
Adding perfume to soap is a fun and creative way to personalize your body care products and create a unique soap that matches your preferences. However, it is important to be aware of the different methods and dosages to avoid altering the final product. The amount of perfume or fragrance oil added to soap depends on various factors, such as the type of soap base, the fragrance concentration, and the desired scent strength. Different bases, such as cold process soap, hot process soap, or melt-and-pour soaps, require adjustments in the dosage of fragrance. Additionally, certain fragrances may be more prone to fading or altering during the soap-making process, and some fragrances with specific components can even change the color of the soap. Understanding these factors is crucial to ensure the desired scent strength and the quality of the final product.
| Characteristics | Values |
|---|---|
| Cold process soap | 30g of fragrance oil per kg of fats/oils in the recipe. |
| Hot process soap | 15-20g of fragrance oil per kg of fats/oils in the recipe. |
| Melt and pour soaps | 10g of fragrance per kg of melt and pour soap base. |
| Lotions, creams, balms, shampoos, bath gels | 1-3% by weight |
| Almond Fragrance Oil | 0.16 ounces per pound of cold process soap |
| Amber Fragrance Oil | N/A |
| Ginger Patchouli Fragrance Oil | N/A |
| Sensuous Sandalwood Fragrance Oil | N/A |
| Cherry Almond Fragrance Oil | 0.2 ounces per pound of cold process soap |
| Clay | 1/2 teaspoon per pound of soap |
| Cure location | Cool, dry place out of direct sunlight |
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What You'll Learn

Dosage depends on the soap base
The dosage of perfume to use in soap depends on the type of soap base. For cold process soap, a strong scent can be achieved by adding 0.2 to 0.8 ounces of fragrance or essential oil per pound of soap. However, it is important to note that the pH level of cold process soap can alter the scent of the oil, causing it to smell differently. To avoid this, consider using a fragrance calculator to determine the exact amount of fragrance to add, taking into account the specific scent selection.
For hot process soap, it is recommended to use high flashpoint oils to withstand higher temperatures. The general guideline is to add 15-20 grams of fragrance oil per kilogram of fats/oils in the recipe.
Melt-and-pour soaps are another popular option, and the dosage for these bases varies. It is recommended to add 0.25 ounces of essential oil or 0.5 ounces of fragrance oil per pound of melt-and-pour soap base. However, this amount can be adjusted based on the desired scent strength and the specific fragrance used.
Additionally, the type of fragrance can impact the dosage. For example, almond fragrance oil is on the stronger side, so a smaller amount is needed to achieve a noticeable scent. It is also worth noting that some fragrances, particularly floral scents, can cause cold process soaps to accelerate or 'seize'. In such cases, it is important to use enough water in the recipe to prevent this issue.
When creating scented soap, it is crucial to choose a fragrance that suits the soap base. Oil-based, aqueous-based, and essential oil-based fragrances are all options, and the chosen base will influence the dosage required. Using clay can also help set the scent and add beneficial properties to the skin, enhancing the overall quality of the soap.
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Some fragrances may change soap colour
Adding perfume to your soap can be a fun and creative way to personalise your body care products. However, it is important to be aware that some fragrances may change the colour of your soap.
The presence of vanillin or ethyl vanillin in a scent can alter the colour of your soap, depending on its percentage. This component can turn your soap from beige to dark brown. Therefore, it is important to know the composition of your fragrance before adding it to your soap base.
To avoid unexpected colour changes, you can opt for fragrance oils that have been specifically formulated for soap making. These oils are designed to withstand the harsh environment of cold and hot saponification processes, which involve several pH changes. Additionally, by using fragrance calculators, you can determine the exact amount of fragrance oil to add to your soap, reducing the risk of discolouration.
Another way to mitigate colour changes is by using clay, such as kaolin clay, which can help with scent retention. While the effectiveness of this method is not fully proven, it is believed that clay can absorb and retain fragrance oils, making them last longer in your soap. Additionally, certain types of clay can impart a subtle colour to your soap, helping to mask any unexpected colour changes caused by fragrances.
Finally, it is important to respect the dosages and methods of adding fragrance to your soap. For solid soaps, it is recommended to not exceed 5% perfume. By following the recommended dosages, you can avoid altering the soap base and minimise the risk of unexpected colour changes.
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Prevent scent fading with clay
When creating your own scented soap, it's important to know the different methods and dosages to avoid any alteration of the final product. The amount of fragrance oil you should use depends on the type of soap you are making. For cold process soap, use 30g of fragrance oil for every kilogram of fats/oils in your recipe. For hot process soap, use 15-20g of fragrance oil for every kilogram of fats/oils. For melt-and-pour soaps, use 10g of fragrance for every kilogram of the soap base.
To prevent scent fading in your soap, there are several methods you can use. One popular method is called "anchoring", which involves pairing lighter scents with deeper, earthier, or more complex scents to "anchor" them in the soap. For example, you can try anchoring lime essential oil with earthy patchouli essential oil, as seen in Bentonite Clay Soap.
Another method to prevent scent fading is to use clay, specifically kaolin clay, which is believed to help with scent retention. The theory is that clay holds onto the fragrance or essential oil, making it last longer. While there hasn't been extensive testing on this theory, it is found that kaolin clay adds a nice slip and subtle colour to the soap.
Additionally, temperature plays a role in scent retention. Each fragrance and essential oil have a flashpoint, which is the temperature at which the liquid can ignite with a flame. Some believe that if a scent reaches its flashpoint, it can cause the fragrance to fade. Therefore, it is recommended to use lower temperatures when working with low flashpoint scents and to avoid the gel phase.
Finally, to ensure the scent stays strong, cure the soap in a cool, dry place, out of direct sunlight. You can also dip a cotton ball or paper towel in the fragrance oil and place it by the soap while it cures, allowing the bars to absorb some of the scents.
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Cold process soap affects scent
The cold process for making soap is a harsh environment for scents, as it involves several pH changes. This means that some scents, such as coconut fragrances and citrus essential oils, tend to fade. However, there are ways to make these lighter scents last longer in cold-processed soap.
One way to make lighter scents last longer is to pair them with deeper, earthier, or more complex scents to "anchor" them in the soap. For example, lime essential oil can be anchored with earthy patchouli essential oil, and lime distilled essential oil can be anchored with earthy coconut lemongrass fragrance oil.
Another way to anchor fragrances in cold-processed soap is to use additives such as kaolin clay, colloidal oatmeal, or soft botanicals like calendula petals. Kaolin clay is a popular choice as it does not darken or alter the colour of the batch oils, it is super-fine so it does not impart a gritty texture, and it is inexpensive. It is also generally well-received by all skin types and can add beneficial properties to the soap, such as a natural humectant that helps skin lock in moisture. Fine clays, colloidal oatmeal, and soft botanicals give fragrance oils something to hold on to during the cure and can increase the fragrance oil's potency and longevity.
The temperature is another factor to consider when making scented soap. Each fragrance and essential oil has a flashpoint, which is the temperature at which the liquid can ignite with a flame. Heating a scent to its flashpoint temperature can cause the fragrance to fade, so if you are using a low flashpoint scent, you may want to avoid the gel phase of soapmaking, during which soap can get as hot as 180 °F.
Finally, to ensure that the scent in your soap stays strong, cure the soap in a cool, dry place out of direct sunlight. You can also dip a cotton ball or balled-up paper towel in the fragrance oil and place it by the soap while it cures, as this is thought to help the bars absorb some of the scents.
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Commercial perfumes are difficult to use
Secondly, commercial perfumes contain additives like ethanol, fixatives, stabilizers, and UV-absorbents, which can interfere with the soap-making process. These additives may not be compatible with the other ingredients in soap and could affect the final product's quality and safety.
Thirdly, perfumes and colognes are often alcohol-based, and alcohol can be tricky to work with in soap-making. It can cause the soap to seize, especially in cold process soap-making. This can result in wasted perfume and soap, as well as potentially unsafe concentrations of fragrance that can irritate the skin.
Additionally, commercial perfumes may not be cost-effective for soap-making. They are usually sold in bulk and are exclusive to large soap manufacturers, making them less accessible and more expensive for individual soap makers.
Lastly, the fragrance in commercial perfumes may not withstand the soap-making process, especially cold process soap-making, which involves several pH changes. Some scents may fade or disappear entirely during saponification, the chemical reaction that occurs during soap-making. Therefore, it is crucial to choose fragrances that are specifically designed for use in soap and to follow recommended dosage guidelines.
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Frequently asked questions
The amount of perfume or fragrance oil you use depends on the type of soap you are making. For cold process soap, you can use 0.2-0.8 ounces of fragrance oil per pound of soap. For hot process soap, use 15-20g of fragrance oil for every kilogram of fats/oils in your recipe. For melt-and-pour soaps, use 0.25-0.5 ounces of fragrance oil per pound or 10g of fragrance for every kilogram of the soap base.
To ensure the scent stays strong, cure your soap in a cool, dry place out of direct sunlight. You can also use clay, such as kaolin clay, to help with scent retention and give your soap a subtle colour.
Add the fragrance to your fats/oils before adding the caustic soda solution. Work quickly, and you should have time to get your soap into the mould.
Commercial perfumes are difficult to use in soap as they contain ethanol and other additives. Instead, use fragrance oils or essential oils.
Yes, but be aware that some fragrances can be denatured during saponification, and some notes may disappear. Also, some fragrances may cause your soap to accelerate or 'seize'.











































