Seamus Hammond
Making perfumed bar soap at home is a fun and rewarding project. The process is simple and allows you to customise your soap with different scents, colours, and natural ingredients. Soap is made by combining fat or oil with an alkali, which is a chemical called lye. The type of oil and alkali used will depend on whether you are making bar or liquid soap. Once the soap mixture is ready, it can be poured into moulds and allowed to harden. You can then remove the soap from the moulds, cut it into bars, and wrap it as a gift or use it yourself.
| Characteristics | Values |
|---|---|
| Ingredients | Fat/oil (animal or plant-based), alkali (lye/sodium hydroxide), water, essential oils, natural ingredients, fragrance oils, and colorants. |
| Molds | Wooden, silicone, PVC plastic, individual soap molds, or a baking pan. |
| Techniques | Melt-and-pour, hot process (external heat), cold process (natural internal heat), and mixing fragrances. |
| Safety | Work in a ventilated area, avoid touching lye with bare hands, and prevent inhalation of fumes. |
| Customization | Scents, colors, textures, and shapes can be customized. |
| Curing | Leave the soap to cure and harden for 2-4 hours to several weeks, depending on the process. |
| Cost | Around $1.50 per small bar of homemade soap. |
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What You'll Learn
Choosing a mould
Choosing the right mould is an important step in making perfumed bar soap. The moulds can be made of plastic, silicone, or PVC plastic, and come in various shapes and patterns. You can also use a wooden loaf mould, which is a good option if you plan on making multiple batches of soap. Etsy and eBay are good sources for finding wooden moulds at lower prices. If you're not ready to invest in a mould, a 9 by 12-inch baking pan or Pyrex dish can also be used. Individual soap moulds are also available, which don't require any cutting after the soap has hardened.
When choosing a mould, it's important to consider the size and depth, as this will determine how long the soap takes to harden. Typically, the soap mixture is left in the mould for 2 to 4 hours, but it can also be left for up to 24 hours. After this, the soap should be firm to the touch and easily release from the sides of the mould.
It's also important to prepare the mould properly before pouring in the soap mixture. Tap the mould on your work surface to eliminate air bubbles, and smooth the top of the soap with a spatula. If desired, you can also top the soap with dried herbs before letting it harden.
Once the soap has hardened, carefully remove it from the mould. If you used individual moulds, simply pop the soap out. If you used a larger mould, you may need to cut the soap into bars with a soap cutter or knife.
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Selecting oils
Type of Oil
The type of oil you choose will depend on the desired scent and properties of your soap. Essential oils such as lavender, rose, sweet orange, eucalyptus, sandalwood, and orange are popular choices for scented soaps. You can also use carrier oils like coconut oil, olive oil, or palm oil as a base for your soap. These oils are typically solid at room temperature, so you will need to melt them before mixing with the other ingredients.
Scent and Fragrance
Fragrance oils and essential oils can be used to scent your soap. Fragrance oils are usually more concentrated, so you may need fewer drops. Essential oils like lavender, rose, and orange can provide a natural scent, while synthetic fragrance oils are generally less expensive and can be used to create more complex fragrances. You can experiment with different combinations of oils to create unique scents.
Skin Sensitivity
If you have sensitive skin, you may want to choose oils that are gentle and non-irritating. Some essential oils, such as peppermint, can irritate the skin, so it's important to use a smaller amount or avoid them altogether. You also have the option to make unscented soap if you're sensitive to fragrances.
Cost
The cost of the oils can vary significantly, especially when it comes to essential oils. If you're making soap on a budget, you may want to opt for less expensive options or use a smaller amount of the more expensive oils.
Ratio
The amount of oil you use will depend on the desired strength of the scent. As a general rule of thumb, use 2 to 5 grams of essential oil per pound of soap. For a lighter scent, start with around 20 drops of essential oil, and for a stronger scent, use up to 30 drops. Adjust the number of drops based on your preference and the quality of the oil.
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Adding fragrance
If you're using essential oils, a good rule of thumb is to use 2-3 teaspoons for every pound of soap. However, this may vary depending on the oil and your personal preference. For example, peppermint oil can be irritating to the skin, so it's recommended to use no more than 2 teaspoons per pound of soap base. On the other hand, fragrance oils are usually more concentrated, so you may want to start with fewer drops. It's a good idea to stick with one scent until you understand how it affects the finished soap.
You can also add texture and visual appeal to your soap by using finely ground nuts, oatmeal, or herbs. For example, you can add lightly pulsed oatmeal to your soap base for a natural and moisturising option. Or, for a springtime scent, you could try chopped herbs like lavender.
If you're making soap from scratch, you'll need to add your fragrance during the soap-making process. First, melt your chosen oils and weigh them in a large pot. Then, add your lye solution and stir. Once you've added the lye, you can include your fragrance of choice.
If you're using a melt-and-pour soap base, the process is even simpler. First, cut your soap base into cubes and heat them slowly in a pot over low heat until melted. Then, take the mixture off the heat and add your fragrance, colours, and textures.
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Mixing and pouring
The mixing and pouring stage of making perfumed bar soap is a crucial step in the process. Here is a detailed guide on how to mix and pour your soap mixture:
Mixing the Ingredients
Start by preparing your work area. Put on your safety gear, including gloves and goggles, and ensure you are working in a well-ventilated space. Measure out your ingredients, including the base oils such as coconut oil, and place them in a large pot or saucepan. If your oils are solid at room temperature, melt them gently before measuring and mixing. Weigh each oil precisely, and then stir everything together thoroughly. Check the temperature of the mixture with a heat-safe thermometer.
Adding Fragrance and Colour
Now it's time to add your chosen fragrance and any colourants. For essential oils, a good rule of thumb is to use 2-3 teaspoons per pound of soap, but this can vary depending on the oil and your preference for scent strength. For example, peppermint oil can be irritating to the skin, so use a smaller amount. You can also add natural ingredients for colour and texture, such as oatmeal or lavender.
Pouring the Soap
Once your mixture is ready, carefully pour it into your chosen moulds. Silicone or PVC plastic moulds are good options, or you can use individual soap moulds. Smooth the top of the soap with a spatula and tap the mould on your work surface to remove any air bubbles. If desired, top with dried herbs or other decorations. Allow the soap to harden completely, which can take 2- 24 hours depending on your moulds and the climate.
Unmoulding and Curing
After the soap has hardened, carefully remove it from the moulds. If you used individual moulds, simply pop them out. You can now use the soap, but it is recommended to let it cure further. Leave the soap bars to dry for another week to improve their hardness and quality. During this time, the water in the bars will fully evaporate, resulting in a milder soap. You can then package your perfumed soap bars in paper and ribbons, or wrap them in wax paper with rustic embellishments.
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Curing and packaging
Curing your soap helps any excess water evaporate, resulting in a harder and milder bar. It is recommended to cure your soap for 4-6 weeks in the open air, on a paper bag or baking rack. This allows the soap to fully cure before packaging. If you wrap the soap before it is fully cured, moisture can get trapped and cause the soap to go rancid.
Once your soap is fully cured, you can use paper packaging to wrap your bars. Plastic packaging is not recommended for two reasons. Firstly, single-use plastic is not environmentally friendly and is frowned upon by customers. Secondly, if there is any moisture left in the bars, it won't be able to escape, and excess moisture can cause the soap to develop orange spots and an unpleasant odour.
Melt-and-pour soap should be wrapped immediately after it has cooled and hardened. This type of soap has added glycerin that pulls in moisture from the air, so it needs to be wrapped tightly with plastic wrap to protect it from moisture. You can then wrap the soap in paper or add extra decorative elements.
To store your cured soap, keep it in a cool, dry place. Avoid the fridge, as this can cause glycerin dew or make the soap brittle.
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Frequently asked questions
You will need a fat or oil, an alkali, and a fragrance. The fat or oil can come from an animal or plant, and the alkali is a chemical called lye, which is sodium hydroxide for bar soap. You can use essential oils, fruit extracts, or herbs and spices for fragrance.
You will need safety gear, including long sleeves, gloves, and goggles, as well as a slow cooker or saucepan, a heat-safe thermometer, a plastic pitcher, a plastic spatula, a large plastic bowl, a mould, and a soap cutter or knife.
First, calculate the amount of lye using a lye calculator. Next, prepare the lye by mixing it with water in a well-ventilated area. Then, melt and mix your chosen oils. Combine the oil and lye mixtures, and pour into a mould. Allow the soap to harden for 2-4 hours, then release it from the mould. You can use the soap immediately, but it is recommended to let it dry for another week to improve its quality and hardness.
