Ruqayyah Snyder
Castile soap is a popular, natural, and eco-friendly liquid soap base that has been used in Europe for centuries. It is made through the chemical reaction of a fat and an alkali, known as saponification. Traditionally, castile soap was made with olive oil, but today, soap makers have started making bastile soap, which includes other oils and cosmetic butters to enhance skin-softening qualities. While castile soap can be purchased ready-made, it can also be made at home with just a few ingredients, such as olive oil, coconut oil, and distilled water. In this article, we will explore how to make castile soap in Australia, covering the ingredients, process, and safety precautions to consider.
How to make Castile soap in Australia
| Characteristics | Values |
|---|---|
| Form | Hard bar soap or liquid soap |
| Ingredients | Olive oil, coconut oil, jojoba oil, potassium hydroxide lye, distilled water, glycerine, citric acid, essential oils |
| Equipment | Slow cooker, spatula, immersion blender, cheese grater, ladle, funnel |
| Precautions | Lye is highly poisonous and can cause burns and irritation; wear gloves, safety glasses, and a mask |
| Uses | Body and hand washes, household cleaners, shampoos, natural recipes, baby soap |
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What You'll Learn
Choosing the right ingredients
When making liquid Castile soap from scratch, it is crucial to use distilled water as the pH and mineral content of tap water can vary and impact the chemical reactions during the soap-making process. You can also add 8 ounces (230 g) of glycerin to the lye solution for a more moisturising soap. Always use caution when handling potassium hydroxide lye, as it is highly poisonous if ingested and can cause burns and irritation if touched or inhaled. Keep it away from children and pets, and always wear protective gear, including gloves, safety glasses, and a mask.
If you are making solid Castile soap bars, you will need to adjust the amount of water in your recipe. By decreasing the water, your soap will take less time to harden in the mould and behave more like a standard soap recipe. You should be able to remove it from the mould in about 24 hours.
Castile soap is a great option for those with sensitive skin, especially babies and young children. If you intend to use it for this purpose, omit any essential oils or fragrances as they can be irritating. Instead, opt for fragrance-free Castile soap, which is purer and safer for delicate skin.
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Preparing the mould
Once you have your mould, you can line it with wax paper or plastic wrap. This will make it easier to remove the soap from the mould once it has hardened. Cut the wax paper or plastic wrap to fit the mould, and then use tape or rubber bands to secure it in place.
If you are using a more complex mould with lots of nooks and crannies, you may need to brush a thin layer of oil on the inside of the mould to ensure the soap doesn't stick.
After preparing the mould, you can begin making your soap. Once the soap is ready, carefully pour it into the mould, taking care not to spill. Remember that castile soap can take up to 24 hours to harden in the mould, so it is important to be patient and not try to remove it too soon.
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Mixing the solution
Preparing the Ingredients
Firstly, ensure you have all the necessary ingredients and equipment. For a traditional castile soap recipe, you will need olive oil, water, and an alkali such as sodium hydroxide or potassium hydroxide lye. You may also want to include essential oils for fragrance. It is important to wear protective gear, including gloves, safety glasses, and a mask, as lye can cause burns and irritation if touched or inhaled.
Mixing the Oils
Measure out the olive oil and any other oils you plan to use, such as coconut oil or jojoba oil. Combine and mix the oils in your slow cooker or pot. Warm the oil mixture over low to medium heat, stirring occasionally to ensure even heating. You can use a spatula to stir the oils gently.
Adding the Lye Solution
In a separate container, prepare the lye solution by slowly adding the lye to the water, or vice versa, while stirring. Never add water to lye, as it can cause a violent reaction. Always add lye to water gradually and carefully to control the reaction and prevent splashing. Ensure the lye is fully dissolved in the water before proceeding. You can also add glycerin to the lye solution at this stage if you want a more moisturising soap.
Blending the Solution
Once your oil mixture is warm and your lye solution is ready, it's time to combine them. Slowly and carefully pour the lye solution into the slow cooker or pot with the oil mixture, stirring continuously as you add the lye. Use an immersion blender to thoroughly blend the oil and lye together. Blend until the mixture reaches a light trace, which means it has thickened slightly and leaves a trace on the surface when you lift the blender. Be cautious when handling hot soap, as it can cause burns.
Adding Fragrance and Colour
If you wish to add essential oils for fragrance, now is the time to do so. Add your chosen essential oils a few drops at a time, stirring well after each addition. You can also add natural colourants at this stage if desired, such as clay or plant-based powders. Stir the mixture gently to ensure even distribution of fragrance and colour.
Remember to always work in a well-ventilated area and follow safety precautions when handling lye and hot soap.
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Adding fragrance
If you are making soap for babies or young children, it is recommended to omit any essential oils and opt for fragrance-free soap. If your children are a little older, you can add a small amount of essential oil, but it is advised to avoid synthetic fragrance oils.
To make a natural hand wash, combine 240mls of castile soap, 15-20 drops of your preferred essential oil, and 1 teaspoon of vitamin E (optional) in a glass or ceramic pump bottle and mix well. If you prefer thicker soap, you can add a little salt solution—combine one part table salt with four parts warm water and leave to dissolve for one hour.
You can also make a foaming hand wash by combining 1 cup of distilled water, 1/4 cup of liquid castile soap, and a few drops of essential oil in a reusable foaming soap dispenser and shaking until combined.
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Storing the soap
Firstly, you will need to ensure your soap is fully cured. This process can take up to four to six weeks, so it is important to be patient. During this time, the water in the soap will evaporate, and the bars will become milder and harder. To cure the soap, lay the bars on a piece of waxed paper or a rack in a cool, dry place with good airflow. Turn the bars over every few days to ensure even curing.
Once your soap is fully cured, you will need to store it correctly to maintain its quality. Castile soap is a natural product and does not contain synthetic preservatives, so it is important to protect it from excess moisture and humidity. Keep your soap in a dry, well-ventilated area, away from direct sunlight. Wrap the bars in wax paper, or keep them in paper bags to retain their freshness and absorb any excess moisture.
You can also store Castile soap in an airtight container. This will help keep the soap dry and prevent it from absorbing unwanted odours. However, ensure the soap is not stored in a completely airtight environment, as this can cause condensation and make the soap soggy.
If you are storing liquid Castile soap, always use a pump bottle to dispense the soap. Avoid pouring the soap back into the container, as this can introduce bacteria. Keep the bottle tightly sealed when not in use, and do not allow water to enter the bottle, as this will dilute the soap and reduce its shelf life.
With proper storage, your Castile soap should last for many months and can even improve with age, becoming more firm and long-lasting.
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Frequently asked questions
You will need olive oil, distilled water, and an alkali such as sodium hydroxide or potassium hydroxide lye. You can also add essential oils for fragrance.
You can make liquid castile soap or a hard bar soap. Liquid castile soap is more versatile and can be used as a cleaning solution, hand wash, body wash, shampoo, dish soap, or shower scrub. It can also be used as a base for other soaps. Hard bar castile soap is great for washing your hands, body, and hair.
First, measure and pour your oil into a slow cooker and turn the heat on high. Then, carefully add the lye solution to the slow cooker, adding it slowly so the solution doesn't splash. Next, use an immersion blender to blend the oil and lye together. Finally, use a ladle to transfer the liquid soap into a container. Always take precautions when handling hot soap and lye, which is highly poisonous if ingested and may cause burns and irritation.
