trimmer, nail clippers, or scissors to achieve the correct length.
Use Candle Snuffers
When you're finished enjoying your candle, it's important to properly extinguish the flame. Using a candle snuffer can help you safely put out the flame without the risk of hot wax spilling or the wick continuing to smolder. A candle snuffer also helps prevent the buildup of smoke and soot that can occur when you blow out a candle.
Avoid Draughts
Keep candles away from drafts, vents, or air currents. These can cause rapid or uneven burning, sooting, and excessive dripping. Place candles in a draft-free area to ensure a steady and controlled flame. Additionally, ensure that burning candles are placed at least three inches apart to prevent them from creating their own drafts or melting one another.
Other Important Fire Safety Tips
- Never leave a burning candle unattended.
- Never burn a candle near anything flammable or that could catch fire.
- Keep candles out of the reach of children and pets.
- Don't touch or move a candle while it is burning or the wax is liquefied.
- Discontinue burning a candle when 1/2 inch of wax remains in the container or 2 inches for a pillar candle.
- Extinguish the candle if the flame becomes too high or flickers repeatedly.
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Burning candles release carbon dioxide and water vapour
Candles are a wonderful addition to any home, but they can also be a fire hazard and a source of indoor air pollution. When a candle burns, the heat of the flame vaporises the liquid wax, turning it into hot gas. The hydrocarbons in the wax break down into molecules of hydrogen and carbon. These molecules are drawn into the flame, where they react with oxygen from the air to produce heat, light, water vapour, and carbon dioxide.
The amount of carbon dioxide and water vapour produced by a candle is relatively small, comparable to the amount exhaled by another person in the room. However, if candles are burned frequently, it is important to take steps to minimise exposure to airborne particles. Ensuring the room is well-ventilated and using clean, white candles with fewer additives can help reduce indoor air pollution.
The wax used in candles can also affect their burn time and safety. Organic, vegetable-based waxes like soy and coconut are more prone to degradation over time, which can make the wick difficult to light. On the other hand, paraffin and beeswax candles are more stable and can last longer if stored correctly. Additionally, candles with self-extinguishing wicks, such as those made from zinc or tin, are safer as they increase the likelihood of the candle going out on its own.
To maintain fire safety, it is important to place candles on a stable, heat-resistant surface and trim the wicks regularly to prevent excessive burning. Choosing an appropriate burn time and keeping candles away from flammable objects can also help reduce the risk of accidents. By following these simple steps, individuals can safely enjoy the soft glow and ambient pleasure of burning candles in their homes.
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Frequently asked questions
Yes, candles do run out. The wax is the fuel and it is burnt up and smoked away.
Candles don't have a hard expiration date, but they do degrade over time. The burn time of a candle depends on the size of the candle, the type of wax, the number of wicks, and the size of the wick. For example, a standard 12 oz candle has an average burn time of 80 hours.
To make your candles last longer, you should trim the wick regularly to prevent excessive burning and keep the wick between an eighth and a quarter of an inch long. You should also place your candle on a stable, heat-resistant surface and ensure it is away from draughts and flammable objects.
While candles don't have a hard expiration date, they do degrade over time. Scent degradation is the first type of degradation to occur in a candle. This happens when molecules of fragrance oil evaporate from the wax into the air, even when the candle isn't burning.
