How to Make Hot-Process Soft Soap

This step-by-step article explains the process, tools, and benefits of making your own natural, homemade soap using wood ash lye and a slow cooker.

| December 2016/January 2017

Soap-makers love to tell the story of how ancient Romans first “discovered” soap by burning animal sacrifices on Mount Sapo, and how the creeks at the bottom of that mythological mountain were the best places to do laundry. They’ll tell you that the water, ash, and animal fat on those sites accidentally created the soap that filled the creeks. The reality is that the Romans didn’t actually make soap. They traded for it with the Celts, who dominated the market because of their access to abundant limestone and seashells, from which they produced slacked lime to make a caustic soda lye (sodium hydroxide).

After years of professionally making all-natural goat’s milk soaps to sell at our local farmers market, I decided to develop a self-sufficient soap-making process based on ancient techniques. My goals were to make my own lye and to turn kitchen-waste fats into soap. I finally took the plunge — and what an interesting adventure it’s been! I dug through old articles and manuscripts, learned to decipher medieval English, and filled my kitchen with weird, bubbling concoctions. And I wondered how something that seemed so simple could be so challenging.

Don’t let me discourage you. If you’re an outdoor enthusiast, you may have made soap already. Scrubbing a greasy frying pan with campfire ashes doesn’t just scour the dirt away: When rinsed with a little water, the hydroxide salts in the ashes combine with the cooking grease to form a primitive cleanser.

Understanding Soap-Making Basics

To undertake the process of making soap, known as “saponification” (from sapo, the Latin word for soap), let’s first review what soap is and why it works the way it does. Because soap is made from water-soluble bases known as alkalis, it neutralizes acids while retaining its ability to be dissolved in water. More specifically, soap is a surfactant with the unusual ability to diffuse fats and oils into water, which is why it can rinse away oily stains.

Soap is made by mixing dissolved hydroxide salts, generally called “lye,” with fatty acids. To make your own lye that you can use to produce a soft soap, you leach (or drip) water through ashes to dissolve the hydroxide salts. Ashes are highly concentrated minerals of hydroxides, nitrates, carbonates, sulfites, and more. The quality of the lye produced depends on how well the plant material was burned. I’ve found that the more complete the burn (all organic material combusted), the more hydroxides will be dissolved, and the more basic (that is, higher pH) the resulting lye will be. In the case of incomplete burns, such as you’d find in fire pits and fireplaces, you can add lime to the ash to help change carbonates (charcoal) into hydroxides.

My drip lye made from ashes has a pH of about 11, while commercial lye has a pH of 14 — making it 1,000 times more basic than ash lye. This is a big reason why making drip-lye soap is so different from conventional soap making. Because of the lower pH, drip lye is a lot less dangerous to handle than modern commercial lye. As a precaution, though, you should always keep some vinegar handy during soap making because its acid will help neutralize the lye’s base.

mother earth news fair 2018 schedule


Next: September 14-16, 2018
Seven Springs, PA

Whether you want to learn how to grow and raise your own food, build your own root cellar, or create a green dream home, come out and learn everything you need to know — and then some!


Subscribe Today - Pay Now & Save 64% Off the Cover Price

Money-Saving Tips in Every Issue!

Mother Earth NewsAt MOTHER EARTH NEWS, we are dedicated to conserving our planet's natural resources while helping you conserve your financial resources. You'll find tips for slashing heating bills, growing fresh, natural produce at home, and more. That's why we want you to save money and trees by subscribing through our earth-friendly automatic renewal savings plan. By paying with a credit card, you save an additional $5 and get 6 issues of MOTHER EARTH NEWS for only $12.95 (USA only).

You may also use the Bill Me option and pay $17.95 for 6 issues.

Canadian Subscribers - Click Here
International Subscribers - Click Here
Canadian subscriptions: 1 year (includes postage & GST).

Facebook Pinterest Instagram YouTube Twitter flipboard