Homemade Castile Soap Recipe for Beginners

Making homemade castile soap is a great way to save money and have complete control over the ingredients.

Castile soap is a type of soap that originated in the Castile region of Spain, made from olive oil.

It's a versatile soap that can be used for a variety of purposes, including washing dishes, bathing, and even cleaning surfaces.

To make castile soap, you'll need just a few simple ingredients, including olive oil, lye, and distilled water.

A basic recipe for castile soap can be made with just 1 pound of olive oil, 1/2 cup of lye, and 1 cup of distilled water.

Expand your knowledge: Soap Water

To make the soap, you'll first need to create the lye solution by mixing potassium hydroxide (KOH) with water and glycerin in a well-ventilated area. This mixture will be cloudy at first, but will clear up as you stir the KOH into the water.

You'll also need to heat the olive oil in a slow cooker over low heat, then slowly add in the KOH mixture, stirring gently until they're well combined. As you continue to blend, the mixture will thicken and look like mayonnaise, then creamy pudding, before becoming grainy like mashed potatoes or applesauce.

If this caught your attention, see: What Does Soap Do to Water

Here are the key steps to making the soap paste:

This process can take around 3-4 hours, depending on the temperature and the specific ingredients you're using. Keep in mind that if you're using non-distilled water, the soap paste may stay cloudy no matter how long you cook it.

Expand your knowledge: Dr. Bronner's - Pure-castile Bar Soap

To make the solution, you'll need to weigh out the glycerine, water, and potassium hydroxide (KOH). The amount of each ingredient can vary, but a common ratio is 171g of distilled water to 114g of sodium hydroxide crystals/caustic soda.

Make sure to mix the water and glycerin first, then carefully add the KOH to the mixture in a well-ventilated area. Stir the KOH into the water until it dissolves, and be prepared for the mixture to be cloudy at first.

Keep your face away from the steam that comes up when mixing the lye and water. It's also essential to stir until the lye is completely dissolved.

Here's a summary of the ingredients needed for the lye solution:

Once you've mixed the lye solution, let it cool down to 100°F / 38°C before proceeding with the next step.

The cooking process is a crucial step in making soap, and it's essential to get it right. Cooking the paste will allow the soap to finish the saponification process and achieve a perfectly clear liquid soap.

The cooking process typically takes 3-4 hours, and you'll want to check on it and stir it up every half an hour or so. If the liquid is cloudy, continue to cook the soap in the slow cooker.

As you cook the mixture, it will begin to thicken up and become more translucent. You can expect the soap paste to go through various stages, including runny cream, cake batter, Elmer's glue, puffy white taffy, and finally, translucent gel.

To keep the gel progressing evenly, fold your soap paste over on itself and stir it around with a sturdy wooden spoon or high-heat spatula every 30 minutes or so. After 3 hours, check your soap paste. When your paste is done, it should look quite a bit like amber – translucent and golden.

Here's a rough guide to the stages you can expect during the cooking process:

Don't rush getting to this stage – if your soap needs more time at the end of the 3 hours, take the time to cook the paste for longer.

For homemade castile soap, you'll want to use vegetable oils exclusively, as they provide a gentle and moisturizing lather. Traditionally, olive oil was used alone, but modern recipes often blend in other oils like coconut.

To make a liquid castile soap, a 60/40 blend of olive and coconut oil is a good starting point. Olive oil is mostly long-chain fatty acids, which can make soaps feel slimy on their own, but when combined with coconut oil, they create a nice, all-purpose cleanser.

For olive oil, it's essential to use pure olive oil, as impurities can affect the clarity of the soap. You can use either extra virgin olive oil or a lighter olive oil, but make sure it's 100% pure.

Broaden your view: Pomace Olive Oil for Soap Making

To make the soap paste, start by measuring out the olive oil and heating it over low heat directly in the slow cooker.

The next step is to slowly add in the KOH mixture to the warm olive oil, and gently stir them together in the slow cooker.

You'll need to use an immersion blender to blend the ingredients together, and it's a good idea to take breaks during the blending process to avoid burning out the blender.

As you continue to blend, the mixture will thicken and look like mayonnaise, then later like a creamy pudding.

It will eventually become grainy like mashed potatoes or applesauce, but don't worry, this is a normal part of the process.

Continue to blend until the mixture starts to get creamy again, then you can stop blending with the hand-held blender and leave the soap paste cooking covered in the slow cooker.

Here are the steps to follow in more detail:

Choosing the right ingredients for your soap recipe can be a bit overwhelming, especially if you're new to soap making. This is because different ingredients can affect the final product's texture, lather, and even its ability to harden.

Using pure olive oil is crucial, as it will determine the amount of lye needed. If you're using a lighter olive oil, you may need to adjust the amount of lye accordingly.

Tap water is not recommended, as it can contain minerals and impurities that can affect the clarity of your soap. Distilled water, on the other hand, is a better choice.

Some soap recipes may call for a specific ratio of water to lye, but this can be adjusted depending on the recipe. For example, a Castile soap recipe may use a lower water-to-lye ratio to achieve a softer soap.

Here's a breakdown of the typical ingredients used in soap making:

Keep in mind that these amounts can vary depending on the specific recipe you're using.

Choosing the right oils and butters for your soap-making project can be a bit overwhelming, especially if you're new to the craft.

Coconut oil creates hard bars with fluffy lather, while Sunflower oil creates softer, conditioning bars. You can use a mixture of different oils to achieve a good balance.

Castor oil helps to stabilize lather, but using too much of it can result in sticky bars.

Olive oil, on the other hand, makes a great soap on its own, especially when used in its pure form. Extra virgin olive oil will give you a higher quality and more natural product, but it's also more expensive.

Here are some key ingredients to consider when making soap:

In general, it's a good idea to use a blend of oils to achieve a good balance of properties. For example, a 60/40 blend of olive and coconut oil can make a nice, all-purpose liquid soap with good bubbles.

This Castile soap recipe is just not suited for fragrance oils, as they can make the batter seize up. I've struggled with using them in the past, and it's just not worth the hassle.

If you want to add a scent to your Castile soap, essential oils are a much better option. They're gentler and won't cause the batter to seize up like fragrance oils can.

For little ones and babies, fragrance-free is always the best choice. This is because fragrance oils can be a risk to their developing skin, body, and brain.

If you do want to use essential oils on older kids, choose ones that are gentle and not too expensive, like lavender or sweet orange.

You might like: Homemade Laundry Soap with Essential Oils

If your homemade castile soap becomes clumpy, try allowing the grated soap to air dry overnight before mixing it with other ingredients. This can help prevent clumping.

To keep your soap fresh and prevent clumping, store it in a cool dry place where moisture is low. You can also add something like rice or a dry crust of bread to the container to absorb any excess moisture.

Always take precautions when using homemade castile soap, even if the ingredients are labeled as natural or organic. Some natural products can be toxic to pets or pregnant women, so apply a small amount first to check for potential reactions.

Recommended read: Dr Natural Castile Soap Bar

If your milk gets clumpy, it's probably due to moisture in the air. Try storing it in a cool, dry place.

To prevent clumping, you can also put something in with the powder that absorbs moisture, like rice or a dry crust of bread. This will help keep the powder dry and clump-free.

Clump-free storage is key. Store your milk powder in a tightly sealed container to keep moisture out.

Remember, even natural products can have potential risks. If you're concerned about clumping, consider applying a small amount first to check for reactions.

Discover more: Making Laundry Soap Powder

If you're new to making natural soap, start by reading my four-part series on natural soap making, which covers the basics of ingredients, equipment, and the soap making process.

You'll want to make sure you have the right ingredients on hand, which I cover in the "Soap Making Ingredients" section of my series.

A good pair of gloves is essential for protecting your skin from the lye in soap making, as I mention in the "Soap Making Equipment & Safety" section.

A fresh viewpoint: Lye Soap Ingredients

Don't be intimidated by the idea of working with lye - with the right safety precautions, you can make soap safely.

If you're looking for a simple recipe to get started, check out the "Easy Soap Recipes" section of my series, where I share a few beginner-friendly recipes.

The cold process soap making process can seem daunting at first, but breaking it down into steps can make it more manageable, as I do in the "The full cold process soap making process" section.

Here are the four key steps to get started with natural soap making:

If you've ever traveled to the open markets in the south of France, Italy, or Spain, you'll have seen lots of Castile soap. Most of it is actually Bastile, olive oil mixed with other oils to improve lather.

You can make your castile soap as colorful and as lovely scented as you'd like, using just three ingredients: water, lye, and olive oil. The optional lavender essential oil will give it a beautiful floral scent.

Expand your knowledge: Castor Oil Soap Bar

To customize your soap, consider using different essential oils to scent it, and my guide for how much you can use is available online. Depending on the oil you use, you may find that your soap cures to a bright white color.

Here's a simple guide to help you dilute the soap paste:

You can make your castile soap as colorful and scented as you'd like. The natural color of this soap is initially a light yellow and that can impact the final color of your bars.

Depending on the oil you use, you may find that your soap cures to a bright white color. You can also use different essential oils to scent it.

If you'd like to be more artistic with these bars, you can use various methods to naturally color handmade soap, as I've collected dozens of different ideas for you.

To create different scents, you can use essential oils like lavender, which gives a beautiful floral scent. My guide for how much you can use is over here.

If this caught your attention, see: How to Color Homemade Soap

Here are some general guidelines for customizing this recipe:

Remember, you can experiment with smaller combinations of oils until you find the perfect soap for your needs.

To dilute the soap paste, you can let it dissolve on its own in water over several hours or speed up the process by warming the water and soap paste over the stove or in the slow cooker.

For clear soap, use distilled water to minimize the risk of microbial contamination and cloudiness.

You can add 10 cups of distilled water to the soap paste in the crockpot and let it dissolve for 8 hours or overnight.

If you notice chunks of remaining soap or a thick skin forming, add another cup or two of water to further dilute the paste.

Here's a step-by-step guide to diluting the soap paste:

Before you start making your soap, it's essential to prepare your workstation. Cold-process soapmaking is chemistry, and lye is a caustic substance that requires careful handling.

First, put on rubber gloves, eye protection, and an apron to protect yourself from potential splashes or spills. This may seem like an obvious step, but trust me, it's crucial.

Next, carefully pre-measure the ingredients. The olive oil can go in a small stainless steel pan, the water into a heat-proof jug, and the lye in another container. If you're using essential oil, pre-measure it into its own small dish or ramekin.

It's also a good idea to have your mold at the ready, so make sure it's easily accessible. And don't forget to have all your tools and equipment within reach.

Here's a list of the essential items you'll need:

Finally, if you're using sodium lactate, mix the powder with one tablespoon of water before you begin. This will help it dissolve evenly and make it easier to incorporate into your soap recipe.

Molding and curing your handmade Castile soap is a crucial step to ensure it turns out right. Leave the soap batter in the molds for at least 48 hours, but it can take up to seven days to firm up.

If you're in a hurry, you can speed up the process by placing the molds in the fridge overnight. Handmade Castile soap can be a bit finicky, so it's better to err on the side of caution and leave it a bit longer if you're unsure.

Once the soap has hardened, carefully pop it out of the molds and transfer it to a well-ventilated area. Space the bars out on wax paper or grease-proof paper to allow the water to evaporate slowly.

The curing process can take anywhere from four weeks to a full year, depending on the type of soap and the desired level of lather and cleansing properties. Yes, it's a long time to wait, but trust me, it's worth it – the soap will improve significantly over time.

Here's a rough guide to the curing process:

I've found that using natural ingredients in my DIY Castile soap is a game-changer for sensitive skin.

This soap is so gentle on young skin that I always make sure to have it on hand for my grandkids.

I've even given it to new parents as a thoughtful gift, knowing they can trust it for their baby's delicate skin.

The best part? It's also budget-friendly, as I don't have to worry about expensive baby soap.

This DIY soap is made from scratch using natural ingredients and expert techniques, making it a great option for those looking for a gentle and effective skin protector.

Additional reading: Homemade Laundry Soap for Sensitive Skin

Making homemade castile soap can be a fun and rewarding DIY project, but it's essential to prioritize safety.

To avoid skin irritation, use gloves when handling lye, as it can cause severe burns.

When working with lye, it's crucial to mix it with water in a well-ventilated area, and never add water to lye, as this can cause a violent reaction.

Always follow the recipe and instructions carefully to ensure the soap turns out correctly and is safe to use.

On a similar theme: Castile Soap and Hard Water

Making soap at home can be a cost-effective venture, especially when you opt for bulk oils from stores like Costco.

The cost of ingredients can vary depending on the type and source of the oils used. Using organic oils, a batch of soap can cost around $26.68.

You can significantly reduce the cost by using bulk oils, which can bring the price down to about $18. This is a substantial savings compared to buying pre-made soap.

The total cost of a batch of soap can range from $20 to $30, depending on the source and quality of the ingredients.

Related reading: Ingredients for Soap Making

DIY projects can be a fun and rewarding way to create something with your own hands. However, they also come with their own set of risks and hazards.

Wearing protective gear is essential when working on a DIY project, especially when using power tools. According to the article, wearing safety glasses can prevent eye injuries from flying debris.

Recommended read: Diy Bar Soap

Make sure to read the instructions carefully before starting a DIY project. A common mistake is not following the manufacturer's guidelines, which can lead to accidents and injuries.

Using the right tools for the job is crucial when working on a DIY project. The article highlights the importance of using a level to ensure that shelves and cabinets are properly aligned and stable.

Don't be afraid to ask for help if you're unsure about a particular task or project. The article suggests seeking guidance from a professional or a trusted friend or family member if needed.

Expand your knowledge: How to Make Diy Soap Bar

To make homemade castile soap, you'll want to have the right tools. A large crock-pot, 6 quarts or larger, is a must-have. I've found that thrift stores are a great place to find one, and they're often just as good as the newer models.

An immersion blender is also essential for making liquid castile soap. I prefer the kind with a stainless blender attachment. It makes the process so much easier.

A reliable digital scale is crucial for measuring both ounces and grams. I've used this kitchen scale, and it's been really good. It's worth investing in a good one, as it will make a big difference in the accuracy of your measurements.

When working with lye, it's essential to use heavy-duty glass or stainless bowls. Aluminum is a no-go, as it can react with the lye and cause damage to both the soap and the bowl.

Here are the essential tools you'll need:

To make a liquid body soap, combine 60-70% liquid Castile soap made with only olive oil with 30-40% liquid coconut oil soap for a bubbly lather.

You can add essential oils like lavender for a lovely herbal scent or citrus blends using lemon and bergamot for a fresh fragrance.

For a simple Castile soap recipe, you'll need to make a 1 lb or 454-gram batch, which will yield six bars if you use the right soap mold.

Make sure to take all the necessary safety measures when handling lye and making soap, as this is crucial for beginners and experienced soap makers alike.

If you're a beginner, it's recommended to stick with a slightly higher temperature when making soap, as this will help you achieve the desired color and texture.

Experienced soap makers can make this recipe at just above room temperature if they choose, but be aware that this will slow down the trace time.

You need to run your modified castile soap recipe through a reliable lye calculator to determine the correct amount of potassium hydroxide (KOH) to use, especially if you're changing up your base oils or quantities.

Good lye calculators like Soap Calc will have an option for 90% KOH, which is a common purity level for KOH flakes. You should use that formulation with a 3% superfat.

Some users have had issues with their castile soap being sticky and melting quickly, even after 6 months of curing time. This is likely due to an incorrect lye calculation, which can be avoided by using a reliable lye calculator.

Test Clarity is a crucial step in ensuring your soap is fully saponified.

After 3 hours, or once the paste looks fully translucent and gelled throughout, it's time to check the soap's clarity. This is a good test of full saponification, and it can be done by measuring out an ounce of soap paste and adding 4 oz of boiling water to it.

Stir gently until the soap paste is totally dissolved, then allow the dilute soap to cool. If it's opaque or if a scum of oils floats to the surface, continue cooking your soap paste for another hour before re-testing.

If the dilute soap is clear, you can proceed with dilution. A clear dilute soap is a good sign that your soap is fully saponified and ready for the next stage.

Making a lye solution is a crucial step in soap making, and it's essential to get it right. You'll need to weigh out the glycerine, water, and potassium hydroxide (KOH) to create the solution.

To make the lye solution, you'll need to mix the water and glycerin first, then carefully add the KOH to the mixture. It's essential to do this step in a well-ventilated area, as the mixture will create a lot of steam.

The mixture will initially be cloudy, but it will clear up as the KOH dissolves. You'll know it's done when it looks grainy and resembles mashed potatoes or applesauce.

If you're using a reliable lye calculator, make sure to account for the fact that KOH is only 90% pure. This will ensure you get the right amount of lye for your soap recipe.

Here's a brief rundown of the lye solution recipe:

Remember to always follow safety precautions when working with lye, and make sure to ventilate the area properly.