How to make Liquid Hand Soap from Scratch

Recipe and instructions for how to make liquid hand soap from scratch using olive oil and coconut oil. Makes over two quarts of natural liquid soap for use in pumps and squeezy bottles for hands, body, and household use.

Washing our hands has never been more important, and many of us have been going through bars and bottles of soap like never before. So much so that people are running out and sometimes finding it difficult to buy. Just yesterday I went into two supermarkets trying to find liquid hand soap to no avail — it’s gone the way of hand sanitizer here, especially the good stuff. I hope you can find it a little easier in your area but if not, you can make liquid hand soap yourself.

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If you’ve made bar soap before using the hot process method, then this recipe will feel familiar. If you’re mainly a cold-process soap maker, the process is entirely different. It takes prolonged heat, a different kind of lye, and a lot more time. At the end of saponification, you’ll have a soap paste that you can store for up to two years, or dilute into liquid soap on the spot. In fact, the relatively small investment in cost will make at least two quarts (two liters) of the best quality natural liquid soap you’ve ever used.

Ingredients to make liquid hand soap

This is a bastille recipe, meaning that it’s at least seventy percent olive oil. I’m using extra virgin olive oil in my batch, which is why the resulting paste and soap have a greenish tinge. If you use light-colored olive oil, then your soap will be cheaper to make and a color similar to Dr. Bronners. The other oil in the recipe is refined 76 coconut oil and it adds the lather and bubbles that olive oil soap lacks.

The other ingredients you’ll need are distilled water, Potassium hydroxide (KOH), and vegetable glycerine. Liquid hand soap has a superfat of just 3% so the glycerine helps add moisture and glide. If you’d like to scent your soap you can also add essential oils, though that’s completely optional. Those that smell nice and that have disinfectant qualities include lavandin, peppermint, and tea tree. At the end of the process, you’ll have a golden liquid soap that’s golden and translucent.

Lye: KOH vs NaOH

I’ve said it many times before, but true soap making is chemistry. Soap is created through a process called saponification in which lye and oils interact in a controlled manner. In cold-process soap making, you use Sodium hydroxide (NaOH) to create hard bars of soap. In liquid soap making, you use a different type of lye called Potassium hydroxide (KOH). Also called caustic potash, it will not create solid soap and instead results in a kind of sticky vaseline-looking paste. Diluting the paste in water creates liquid soap.

Almost all KOH available to the home soap maker is only 90% pure, but you should make sure before you begin. Oftentimes, it will be on the bottle but if not, check with the retailer or look on their website for a document for the lye called an MSDS sheet. It’s a material safety data sheet and it will tell you all about what’s in it, amongst other information. If your KOH is different, make sure to rework the amount you’ll need for this recipe using the SoapCalc. It’s best to always run soap recipes through it beforehand anyway. The field it includes for KOH has a tickbox for if the potassium hydroxide is only 90% pure.

Soap making equipment

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Many of the items you’ll need to make liquid hand soap are the same ones you’d use in cold-process soap making. There’s a list below that includes familiar tools such as an immersion blender and a digital scale. The one real difference is a slow-cooker/crockpot. The process needs steady, indirect, and prolonged heat for the cooking phase and slow cookers are the best tools for the job. After you’re finished making soap, the slow-cooker is perfectly fine to use to make food recipes. You don’t need to purchase one specifically for soap making.

Stovetops can have hot spots and the direct heat on a pan could be problematic. I don’t know of any soap makers that would make liquid soap using this method on a stove, but if anyone did, it would probably require cooking on a double-boiler. If you’ve made liquid soap using a stove or oven, do leave a comment and let us know about your experience.

Making Liquid Hand Soap

Making liquid hand soap has three phases: cooking the ingredients, testing for clarity and completed saponification, and liquifying the soap paste into something you’d recognize as liquid soap. Each step takes time, but especially the first and third steps. When I say time, you’d do well to set aside a weekend for this project. Some liquid soap makers have the experience of being able to make it all in an afternoon, but I don’t think that’s realistic for most. Expect that it will take longer, and take your time while making liquid hand soap and you’ll have better results.

There’s a video pin that shows the various stages of this soap recipe. Have a watch to better understand the process and save it for later on Pinterest.

Most of my soap recipes are for small batches of cold-process soap. It takes about an hour or less to make them and then you forget about them for a month while they cure. Because making liquid soap takes a lot longer, this recipe is relatively larger. That way you invest the time once and have enough soap to last months, or longer.

Your final soap paste should be about 1100 g/38.8 oz/2.43 lbs, and once liquified with distilled water and glycerine, it will be at least double that. In volume measurements, that’s approximately two quarts. You could even have a lot more if you decide to add more water.

As you read below you may feel a little overwhelmed by the steps and testing. In that case, you can also make a simple kind of liquid soap by grating up a bar of soap. I go over how you make it in this piece.

Testing liquid hand soap

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Liquid soap making is much more tricky than cold-process soap making because of the lye. With KOH being only 90% pure, it can cause your soap to be lye-heavy, and harsh on the skin, or overly superfatted and cloudy. You can have everything measured correctly and this can still happen because of the lye’s 10% wild card. That’s why testing your soap is so important, and unfortunately, it needs to be done for every batch of liquid soap you make.

Testing the superfat

If your liquid soap has too high of a superfat, so anything more than 3%, then it will turn your soap cloudy. It can also cause all kinds of issues once you begin adding essential oils and fragrances, and some people have reported seeing their soap separate afterward. Also, too much oil can separate anyway and float to the surface, after you dilute the soap paste in water.

After you think the soap has finished cooking, gently stir a teaspoon of soap paste into half a cup of scalding hot distilled water. Let it sit and dissolve, giving it another stir if it needs help breaking up. Let it cool completely then have a look. If there’s oil on the surface, or if the liquid is milky and opaque then you still have unsaponified oils in the paste. Continue cooking it until it’s much clearer. Just to be clear, milky means you can’t see through it at all. If your liquid is translucent then you’re good to go.

Testing for lye-heaviness

You test for excess lye by checking its pH. Dilute one part soap paste into ninety-nine parts scalding hot distilled water and cool to room temperature. Take the pH using strips (Litmus test papers) and check to see if the soap is between 9-10. Allow the paper to dry completely for the most accurate result.

Liquid soap is supposed to be alkaline, but if it’s above this amount then your soap is lye-heavy. Adjust down to the proper pH by adding diluted citric acid but don’t go below 9 or it will destabilize. Further information on testing liquid soap is over here.

Shelf-life and Preservatives

One big thing you’ll find different in my recipe compared to others is the last stage — I don’t liquefy the soap paste all at once. Whenever you add liquid water to a product, be it food, lotions, or soap, you’re creating an environment that microbes can potentially colonize. The alkaline pH of the soap should deter most, but to be on the safe side, just wait, and liquefy only the amount that you’d use in a month. Alternatively, you can liquefy it all but please add a broad-spectrum preservative to keep microbes out. There are various types to choose from, but one of the best ones is Optiphen ND.

Another thing I need to add, or rather not add. If you wanted to add things like goat milk or honey or other lovely yummy ingredients I’d encourage you to think twice. Because of the water content, your soap will already be a temptation for bacteria. Adding sugar-rich ingredients will tempt them even more! If you use them at any stage of liquid soap making, you will need a preservative to stop your soap from becoming a microbe breeding ground.

Further resources for making liquid soap

If you’re interested in learning more about the art of making liquid soap, shampoo, and other liquid cleansers, check out these resources:

• Liquid Soapmaking: Tips, Techniques and Recipes for Creating All Manner of Liquid and Soft Soap Naturally, by Jackie Thompson
• Making Natural Liquid Soaps: Herbal Shower Gels, Conditioning Shampoos, Moisturizing Hand Soaps, Luxurious Bubble Baths, and more, by Catherine Failor

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Categories: Recipe