Seamus Hammond
When it comes to scented candles, the type of scent used can make a big difference to the overall experience. Two of the most common types of oils used in candles are fragrance oils and essential oils. While essential oils are natural compounds, fragrance oils are artificially created scents designed to imitate something found in the real world or to produce a unique scent experience. Both types of oils are used in candle-making, and the choice between the two depends on various factors, including scent strength, sustainability, and safety.
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What You'll Learn
Fragrance oils are synthetically made
While essential oils are natural compounds extracted from plants, fragrance oils are synthetically made. They are artificially created scents designed to either imitate something found in the real world or to produce a scent experience that you wouldn't find naturally. Fragrance oils are made in labs and can be tweaked to create all kinds of scents, from classic scents like jasmine and sandalwood to unique combinations. The fragrance oils used in candles are often sourced from fragrance manufacturers that specialize in recreating popular home fragrances.
The process of creating fragrance oils involves five steps: conceptualization, formulation and evaluation, testing and approval, manufacturing, and distribution. The concept for a fragrance oil can come from the product development team, a fragrance house, or a collaboration between the two. The fragrance house's team of perfumers and perfumer assistants then formulate the fragrance, taking safety guidelines, planned application, and budget into consideration. They work with thousands of fragrance ingredients, including natural oils, essences, and other natural materials, as well as lab-created aromatic compounds and synthetic chemicals.
The synthetic nature of fragrance oils offers several advantages. They provide consistency, as they can be made repeatedly to exacting specifications, ensuring a stable scent profile. This allows candle makers to produce candles with a reliable aroma, and often with less fragrance oil required compared to essential oils. The compositions of fragrance oils can also be adjusted to reduce the likelihood of allergic reactions or skin irritation, making them a suitable choice for people with sensitivities.
When using fragrance oils in candle making, it is important to consider the density and strength of the fragrance. As each fragrance oil has a different density, the amount added will vary to achieve the desired scent level. Some fragrances are stronger and require smaller amounts, while others are lighter and need larger quantities. It is recommended to weigh the fragrance in grams for accuracy. Additionally, the temperature of the wax and the flash point of the fragrance oil are crucial factors. The flash point is the temperature at which the oil starts to vaporize and evaporate, and adding the oil above this temperature will result in a loss of fragrance.
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Essential oils are natural compounds
While fragrance oils and essential oils are both used in candles, soaps, perfumes, and bath bombs, they have distinct differences. Essential oils are natural compounds extracted from plants, capturing the plant's scent and flavour, or "essence". They are highly concentrated hydrophobic liquids containing volatile chemical compounds from plants. The term "essential" refers to the essence of the plant's fragrance, not its necessity to the human body.
Essential oils are often associated with therapeutic benefits and are appreciated for their natural origins. They are commonly used in aromatherapy, a form of alternative medicine that ascribes healing effects to the aromatic compounds in essential oils and other plant extracts. Aromatherapy may be useful for inducing relaxation, but there is insufficient evidence that it can effectively treat any condition. It is important to note that essential oils can cause allergic reactions, inflammation, and skin irritation, and can be poisonous if ingested or absorbed through the skin.
The process of extracting essential oils is also important. True essential oils are those that have been minimally altered by the extraction process, typically through distillation or mechanical cold pressing. The way the oils are made is significant because essential oils obtained through chemical processes are not considered authentic.
Essential oils are complex mixtures of volatile compounds, particularly abundant in aromatic plants. These volatile molecules include monoterpenes and sesquiterpenes, as well as phenolic compounds. Their chemical composition gives them biological activities such as antioxidant, anti-inflammatory, and antimicrobial properties, making them valuable in the food, cosmetic, and health industries. Additionally, essential oils have been found to have allelopathic effects, inhibiting weed germination and growth, which has promising applications in organic crop cultivation.
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Fragrance oils are more stable
While essential oils are natural compounds, fragrance oils are manufactured in a laboratory. They are created through a complex process of chemical synthesis, where a combination of synthetic aroma chemicals is used to mimic the scent of natural substances. Synthetic fragrance oils can be composed of as many as 80 chemical ingredients.
Synthetic fragrance oils are more stable than essential oils. This is because they can be made repeatedly to exacting specifications, which ensures a stable scent profile. This allows candle-makers to produce candles with a reliable aroma. In contrast, the scent of an essential oil can vary depending on numerous factors, including the plant's growing conditions and the extraction process. This variability can make it challenging to produce a candle with a consistent scent profile.
The scent of a fragrance oil can be easily tweaked, making it less likely to cause allergic reactions or skin irritation. This is not the case with essential oils, which are highly concentrated and can cause allergic reactions. Synthetic fragrance oils are also more sustainable than essential oils. For instance, to extract sandalwood oil, an entire sandalwood tree must be felled, a species considered vulnerable in some areas.
The average shelf life of a fragrance oil is anywhere from six to 12 months, depending on its composition. They can last longer if stored in a cool, dark place. You can tell if a fragrance oil has gone bad if it smells off, or if the scent fades faster than normal.
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Essential oils are highly concentrated
Essential oils are made by steaming or pressing various parts of a plant, including flowers, bark, leaves, or fruit, to capture the compounds that produce fragrance. The scent of an essential oil can vary depending on factors such as the plant's growing conditions and the extraction process. This variability can make it challenging to produce a candle with a consistent scent profile.
Fragrance oils, on the other hand, are synthetically made and can be created in labs to produce a wide range of scents, from classic fragrances like jasmine and sandalwood to unique combinations. They are designed to either imitate scents found in the real world or to create a scent experience that is not found naturally. Fragrance oils can contain essential oils as part of their ingredients, but they also contain chemicals.
When it comes to scented candles, the choice between using essential oils or fragrance oils can impact the overall experience. Fragrance oils offer advantages such as consistency, stable scent profiles, and better value for money. They are also less likely to cause allergic reactions or skin irritation, making them a more suitable choice for people with sensitivities. However, essential oils are preferred by those who appreciate their natural origins and potential therapeutic benefits.
To summarise, essential oils are highly concentrated natural extracts that offer potential therapeutic benefits but require careful use due to their potency. Fragrance oils, being synthetic, provide more control over scent profiles and are less likely to cause allergic reactions, making them a popular choice for scented candles and other fragranced products.
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Wax and fragrance don't chemically bond
When creating scented candles, fragrance oils are often added to wax. However, despite the common use of the term "bonding" to describe this process, wax and fragrance oils do not chemically bond. Instead, they form what is known in chemistry as a ""solution" or "homogenous mixture". In other words, the fragrance oil dissolves in the molten wax, and when the wax cools and solidifies, the oil is incorporated and trapped within.
The lack of a chemical bond means that no reaction has occurred between the wax and oil. As a result, they are simply a mixture, and it is theoretically possible, although very difficult, to separate them. This is important to understand because it highlights that wax and oil do not truly "bind". The term "binding" is often used to describe the process, but it is misleading.
The process of adding fragrance oil to wax involves adding the oil to molten wax in a mould or container and stirring it. It is recommended to stir the mixture for at least two minutes to ensure the fragrance oil is fully incorporated into the wax. The temperature of the wax and oil is crucial, as fragrance oils have a "flash point", the temperature at which they start to vaporise and evaporate. If the wax is too hot, the oil will evaporate, resulting in a less fragrant candle. Therefore, it is generally advised to mix fragrances when the wax is slightly below the flash point temperature.
Additionally, it is important not to exceed the "maximum load" or "saturation point" of the wax, as this can lead to syneresis, or "bleeding". This occurs when the wax cannot hold the excess oil, resulting in liquid drops forming on the surface of the candle. To prevent this, it is crucial to ensure a homogeneous mixture before cooling and to not exceed the maximum load of the wax.
In summary, while the term "bonding" is commonly used to describe the process of adding fragrance oil to wax in candle-making, it is more accurate to say that they form a solution or mixture. Understanding the chemistry behind this process is essential to creating effective and aesthetically pleasing scented candles.
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Frequently asked questions
Wax is a petroleum-based substance with a high melting point and strong scent throw, while fragrance oils are synthetic products designed to mimic natural scents.
Fragrance oils are artificially created scents, crafted in labs by skilled perfumers. They are a blend of plant-based and synthetic ingredients.
The amount of fragrance oil added to wax depends on the desired strength of the scent. For paraffin wax, a range of 5-8% will result in a light fragrance, while 8-10% will be stronger. Soy wax may require a slightly higher percentage.
