Brooke Martin
Soy wax candles are notorious for developing rough tops, which can be aesthetically unappealing to candle makers. This is caused by the polymorphic nature of soy wax, which forms crystals over time in response to temperature changes and the cooling process. Air bubbles can also cause issues, leading to cracks, sinkholes, and bumpy tops. To repair the tops of soy candles, you can remelt leftover wax and pour it slowly over the top of the candle to fill in any holes or imperfections. A heat gun or hair dryer can also be used to melt the surface of the candle and create a smooth top. To prevent rough tops, candle makers should aim for consistent temperatures and cooling processes, and gently stir the wax to minimise air bubbles.
When to repair the tops of soy candles
| Characteristics | Values |
|---|---|
| Temperature of the environment | The temperature of the environment impacts how the candle solidifies. |
| Temperature of the wax | The temperature at which the wax is poured influences the cooling process and the formation of crystals. |
| Air bubbles | Air bubbles can cause an uneven or bumpy top, as well as other issues such as cracks or sinkholes. |
| Crystallization | Soy wax is polymorphic, forming crystals over time in response to temperature changes. The structure of these crystals affects the smoothness of the candle's top. |
| Fragrance oils | Certain fragrance oils can cause holes and lumpy tops if not mixed well with the wax at the correct temperature. |
| Cooling process | An inconsistent or rapid cooling process can lead to a rough top as the wax solidifies at different rates. |
| Frosting | Frosting occurs when the pour temperature is too low, causing the wax on top to dry while the underneath is still warm. |
| Humidity and ambient temperature | Environmental factors such as humidity and ambient temperature can affect the formation of lumps or an uneven top. |
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What You'll Learn
Causes of rough tops on soy candles
Soy wax is polymorphic, meaning it crystallizes in response to temperature changes and time. The cooling process will determine whether these crystals appear smooth or rough. If the wax cools unevenly, too quickly, or too slowly, the candle's surface can become rough and bumpy. The temperature of the environment and the temperature at which the wax is poured will impact how the candle solidifies.
Trapped air within the wax rising to the surface may also cause an uneven or bumpy top. Air bubbles may also lead to other problems like cracks or sinkholes. Air can become trapped in soy wax during the manufacturing process. While the wax cools and sets, the air works its way to the top and is released. However, if the surface of the candle sets before all of the air has time to escape, it will get trapped in the candle. As the wax sets, the air pocket leaves a void in the candle, and the surface above the void will collapse.
Vigorous stirring can produce air bubbles in the melted soy wax that can lead to imperfections in the finished candles. To avoid this, gently stir the wax to prevent air bubbles from forming and gently tap the container to release air bubbles.
Some fragrance oils can also cause rough tops. Vanilla and some essential oils like lavender can be the culprits. It is recommended to test without fragrance to establish a baseline for knowing whether the cause of the rough tops is from the candle-making process or an additive.
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How to prevent rough tops on soy candles
Soy wax is polymorphic, meaning it crystallizes in response to temperature changes and time. The structure of these crystals can be influenced by temperature, air, and the cooling process. Ideally, this crystallization process will lead to the smooth tops you’re looking for, but that’s not always the case. These crystal structures can give off a rough, bumpy texture if conditions aren’t right.
To prevent rough tops on your soy candles, you can try the following:
- Preheat your containers to promote an even cooling process. Preheat containers in the oven at a low setting for 2-3 minutes or with a heat gun on the lowest setting.
- Space candles at least 4 inches apart while cooling so they don’t interfere with each other’s cooling process.
- Record your pour temperatures and the temperature of your candle-making environment. Start with the recommended pour temperature for the wax you’re using and adjust in +/- 5-degree increments.
- Avoid vigorous stirring, which can produce air bubbles in your melted soy wax that can lead to imperfections in the finished candles.
- Gently tap the container to release air bubbles.
- Pour slowly to prevent air bubbles from forming.
- Test cooling the candles on a rack. A cooling rack will prevent a solid surface from pulling heat from the candle and causing parts of the candle to cool faster than others.
- Try blending another wax with soy to help offset the common issues associated with 100% soy wax, like rough tops. Paraffin works great, but if you want to stay all-natural, you can blend soy with coconut or beeswax.
- Use the first strategy mentioned without any fragrance oils or dye to lock down the wax properties. Soy is fickle, but paraffin and coconut offer stability and resistance to some of soy’s problems.
- Try to pour as cool as possible (cloudy), but lightly stir as soon as you mix fragrance oil the entire time (without introducing air) until you pour.
- Try pouring at different temperatures to see how it impacts your candle. Try a pre-heated oven or a cool basement.
- Try using a heat gun to smooth out the top. Apply constant heat with a heat gun to the affected area, melting a depth of approximately 1/8″ across the effective width of the container. When you finish, allow the top to cool evenly in open air.
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How to fix rough tops on soy candles
Soy wax is polymorphic, meaning it crystallizes in response to temperature changes and time. The temperature of the environment and the temperature at which you pour the wax will impact how your candle solidifies. If the wax cools too quickly or too slowly, it can result in a rough, bumpy texture. This can also be caused by air bubbles that get trapped in the wax during the manufacturing process.
To prevent this from happening, you can preheat your containers and space out your candles while they cool. You should also record your pour temperatures and the temperature of your candle-making environment, adjusting in small increments until you find the right temperature for your environment.
If you want to get rid of an existing rough top on a candle, you can use a heat gun to melt the affected area and then allow the top to cool evenly in open air. You can also use leftover wax to fill in any holes and create a smooth top.
If you are selling candles with rough tops, you can educate your customers that this is a natural occurrence for soy candles and proof that you are using authentic soy wax.
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The impact of temperature on soy candles
Soy wax is polymorphic, meaning it responds to temperature changes by forming crystals. The temperature of the environment and the temperature at which the wax is poured will impact how the candle solidifies. The ideal temperature for pouring soy wax is between 120°F and 140°F, with some sources suggesting a range of 145°F-160°F. Pouring at too high a temperature can cause the wax to shrink and create unsightly holes or dips in the candle.
The structure of the crystals formed during the cooling process can be influenced by temperature, air, and the cooling rate. If the conditions are not ideal, the crystal structures can give the candle a rough, bumpy texture. This can happen if the wax cools too quickly or too slowly, or if it contains small air bubbles. The temperature at which the fragrance is added also matters. For soy wax, the ideal temperature for blending in fragrance oil is between 155°F and 165°F, or 50°F to 60°F above its melting point.
To prevent issues with the tops of soy candles, it is recommended to record the pour temperatures and the temperature of the candle-making environment. Preheating the containers and cooling the wax to the ideal temperature range before pouring can help achieve better candle quality. Stirring the wax too vigorously can produce air bubbles, which can lead to imperfections in the finished candles. Tapping the container gently after pouring can help any air bubbles escape to the top.
After a soy candle has been burned, the melted wax will cool and solidify inconsistently, often resulting in a rough top. This is a natural occurrence and is a sign that the candle is made of all-natural soy wax. The rough, bumpy tops are caused by the wax in the melt pool cooling and solidifying at an irregular rate. This is a feature of soy wax and is not a sign of incorrect candle-making.
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The impact of air bubbles on soy candles
Soy wax is polymorphic, meaning it crystallizes in response to temperature changes and time. As the wax cools and solidifies, it naturally begins to form solid crystals. Ideally, these crystals are uniform, giving the wax a smooth, creamy appearance. However, if the wax cools too quickly or too slowly, or contains small air bubbles, the surface of the wax will have a rough, bumpy, or pitted finish.
Air bubbles can become trapped in the wax during the manufacturing process when the soybean oil is constantly stirred and agitated, allowing air into the oil. This trapped air can then be released when the wax is melted down for candle-making, resulting in visible bubbles rolling to the surface or audible popping sounds. While gentle stirring can help release trapped air, vigorous or brisk stirring can introduce air bubbles into the melted wax, leading to imperfections in the finished candles.
To prevent air bubbles from causing issues, it is recommended to gently tap the sides of the containers right after pouring to help any air bubbles escape to the top. Additionally, maintaining a consistent temperature during the candle-making process is crucial. The temperature of the environment and the temperature at which the wax is poured can impact the formation of air bubbles and the overall quality of the candle. By adjusting the pour temperature in small increments, you can find the optimal temperature for your workspace and promote even cooling, reducing the likelihood of imperfections.
If air bubbles do occur, they can be remedied by re-melting leftover wax to your pouring temperature and slowly pouring it over the top of the candle to fill in any holes or imperfections. Poke the sinkhole with a skewer a few times to release any remaining trapped air bubbles. Alternatively, a heat gun can be used to melt the surface and fill in any imperfections.
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Frequently asked questions
Soy wax is polymorphic, meaning it crystallizes in response to temperature changes and time. When the wax cools too quickly, too slowly, or contains small air bubbles, the surface of the wax will have a rough, bumpy, or pitted finish.
To prevent rough tops, you can adjust the pour temperature, gently stir the wax when adding fragrance, and pour the wax slowly into the vessels to reduce possible air bubbles. You can also preheat your containers and space out your candles during the cooling process.
You can repair the tops of your soy candles by remelting leftover wax and pouring a thin layer over the top of the candle to fill in any holes or imperfections. You can also use a heat gun or hair dryer to melt and smooth out the surface of the candle.
