
Candles can get mouldy, especially if they are made with natural ingredients or stored improperly. Soy candles, for example, are prone to mould if kept in a warm and humid environment, as this attracts fungus spores. This can cause respiratory problems such as sneezing, coughing, and difficulty breathing. To prevent mould, candles should be stored in cool, dry places, away from direct sunlight and other heat sources, and in sealed containers.
| Characteristics | Values |
|---|---|
| Types of candles that grow mold | Soy candles |
| Reasons for mold growth | Stored in a warm and humid environment |
| Effects of burning moldy candles | Respiratory problems like sneezing, coughing, and difficulty breathing |
| How to prevent mold growth | Store candles in a cool, dry, and sealed container away from direct sunlight |
| What to do if mold is detected | Throw away the candle |
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What You'll Learn

Soy candles are vulnerable to mold
Soy candles are a popular natural alternative to traditional paraffin wax candles. They are made from renewable resources, making them a more sustainable choice. Soy wax is derived from soybeans, which are a natural, biodegradable material. This means that soy candles do not release the same harmful chemicals as paraffin candles, such as toluene and benzene, which are known carcinogens.
However, one notable downside of soy candles is their vulnerability to mold. Soy candles can sometimes get moldy, particularly if they are stored improperly. When kept in a warm and humid environment, soy wax can attract fungus spores, leading to the growth of mold on the outside of the container as a grayish-black film. This not only looks unpleasant but also poses health risks. Moldy soy candles can cause respiratory issues such as sneezing, coughing, and even difficulty breathing.
To prevent mold from forming on your soy candles, it is crucial to store them correctly. Always keep them in a cool, dry place, away from direct sunlight, heat sources, and water. Sealed containers are ideal for storage as they protect the candles from moisture and dust. Additionally, inspect your soy candles regularly for any signs of mold or mildew before lighting them. If you notice any discoloration or a darker appearance, it is best to discard the candle to avoid potential negative reactions to the fumes produced by mold.
Proper candle burning techniques are also important. Trimming the wick to 1/4 inch before lighting and avoiding prolonged burning can help prevent the release of harmful chemicals. By following these precautions, you can enjoy the benefits of soy candles while minimizing the risk of mold growth and its associated health hazards.
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How to prevent mold on candles
Soy candles are natural alternatives to traditional paraffin wax candles. They are popular for their long burn time, clean-burning flame, and natural soybean wax construction. However, one of their downsides is that they can get moldy if stored improperly.
To prevent mold from forming on your soy candles, follow these steps:
Store in a Cool, Dry Place
Keep your soy candles in a cool environment to prevent the wax from melting or becoming brittle. Ensure the storage area is well-ventilated and dry to avoid any moisture buildup, which could promote mold growth.
Avoid Direct Sunlight and Other Heat Sources
Direct sunlight or heat sources can cause the soy wax to melt or become brittle. Store your candles in a location away from direct sunlight and any heat-generating appliances or fixtures. This will help maintain the integrity of the wax and prevent any discolouration.
Use Sealed Containers
When not in use, store your soy candles in sealed containers or airtight jars. This will not only protect them from dust and other contaminants but also help regulate the temperature and humidity levels, creating an optimal environment for long-term storage.
Regularly Inspect for Mold
Before lighting your soy candles, always inspect them for any signs of mold or mildew. Look out for discolouration, a darkening of the wax, or any unusual spots. If you notice any indications of mold, discard the candle immediately. It is important to prioritise your health and avoid the potential respiratory risks associated with burning moldy candles.
Choose the Right Storage Location
Ideal storage locations for soy candles include closets or drawers. These areas generally provide stable temperature conditions and protect the candles from direct sunlight exposure. Ensure that the storage area is clean and free from any moisture or water sources that could create a favourable environment for mold growth.
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What to do if you spot mold on candles
Although it is uncommon, candles can grow mould under certain conditions, especially if they are made with natural ingredients or stored improperly. If you spot mould on your candles, here are some steps you can take:
Inspect the candle
Before taking any action, carefully inspect the candle for any signs of mould growth. Look for any discolouration, darkening, or a grey-blackish film on the surface of the candle or the wick.
Determine the severity of mould growth
If the mould has deeply penetrated the candle, it is best to dispose of it entirely. Mould spores can spread, and burning a severely mouldy candle can produce toxic fumes, causing respiratory issues such as sneezing, coughing, or difficulty breathing.
Improve storage conditions
If the mould is not severe and you plan to continue using the candle, improve your storage conditions to prevent future mould growth. Store candles in a cool, dry place, away from humid areas like bathrooms or kitchens. Use airtight or sealed containers for storage, protecting the candles from moisture, dust, and direct sunlight.
Clean the candle
For candles with light surface mould, wipe the affected area with a dry cloth before lighting the candle. Ensure you clean the candle regularly to prevent mould from returning.
Choose high-quality candles
Investing in high-quality candles made from well-refined wax and synthetic fragrance oils may reduce the likelihood of mould growth. Paraffin wax candles are less likely to get mouldy compared to natural wax candles, such as soy wax or beeswax candles.
Remember, while light surface mould can be cleaned, heavily mouldy candles should be discarded to prioritise your health and prevent the further spread of mould.
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Beeswax candles and bloom
Beeswax candles are known to develop a "bloom", a white, dusty film on their surface. This is a natural oxidation process that occurs only with 100% pure beeswax, and is considered a positive sign of the candle's purity. The bloom can give the candle a vintage or frosted appearance, which some people find aesthetically pleasing. However, others may prefer their candles to be glossy and polished.
The bloom on beeswax candles is not mould. Mould can develop on candles made from other types of wax, such as soy wax, if they are stored improperly. Soy candles, for example, are vulnerable to mould if kept in a warm and humid environment, as this attracts fungus spores. To prevent mould, soy candles should be stored in a cool, dry place, away from direct sunlight and other heat sources.
If you prefer your beeswax candles to be shiny and new-looking, you can remove the bloom by simply wiping the surface with a soft cloth or nylon. This will temporarily restore the candle's shine, but the bloom will return in a few days or weeks due to the natural properties of pure beeswax. For candles with ridges or hard-to-reach places, you can use a hairdryer to briefly warm up the surface and make the bloom disappear. Alternatively, you can try running hot water over the candle and then wiping it dry, but be careful not to get the wick wet.
It is important to distinguish between bloom and mould. Mould on candles can cause respiratory problems such as sneezing, coughing, and difficulty breathing. If you suspect mould on your candle, it is best to err on the side of caution and dispose of the candle immediately.
In summary, beeswax candles and bloom are interconnected concepts. The appearance of bloom on a beeswax candle indicates its purity, and some people appreciate the vintage or frosted look it creates. However, if you prefer a glossy finish, you can easily remove the bloom with a soft cloth or mild heat. It is important to distinguish bloom from mould, as the latter can be harmful, while the former is a natural and desirable characteristic of pure beeswax candles.
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Respiratory issues caused by moldy candles
While candles can be a great way to create a cosy atmosphere, it's important to be aware of the potential dangers they can pose. Soy candles, in particular, have gained popularity for their long burn time and natural soybean wax construction. However, one of their downsides is their susceptibility to mould growth. If stored improperly, soy candles can attract fungus spores, leading to mould formation on the wax or wick.
Mouldy candles are not just unpleasant to look at, but they can also be a serious health hazard, especially for individuals with allergies or respiratory issues. Exposure to mould can trigger allergic reactions and asthma symptoms in people allergic to mould. The spores released by burning a mouldy candle can cause a range of respiratory issues, including sneezing, coughing, and even difficulty breathing. The smoke produced may contain toxic chemicals, further exacerbating the problem.
To prevent potential health risks, it is crucial to inspect candles, especially soy candles, before lighting them. Discolouration, darkening, or any signs of mould or mildew indicate that the candle should be discarded immediately. Proper storage is essential to avoid mould growth. Candles should be stored in a cool, dry place, away from direct sunlight and other heat sources. Sealed containers can provide additional protection from moisture and temperature fluctuations.
Additionally, it is important to be mindful of the overall usage of scented candles and their potential impact on respiratory health. Studies have shown that burning scented candles can lead to adverse respiratory symptoms such as cough and shortness of breath. While further research is needed, the emission of VOCs, phthalates, and PM from scented candles is suspected to contribute to these respiratory issues. Therefore, it is advisable to use candles sparingly and ensure proper ventilation when burning them.
In summary, mouldy candles can pose a significant risk to respiratory health. By taking simple precautions, such as proper storage and regular inspection, we can minimise the chances of mould growth and enjoy our candles safely. When in doubt, it is always best to prioritise health and discard any candles showing signs of mould or discolouration.
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Frequently asked questions
Yes, candles can grow mold, especially if they are made with natural ingredients or stored improperly.
To prevent mold from growing on your candles, store them in a cool, dry place, away from direct sunlight and other heat sources. It is also recommended to store them in sealed, airtight containers to protect them from moisture and dust.
If you notice mold on your candle, it is best to throw it away immediately, especially if it is a soy candle, as burning it can produce toxic fumes. For candles with less severe cases of mold, you can try cleaning the surface with a soft cloth and rubbing alcohol.











































