
Candles are made from wax, typically paraffin wax, and a wick, usually made from cotton. When a candle is lit, the heat from the flame melts the wax, which then evaporates and reaches its ignition temperature, keeping the candle burning. The liquid wax is drawn up through the wick by capillary action and burns when it reaches the flame. The combustion of the candle is self-sustaining, with the heat from the flame melting the top layer of wax, which is then burnt, and the process continues until the fuel is used up or the heat source is removed. The melted wax can be reused to make new candles or wax melts.
| Characteristics | Values |
|---|---|
| Reason for wax melting | Heat from the flame |
| What happens to the wax when it melts | It vaporizes and combines with oxygen in the air to form a flame |
| What happens to the wax that doesn't burn | It drips down and solidifies again once the temperature drops |
| What is the flame | A combination of carbon dioxide, water vapour, and other gases |
| How to melt leftover candle wax | In the oven, microwave, or using the double boiler method |
| How to reuse melted candle wax | Make fire starters, wax melts, votive candles, or scented sachets |
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What You'll Learn

How to melt candle wax at home
There are several ways to melt candle wax at home, including using a double boiler, a microwave, or an oven. Here is a step-by-step guide on how to melt candle wax at home using these different methods.
Double Boiler Method:
- Fill a large pan halfway with water and heat it gently on your stove.
- Place your wax into a small bowl and carefully put it inside the large pan, ensuring the water does not get into the wax.
- Heat the wax over medium heat until it reaches 80°C. You can use a thermometer to monitor the temperature.
- If adding colour, do so when the wax reaches 70°C. Sprinkle in the colour as desired.
- Remove the wax from the heat and let it cool to 65°C.
- Add your chosen essential or fragrance oils and gently stir for about a minute.
- Pour the wax into your chosen candle container and let it set.
Microwave Method:
- Place your wax in a microwave-safe container, preferably ceramic or glass.
- Heat the wax in the microwave for one minute at a time until it reaches 80°C. Use a thermometer to check the temperature.
- Remove the container from the microwave and place it on a safe, even, heatproof surface.
- Add colour and fragrance/essential oils to the wax when it cools to 70°C and stir well.
- Pour the wax into your candle container.
Oven Method:
- Preheat your oven to its lowest temperature setting.
- Remove any labels or stickers from the wax container.
- Place the container with wax into the oven and allow it to melt.
- Once melted, scoop out the wax and reuse it as needed.
It is important to always be cautious when working with heat and never leave any equipment unattended to prevent accidents and overheating. Additionally, ensure that you do not exceed 80°C when melting candle wax, and if using soy wax, consider using a Presto Pot or a double boiler for better temperature control.
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The science behind candles
Candles have fascinated scientists for hundreds of years. In 1860, Michael Faraday gave a lecture series on the "Chemical History of a Candle", demonstrating dozens of scientific principles through careful observation.
When you light a candle, the heat of the flame melts the wax near the wick. This liquid wax is drawn up the wick by capillary action. The flame then vaporizes the wax, turning it into a hot gas. The vaporized molecules are drawn up into the flame, where they react with oxygen from the air to create heat, light, water vapour, and carbon dioxide. This combustion process continues until the fuel is used up or the heat is eliminated.
The blue area at the base of the flame is where the hydrocarbon molecules vaporize and break apart into hydrogen and carbon atoms. The hydrogen reacts with oxygen to form water vapour, while some of the carbon burns to form carbon dioxide. Above this is a small dark orange-brown section, where there is relatively little oxygen. Here, different forms of carbon continue to break down and form hardened carbon particles. As these particles rise, they are heated to approximately 1000 degrees Celsius.
At the bottom of the yellow zone, the formation of carbon (soot) particles increases. As they continue to rise, they heat up and emit visible light. The yellow portion of the spectrum is the most dominant when the carbon ignites, which is why the human eye perceives the flame as yellowish. When the soot particles oxidize near the top of the flame, the temperature rises to approximately 1200 degrees Celsius.
While candles are a beautiful source of light and fragrance, it is important to be mindful of the health risks associated with their use. Constant exposure to the particles released by burning candles can lead to cardiovascular and respiratory diseases. Therefore, it is recommended to ensure proper ventilation and use clean, white candles with minimal additives when burning candles regularly.
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How to reuse candle wax
Candle wax can be reused in a variety of ways, from adding it to a candle warmer to making fire starters, wax melts, votive candles, or scented sachets. Here are some detailed instructions on how to reuse candle wax:
Melting the Wax
First, you will need to melt the wax. If you are reusing the wax from a jarred candle, you can melt it in the oven. Preheat the oven to its lowest setting and place the jar inside, removing any labels or stickers first. Once the wax is melted, scoop it out with a spoon or similar utensil. Alternatively, you can melt the wax by placing the jar in the freezer. This will cause the wax to shrink and pop out of the jar. You can also melt the wax by placing the candle in a small pot and then placing that pot inside a larger pot filled with simmering water. Different types of wax have different melting points, so the time it takes to melt will vary.
Removing the Old Wick
Once the wax is melted, use tongs to remove and dispose of any old wicks.
Combining Wax from Multiple Candles
If you are combining the remnants of several candles, ensure that they are all the same type of wax.
Making Votive Candles
To make your own votive candles, cut a piece of wicking from the craft store that is 2 inches taller than your votive holder. Knot one end and thread the other end through a wick tab (also available at craft stores). Tie the free end of the wick around a wooden skewer. Dip the wick and tab into the melted wax to coat them, then remove and press the tab to the bottom of the holder. Rest the skewer on the rim of the votive holder and pour in the melted wax, stopping 1/2 inch below the rim. Allow the wax to set for about an hour. To even out the well at the centre, pour in more wax until it is 1/4 inch below the rim.
Alternative Votive Holder
Instead of a plain votive holder, you can pour your melted wax over a new wick nestled in a vintage teacup.
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Different types of wax
The type of wax used for a candle affects everything from its appearance and fragrance to its burn time and environmental impact. Here is a list of some of the most common types of candle wax and their unique properties:
Paraffin Wax
Paraffin wax is one of the most popular types of candle wax, especially for highly scented candles. It is derived from petroleum, making it widely available and affordable. It has a medium melting temperature, making it easy to work with, and it burns consistently, providing a reliable base for candles of various shapes and sizes. However, it does not burn as cleanly as other waxes and can produce soot and other chemicals.
Soy Wax
Soy wax is a vegetable-based wax made from soybeans. It is a popular choice for container candles due to its slow, steady, and even burn, extended burn time, and great scent throw. It is also more eco-friendly than paraffin wax, although there are some concerns about the soybean industry's use of deforestation, fertilisers, and pesticides.
Beeswax
Beeswax has been used for candles for centuries and is known for its long burn time and warm-toned, smoke-free flame. It is more expensive than other types of wax due to its natural production and popularity. While it is of higher quality, it may not be the best option for beginners due to its higher price point.
Coconut Wax
Coconut wax is a newer option that is becoming increasingly popular. It is harvested from coconuts, a high-yield and sustainable crop. It burns slowly and cleanly with minimal soot, and it holds fragrance and colour well. It is also soft and has a low melting point, making it suitable for blending with other waxes such as beeswax or soy.
Rapeseed Wax
Rapeseed wax is a natural, renewable wax derived from the seeds of the rapeseed plant. It is a good choice for those seeking an environmentally friendly option as it is sustainable, vegan-friendly, and burns cleanly with minimal soot production. It is also compatible with essential oils and natural fragrances, making it ideal for organic, eco-conscious candle products. However, it is more expensive due to the rigorous sourcing and extraction process.
Palm Wax
Palm wax is a natural wax that creates stunning crystalline and feathered textures, making it ideal for decorative freestanding candles like pillars. It burns slowly and cleanly, but its contribution to the deforestation of palm trees is a concern for some.
Gel Wax
Gel wax is a synthetic wax that is translucent and often used for novelty or artistic candles with embedded objects or unique visual effects. It has a higher melting point than wax candles, allowing it to burn for longer. However, it has a propensity to overheat, which can cause thin glass vessels to crack or break, and it is not natural or biodegradable.
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How to make your own candles
Making your own candles is a fun and therapeutic activity. It's also a great way to save money, create a cosy ambiance, and add a natural scent to your home. Here's a step-by-step guide on how to make your own candles at home:
Prepare Your Materials
To make your own candles, you'll need the following materials: jars or containers, wax (such as soy wax or beeswax), wicks, a pot, a stove or slow cooker, and optional ingredients like essential oils or fragrance oils for scent. You can easily find wicks and other candle-making kits in craft stores or online. If you want to add colour to your candles, you can use candle dye or crayons.
Melt the Wax
Measure out the desired amount of wax pellets or chunks and place them in a melting pot or glass bowl. Create a double boiler by filling a larger pot halfway with water and placing the melting pot inside. Heat the water over medium heat to melt the wax gradually and prevent overheating. Alternatively, you can melt the wax in an oven by preheating it to a low temperature and placing the wax in an oven-safe container. Always be cautious when handling hot wax to avoid burns.
Prepare the Container
While the wax is melting, prepare your container by securing a wick in the centre. Cut the wick about 2 inches taller than the container, and use a wick tab to hold it in place. You can also add essential oils or fragrances to the melted wax at this point, stirring gently to combine.
Pour and Set
Once the wax is completely melted, carefully pour it into your prepared container, stopping about half an inch below the rim. Let the candle stand until it sets, which typically takes about an hour. If needed, pour a small amount of additional wax into the centre to create an even surface.
Finishing Touches
After the candle has hardened, trim the wick to the desired length, and your candle is ready to use! You can decorate your candle with dried flowers, glitter, or other embellishments. Remember to burn your candle in a well-ventilated area and always follow basic candle safety guidelines.
Making your own candles is a rewarding and creative process. You can experiment with different waxes, scents, and colours to create unique and personalised candles for yourself or as gifts for loved ones. Enjoy the warm glow and delightful aromas of your handmade creations!
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Frequently asked questions
When you light a candle, the heat from the flame melts the wax, which then flows up the wick and evaporates. The liquid wax reaches its ignition temperature and the wax vapour burns, keeping the candle burning.
When a candle burns, the wax combines with oxygen in the air to form a flame, producing carbon dioxide and water vapour. The carbon dioxide and water vapour cool and mix into the room, becoming indistinguishable from other molecules.
Candles are mainly made from paraffin wax, a byproduct of petroleum refining. They can also be made from beeswax, microcrystalline wax, gel, or plant waxes such as palm, carnauba, bayberry, or soybean wax.
There are a few ways to melt candle wax at home. One way is to use the double boiler method, placing the jar in water until the wax liquifies. Another way is to use an oven, by preheating it to the lowest setting and placing the jar inside. You can also melt candle wax in the microwave, but be cautious as the container may not be microwave-safe.











































