How To Make Fragrance Soap?

Jun. 22, 2022

The first smell in a bottle is absolutely unforgettable. They can immediately inspire designs, colors, and additives for your next recipe. But if you've ever noticed a fading or changing scent in soap, you know how disappointing it can be. 

That said, there are a few tips and tricks to make them last longer.

1. Fragrance Amount

The rate of use plays an important role in scent retention. For a strong scent, you can add 0.7 ounces of fragrance or essential oil per pound of cold process soap. For melting and pouring, you can add 0.3 ounces per pound. This number will vary depending on the oils you choose. For example, the cherry almond fragrance oil is very strong. The maximum we recommend is 0.2 ounces per pound of cold process soap.

The fragrance calculator recommendations are based on our testing and safety guidelines developed by IFRA (International Fragrance Association) and RIFM (Research Institute for Fragrance Materials). Each has a maximum usage rate that is considered safe for bath and beauty products. Using more can cause skin irritation.


Even with the highest recommendations, some scents do not pass muster. The cold process is a harsh environment as it goes through several pH changes. Pure coconut scents and citrus oils like lemon tend to fade. The good news is that you can still use them for melting and pouring soaps, scrubs, etc. Lemon essential oil adds a crisp scent to this marble melt and pour soap. 

Cinnamyl alcohol is mainly used in the preparation of aromas such as apricot, peach, raspberry, plum, cosmetic essence, and soap essence.

2. Anchoring

You can also make your own - this is called anchoring. This involves pairing lighter scents with deeper, more rustic, or complex scents to "anchor" them in the soap. Try amber fragrance oil, ginger patchouli fragrance oil, or sensual sandalwood fragrance oil. In bentonite clay soaps, we anchor lime essential oil with earthy patchouli essential oil to help it adhere.

3. Clay

Some soap manufacturers like to use kaolin clay to help retain fragrance. The theory is that it will retain the perfume or essential oil and make it last. While we have not tested this theory extensively, we have found that kaolin clay adds a nice slip and subtle color to soap. Which clay is right for your skin?

Cinnamyl Alcohol

Cinnamyl Alcohol 

4. Temperatures

Every perfume and essential oil has a flash point. It is used to determine shipping restrictions - if the oil is heated to the flash point and comes in contact with an open flame, it may ignite. Some manufacturers also believe that if a scent is heated to that level, it will burn off and fade. 

We have not noticed significant fading at higher temperatures, but it is something to consider. If you are using a low flash point scent, use a lower temperature and avoid the gel phase, be extra careful. If you are making hot soap, you may want to stick with high flash point oils. 

5. Storage

To ensure that the scent stays strong, keep the soap in a cool, dry place out of direct sunlight. You can also dip a cotton ball or wadded-up paper towel into the fragrance oil and place it next to the soap as it cures. This is thought to help the bar absorb some of the scents during the treatment. Keep in mind that fragrance oils and plastic do not get along, so make sure your cotton balls are not sitting on a plastic surface. 

For best results, make sure the fragrances you use have been thoroughly tested and approved for use in soap. From there, experiment with blends and usage rates until you find the best choice for your recipe!

For more information about the best fragrance oils for soap making, welcome to contact us at +86 27 8557 9352 or write to us at We will be happy to help you out!

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