Six facts about handmade natural soap

by Liz Beavis

Selling my soap at markets and to friends and family has made me realise how many questions people have about handmade soap.  Here are the answers to some of the common questions I get from people who are interested in using handmade natural soap.

eight acres - six facts about handmade natural soap

1. All soap is made with lye

Soap is made by reacting fats and oils with lye.  Lye is also known as caustic, caustic soda or sodium hydroxide.  If you've used caustic to unblock a drain, that's exactly what I use to make soap. 

Our ancestors used wood ash to make potassium hydroxide lye for soapmaking by percolating rainwater through a barrel of ash from a wood fire.  This was a very inexact science, and so the soap was often very harsh.

These days we can buy very pure sodium hydroxide lye and weigh it out to make sure we use exactly the right amount in our soap.  Most soapmakers (myself included) actually use a little less lye than is really needed, so make sure that the soap has extra fat (this is called superfatting).  This means that handmade natural soaps are actually very gentle.

If you don't want to handle lye (and it has some risks, but can be done very safely), you can buy a "melt and pour" soap base.  This is soap that has already been made with lye, so all you have to do is melt it and pour it into your own moulds. 

2. Handmade soap is different to commercial soap

Occasionally people tell me that the don't like soap, or they can't use soap, but I always encourage them to try handmade natural soap because it is completely different to commercial soap.  Commercial soap is made with cheap ingredients and the glycerin that is also formed when lye is reacted with fats is usually washed out of commercial soap to be sold separately.  Glycerin is one of the constituents of handmade soap that make it so nourishing and gentle on your skin.

Commercial soap often contains colours, fragrances, synthetic detergents and preservatives that can irritate your skin.  Some handmade soap will also contain these things, so make sure that you read the ingredients and try to find handmade natural soap if you have sensitive skin.  I only use natural ingredients for colour and essential oils for scent. 

3. Handmade soap will need to cure after it is made

After I make a batch of soap, it needs to cure for 4-6 weeks, depending on the weather (temperature and humidity).  I usually cut a loaf of soap about 24 hours after I make it and place it on wracks to harden.  It is still a little bit soft and sticky at that time.  After a couple of days it hardens enough that I can wrap it and store it in cardboard boxes.  Over this time it continues to lose moisture and harden.  The longer soap is allowed to cure, the longer it will last when you start to use it.  Unfortunately that means it can be hard to keep up with customer demand and having enough soap ready for markets, as I need to anticipate requirements 4-6 weeks in advance. 


4. My soap is not vegan, but it is sustainable

My soap is all made with beef tallow.  Beef tallow is rendered beef fat - beef fat that I have chopped up, heated until it is liquid and strained into containers, leaving behind the sinew.  I originally used beef tallow because we had a steer killed and I had a lot of fat to use up, so I tried it in soap.  These days I make more soap and I don't have enough beef fat from our property, so we buy it from a local abattoir.  The second time we picked it up, they asked what on earth we were doing with the fat because they usually just throw it out.  They were thrilled to know it was going to be used to make something instead of being wasted.

I had one lady ask at my market stall if I had any vegetarian soap and I explained that they all contain beef tallow, but it is using up a waste product.  When she heard the story, she was happy to buy it, even though she was a vegetarian, it was more important to her that the soap ingredients were ethically sourced. 

I use either 100% tallow or a mixture of tallow, coconut oil and olive oil depending on the soap (coconut and olive oil can add some lather for certain soaps).  I prefer to use tallow as much as possible as it is locally sourced.  The olive oil is Australian, but the cocount oil comes from pacific islands, so its good to support an industry in a developing country.


5. You can use my soap for anything you want

 I do split my soap into categories, but that's just to make it easier for people to chose.  Honestly, you can use any of the soaps for anything you want.  They are all ok as face, body, hair and hand soap.  You can use them on pets, in the laundry and for dishwashing. 

Commercial products tend to be split into categories so that we think we need to buy more products, one for each application.  I used to have a shower full of products - face wash., body wash, shampoo etc, now I just have a bar of soap that does everything.  


6. I only use natural ingredients

 As I mentioned above, I only use natural ingredients in my soaps.  The lye is the only thing that is mass-produced, and that's a good thing, because every soap will turn out safely because I can use exactly the right amount of lye.

The tallow, coconut oil and olive oil have minimal processing.  I also use food ingredients such as salt, coffee grounds and herbs for colour.  And clays and activated charcoal.  I don't use any micas or artificial colours.  I don't use fragrance oils or synthetic detergents. 


Did you have any other questions about handmade natural soap?  Are you a soapmaker yourself?  What do you get asked frequently?



  • Therese Bizabishaka

    I made soap once with olive and coconut oil. It was lovely but I found that it didn’t set very hard no matter how long it cured. I also used a handheld electric disk and found it reached a trace way too fast and was setting as I was trying to pour into moulds. But I would like to try again when I get time.

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