Chloe Adams
Soy wax frosting is a common issue in candle-making, characterised by small snowflake-like crystals forming on the surface of the wax. While it is a natural and purely cosmetic issue that does not impact the candle's burn, it may be undesirable for aesthetic reasons. Unfortunately, soy wax will always be prone to frosting due to the nature of its composition. However, there are strategies to minimise its occurrence and reduce its appearance. This includes controlling the pouring temperature, adjusting the amount of stirring, utilising additives, and being mindful of temperature fluctuations during the curing process.
Characteristics and Values
| Characteristics | Values |
|---|---|
| Wax temperature | Soy wax should be heated to no more than 185° F, but temperatures may vary according to preference. |
| Pouring technique | Pour at a higher or lower temperature to reduce frosting. Stir less, and do not stir before pouring. |
| Curing process | Store candles at a consistent temperature for 1-2 weeks before selling or burning. |
| Fragrance | Add fragrance oils when the wax is off the heat source, at a temperature between 175-185° F. |
| Additives | A small amount of paraffin wax may reduce frosting. Mono- and diglycerides can improve surface finish. |
| Packaging | Use opaque or colourful containers to hide frosting. |
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What You'll Learn
Avoid temperature fluctuations during curing
Soy wax frosting is a common issue, and while it does not impact the performance of the candle, it can be unsightly. Frosting occurs when crystals form on the candle due to temperature changes. This can happen during the burning process, but it can also occur during the curing process.
The curing process is when the fragrance fully develops and the wax hardens. This process is crucial to the performance of the candle, and it is important to allow enough time for curing—at least 48 hours, but ideally 1-2 weeks. During this time, it is essential to avoid temperature fluctuations, which can impact the scent throw and overall quality of the candle.
To avoid temperature fluctuations during curing, the candles should be stored in a cool, dry place, away from direct sunlight and any sources of heat. The ideal curing temperature is consistent and cool, and the candles should be stored in airtight containers or plastic bags. This will ensure that the fragrance oils properly disperse throughout the candle and that the colour, if any, is evenly distributed.
Additionally, it is important to note that the temperature of the wax during the pouring process can impact the likelihood of frosting. Soy wax should be heated to no more than 185°F (85°C) before pouring, and the ideal pouring temperature is between 120°F and 140°F (49°C and 60°C). Allowing the wax to cool before pouring is essential, as pouring at too high a temperature can cause the wax to shrink and create holes or dips in the candle.
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Adjust pouring temperature
Candle frosting is a common issue with soy candles, and while it doesn't affect the candle's performance, you may want to minimise it for aesthetic reasons. This phenomenon occurs when the wax cools too quickly or inconsistently, causing crystals to form on the surface, resulting in a frosted appearance.
Adjusting the pouring temperature is one way to reduce frosting in soy candles. Soy wax is polymorphic, meaning it can form different crystal structures at varying temperatures. Therefore, finding the right pouring temperature can help your candles cool more evenly, reducing the likelihood of frosting.
The ideal pouring temperature for soy wax is generally considered to be no higher than 185°F (85°C-95°C). However, you may need to experiment with different temperatures to find the optimal range for your specific soy wax blend. Start by adjusting your pouring temperature by +/- 5° and observe the results. Keep notes on the temperature adjustments and their corresponding outcomes to help you determine the best pouring temperature for your candles.
Additionally, consider preheating your glass containers to reduce the speed and extent of frosting. You can easily preheat glass containers in a hot oven set to the lowest temperature, but be careful not to heat them above 40°C. Also, ensure that your candles cool down in a space with a consistent temperature of around 20-25°C and no drafts, as fluctuations can contribute to frosting.
While adjusting the pouring temperature can help minimise frosting, it may not entirely eliminate it. Soy wax is naturally prone to developing frosting over time, and some crystallisation is expected. However, by following these temperature adjustments and maintaining stable curing conditions, you can significantly reduce the appearance of frosting on your soy candles.
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Use a heat gun
Frosting is a common issue with soy candles, caused by the polymorphic nature of soy wax. This means that soy wax can form different crystal structures at varying temperatures, resulting in a frosted appearance on the outside of the candle. While frosting does not affect the performance of the candle, it can be undesirable from an aesthetic standpoint.
To remove frosting from a soy candle, you can use a heat gun. Here is a step-by-step guide on how to do this:
- Identify the areas of the candle where frosting has occurred. These will be the areas you will need to apply heat to with the heat gun.
- Hold the heat gun at a safe distance from the candle and direct the hot air towards the frosted areas. Be careful not to hold the heat gun too close to the candle to avoid overheating and damaging the wax.
- Apply heat to the frosted areas until the surface of the wax begins to melt. Ensure that you only melt the top layer of the wax, as you do not want to compromise the structural integrity of the candle.
- Once the desired area has been melted, turn off the heat gun and set it aside to cool down.
- Allow the candle to solidify again. In most cases, the wax will solidify without any frosting, resulting in a smooth finish.
It is important to note that using a heat gun to remove frosting is a temporary solution. Soy wax continues to harden and crystallize throughout its life, so frosting may reappear over time, especially if the candle is subjected to temperature fluctuations. To minimize the chances of frosting reoccurring, store your candles in a cool, dry place away from direct sunlight or heat sources, and try to maintain a consistent temperature in the storage area.
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Use opaque candle containers
If you want to hide frosting on your soy candles, using a darker or opaque container is a good option. Frosted glass, for instance, can be a good choice if you don't want to use an amber jar. There are thousands of options available if you go down this route.
While frosting is a natural occurrence in soy wax, it can be disappointing to see crystals form on your carefully crafted candles. This happens because the wax naturally forms crystalline structures as it cools and hardens. The crystals are also affected by temperature changes, so you may notice more crystals developing over time.
Using opaque candle containers is a simple way to disguise this effect. You can also get creative with packaging and colours, and inform your customers about what to expect from soy candles, so they know that frosting is normal and won't impact the candle's performance.
Additionally, if you want to reduce the visibility of frosting, you can try making your soy candles without colour, as adding colour makes the frosting more noticeable.
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Use additives
Candle frosting is a normal and expected side effect of using soy wax. This is because soy wax manufacturers often incorporate additives in their blends to help resist frosting.
If you are making your own candles, you can also add additives to stabilize your wax. However, if you are keen to keep your candles natural, you may want to try other methods first, such as adjusting the temperature.
Some additives that you can use to reduce frosting include stearic acid, which is good for improving glass adhesion and hardening wax, although it may not prevent frosting. You can also add a bit of paraffin wax to your mixture, as it has a more stable crystalline structure. There are also pre-blended mixtures on the market, such as IGI 6006, known to resist frosting.
Another option is to use a natural additive, mono- and diglycerides, which can help with surface finish and hardness. These are already found in soy wax but can also be made from any oil.
UV inhibitors are another tool to fight against degradation caused by oxygen and ultraviolet light.
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Frequently asked questions
Candle frosting is when you notice small snowflake-like crystals forming on the surface of the wax. This is more common in soy and other vegetable waxes.
Frosting occurs due to temperature fluctuations as the candle wax cools and cures. It is also affected by the pouring temperature and the amount of stirring that takes place as the wax cools.
To prevent frosting, avoid temperature fluctuations during the curing process. Cure candles for 1-2 weeks in a consistent temperature environment. Adjust your pouring temperature to no more than 185° F, and stir less during the cooling process.
While there is no way to permanently remove frosting, you can temporarily reduce its appearance by using a heat gun on the affected areas. Using opaque or colourful candle containers can also help hide the appearance of frosting.
Some possible additives to prevent frosting include paraffin wax, mono- and diglycerides, and stearic acid. However, it's important to note that the use of additives may be considered "cheating" or "dishonest" by some candle makers, and it's crucial to understand the composition of your wax before adding anything.
