Heidi Norton
There are two main ways to add fragrance to your soap. The most common way is to add either a fragrance oil or a pure essential oil. The second way to add scent to your soap is to use various aromatic liquids like tea or coffee. It is important to note that not all fragrance oils are compatible with soap making. For example, perfumes and colognes are usually alcohol-based, and alcohol can be tricky in soap. It is also important to consider the timing of when you add the fragrance to your soap. The general rule is to add the fragrance right before the soap has reached full trace.
How to use fragrance oils for soap making
| Characteristics | Values |
|---|---|
| Type of fragrance | Fragrance oils or essential oils |
| Pros of fragrance oils | Cheaper, wider variety of scents |
| Cons of fragrance oils | Some oils can lead to a failed batch |
| Pros of essential oils | Natural |
| Cons of essential oils | More expensive, fewer scent options |
| General rule for fragrance amount | 1.5-2 oz of fragrance for every 30 oz of soap oil |
| Timing | Add fragrance right before the soap has reached full trace |
| Liquid discounting | Less liquid = less fragrance oil |
| Anchoring fragrances | Use kaolin clay, especially with cold process soap |
| Kaolin clay slurry | Make by adding clay directly to the fragrance oil and blending |
| Usage rate | 1/2-2 TBS of clay per pound of batch oils |
| Alternative scent options | Tea, coffee, herbs, flowers |
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What You'll Learn
Anchoring fragrances in cold-process soap
To anchor fragrances in cold-process soap-making, one popular method is to use kaolin clay. Kaolin clay is a fine, inexpensive additive that can help to lock in moisture and add a bit of "slip" to cold-process soap bars. It is also well-received by all skin types and won't alter the colour of your batch oils.
To make the most of the absorption between the clay and the fragrance oil, you can create a "kaolin clay slurry" by adding the clay directly to the fragrance oil and blending it well with a mini mixer. It is recommended to make this mixture at least 24 hours in advance to give the clay time to absorb the fragrance oil.
Other fine clays can also be used as scent fixatives, and any additive that can easily absorb oil will help to keep scents anchored. For example, colloidal oatmeal can be used in soap recipes to create more fragrant and longer-lasting soaps.
Additionally, liquid discounting can play a role in fragrance retention. Using a lower liquid-to-lye ratio in your recipes will result in less liquid curing out of your soaps, leading to a more potent fragrance.
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Using kaolin clay as a scent fixative
Kaolin clay is a versatile ingredient used in soap-making. It is an all-natural ingredient found in soil and is easy to source locally. It is also cost-effective, gentle on the skin, and has excellent purifying properties.
When using kaolin clay as a scent fixative in soap-making, it is important to create a kaolin clay slurry. This involves adding the clay directly to the fragrance oil and blending it well. The clay will eventually settle at the bottom, so it is important to keep blending the mixture until it is ready to be added to the soap batter. The recommended usage rate of clay to fragrance oil is between 1/2 TBS to 2 TBS per pound of batch oils. It is also recommended to prepare the slurry at least 24 hours in advance to give the clay enough time to absorb the fragrance oil.
The amount of kaolin clay used as a scent fixative can vary depending on the size of the batch and personal preference. Some sources suggest using 1 teaspoon per pound of product (ppo), while others have used up to 1 tablespoon with no issues. However, it is important to note that using too much kaolin clay can cause the soap to become crumbly or dry out the skin.
Kaolin clay is an excellent choice for soap-making due to its versatility, gentleness, and ability to enhance the fragrance of the soap. By creating a kaolin clay slurry and adding it to the soap batter, soap-makers can effectively use kaolin clay as a scent fixative.
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Liquid discounting and lye concentrations
Liquid discounting and lye concentration are important considerations when making soap with fragrance oils. Lye (sodium hydroxide or caustic soda) is an alkaline substance that, when mixed with acidic oils or fats, initiates the saponification process, resulting in soap. The amount of lye required depends on the type of oil or fat used. For instance, converting one ounce of coconut oil into soap requires 0.18 ounces of lye, whereas one ounce of olive oil requires only 0.14 ounces.
Lye concentrations typically range from 25% (full water) to 50% (equal parts lye and water) in soap-making. A 50% lye solution is the maximum strength possible under optimal conditions, and lowering the temperature can cause the lye to precipitate out of the solution, leading to uneven saponification. Concentrations between 33% and 40% are commonly used, with 40% or higher being necessary when adding extra liquids like cream or fresh ingredients like avocado puree. A higher lye concentration results in faster saponification and less time to work with the soap mixture.
Liquid discounting is advantageous when using fragrance oils because it reduces the amount of liquid that must cure out of the soap, thereby retaining more fragrance. A lye concentration of 33% (two parts liquid to one part lye) to 40% (1.5 parts liquid to one part lye) is recommended for more fragrant results. This technique, however, requires careful calculation to avoid using too little water, which can cause the lye to fall out of solution, leading to a lye-heavy soap that is unsafe due to the presence of unsaponified lye.
To ensure the safety and effectiveness of your soap, it is crucial to accurately calculate the amount of lye, water, and fragrance oil used in your recipe. The use of online lye calculators and experimentation within safe limits can help you perfect your soap-making process and create beautifully fragrant, safe, and nourishing bars of soap.
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The difference between fragrance oils and essential oils
When creating your own soaps, you can choose from a wide variety of fragrances. Fragrance oils and essential oils are two popular choices, each with their own unique characteristics and benefits. Here is some information about the differences between the two:
Fragrance oils are made with a combination of synthetic and natural ingredients, often including essential oils, extracts, resins, and other aroma chemicals. They offer a much broader range of scents than essential oils because they are not limited to natural sources. This greater variety, along with the fact that they are often cheaper to produce, means that fragrance oils are commonly found in many commercial products. The synthetic compounds in fragrance oils also make them more durable during the soap-making process and help them to remain stronger once the soap is made. To get the most out of fragrance oils, some soap makers recommend creating a ""kaolin clay slurry"" by adding kaolin clay directly to the fragrance oil. This allows the clay to absorb as much fragrance oil as possible, enhancing the scent of the final product.
Essential oils, on the other hand, are 100% natural oils extracted from different parts of plants, such as flowers, herbs, or roots. The extraction processes used, such as steam distillation or cold extraction, ensure that the sensitive compounds in the plants do not break down. While there are fewer options for essential oils, as not all plants produce them, they offer natural scents that are preferred by those who want to avoid synthetic ingredients. Essential oils are also known for their health benefits and gentle qualities, making them a good choice for those with sensitive skin.
Both fragrance oils and essential oils have their advantages in soap making, and some soap makers even choose to combine the two in their recipes. Ultimately, the choice between fragrance oils and essential oils depends on personal preference, the desired scent, and the specific requirements of the soap-making process.
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When to add fragrance to soap
When making soap, there are two main ways to add fragrance: using fragrance oils or pure essential oils. The former is cheaper, has a wider variety of scents, and is a formula or combination of chemicals or essential oils that produce a unique scent. However, some fragrance oils can lead to a failed batch. On the other hand, essential oils are more natural as they are usually a single ingredient extracted from a plant but are more expensive.
Another way to add scent to your soap is by using aromatic liquids like tea or coffee, but be aware that these liquids can change the pH of the water, causing a stronger reaction when you add the lye. To ensure your fragrance doesn't seize or cause your soap to streak, add it (and any other additives like colour or herbs) right before the soap reaches full trace. You can also try anchoring your fragrance with kaolin clay, which can help to make the scent last longer. To do this, make a kaolin clay slurry by adding the clay directly to the fragrance oil and blending it well. Leave this mixture for at least 24 hours before making your soap to allow the clay to absorb as much fragrance oil as possible.
It's important to note that perfumes and colognes should not be used in soap-making as they are usually alcohol-based, which can be tricky to work with and may not be skin-safe. Instead, use fragrance or essential oils that are designed to be used in soap-making to avoid disrupting the chemical reaction of the soap-making process.
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Frequently asked questions
The best way to add fragrance oil to soap is by making a kaolin clay slurry. To do this, simply add the clay directly to the fragrance oil and blend it well with a mini mixer. It is recommended to make the slurry at least 24 hours in advance to give the clay time to absorb the fragrance oil.
The general rule is to use 1.5 to 2 ounces of fragrance oil for every 30 ounces of soap oil. This ratio provides enough scent while being gentle on the skin.
No, it is not recommended to use perfume or cologne as a substitute for fragrance oil in soap making. Perfumes and colognes are usually alcohol-based, which can disrupt the chemical reaction and cause the soap to seize. It is best to use fragrance oils or essential oils that are specifically designed for soap making.
