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Soap Making 101 - Cold Process Soap


While there are other methods of making soap (hot process and melt & pour), this tutorial will provide a basic overview on how to make your own all natural cold process soaps. It will be added to the Soapmaking page on my blog along with other helpful links and recipes, so be sure to bookmark or pin it for easy reference.

This is not a stand-alone reference. Go to YouTube and watch some videos, do some Google searches and by all means check out great sites like The Soap Queen!

Making soap is one of my favorite hobbies. There are so many ways to personalize a single recipe, that I rarely make the same soap twice! Once you get the hang of it, you will never want to go back to store-bought again!

A few things to note, before we start:

  • Many people are afraid to make soap because it involves handling lye. I know that feeling, because I was the same way! I had my husband do that part at first until I got more comfortable with the idea. Lye requires caution, but you also just need to employ the same common sense you’d use for any potentially dangerous situation such as cooking with a hot stove, or driving down the road in your car. Handle the lye with proper protective gloves and eye wear along with a healthy dose of respect. If you’re careful, you’re not likely to get splashes, but just in case, wear long sleeves. Do NOT involve your children in this activity. There are other fun ways they can “make” herbal soap; check out this post on Making Soap Without Handling Lye.
  • This is just an overview. There are many tutorials and books out there that cover soap making. I have some listed on my Soapmaking Page and a Google search will help you find others. It’s prudent to do your research and view the art from many perspectives before attempting.
  • An accurate digital scale is essential! I used this exact one that was purchased from Amazon.com for five years before it broke (and by that, I mean it stopped measuring in anything but grams – which is still usable, but not always useful for my various projects.) I bought a similar replacement at Walmart that also works great.
  • The links to the digital scale and stick blender in this article are Amazon affiliate links. That means if you click on them and make a purchase, I earn a small commission. This costs nothing extra for you, but does help me afford to keep doing what I do. (Thank you!) :) Having said that though, there’s a good chance you can find suitable items locally as well.

Okay! Now, we’re ready to start! You’ll want to do the following things:


MMS violet soap screen shot

  • (1.) Choose a recipe and run it through a lye calculator, especially if you decide to make changes to it. Each type of oil requires a different amount of lye to saponify (turn into soap.) So, if you’re out of the castor oil called for in a recipe and want to use shea butter instead, you’re going to need a different amount of lye or your soap will end up too harsh or too soft. I like to use theMajestic Mountain Sage Lye Calculator.  Just plug your recipe into the blanks and calculate the lye needed. If you click the screenshot above, you’ll see it gives a range of liquid to use and a range of lye. I use around the 6 for lye and a midway point for the water/liquid (about 15 ounces in the example above.)


Soap Making Ingredients

  • (2.) Assemble your ingredients and safety gear. Lye is sometimes hard to find; my local Tractor Supply store carries two containers at a time and I found a small, local Mom & Pop type hardware store that has a few as well. Make sure the bottle says Sodium Hydroxide and nothing else. You may have to order online. If so, here are two sources: Brushy Mountain Bee Farm and Bramble Berry.
  • I buy my oils & butters from Mountain Rose Herbs, but you can also check your local grocery and health food stores. Don’t forget you’ll need heat & chemical proof gloves and safety goggles along with a kitchen or candy thermometer (a separate one used strictly for soap and not food use.) Wear long sleeves in case any lye splashes on your arms. (This has not happened to me in 10 years of soapmaking, but  it’s always better to be safe than sorry!)


Prepare Molds

  • (3.) Prepare your molds by lining with parchment paper. I have homemade wooden box molds that my dad and brother made for me, but you can also buy them from several places online such as Bramble Berry. I’ve even seen people use rubbermaid containers or heavy duty cardboard boxes. A quick google search will likely give you plenty of inspiration!


Measure Water for Soap

  • (4.) Now, we start measuring stuff. First, you’ll want to measure out your water into a heat proof tempered glass jar, pyrex measuring cup, stainless steel or heavy duty polypropylene plastic (recycle symbol 5) container. [NOTE: I’ve been told that glass/pyrex can weaken over time and shatter, so to be absolutely safe, use one of the alternatives.] Mark this container clearly with a symbol such as a skull and crossbones and don’t put it in your fridge or on the counter where someone might mistake it for a beverage.
  • All soap ingredients should be weighed with a digital scale, this includes your liquids. This picture shows me measuring water for a recipe that called for 20 to 31 ounces of liquid. I decided on a mid-range of 26 oz. You can see I went over .3 ounces. This is okay for liquids, but not okay for oils and most definitely not okay for lye. Those need to be precise. More liquid means your soap takes a bit longer to set up (useful if you’re adding honey or beeswax or other items that speed up things) and less liquid means it sets up and is ready to pour into molds faster.


Measure Lye for Soap Making

  • (5.) Next, measure out your lye. (Make sure you have on those gloves and goggles!) I use an old plastic cup, labeled “Lye” in several places all over with a Sharpie. I pour slowly and carefully then immediately re-cap the lye container and place it far from the reach of children and pets. I take a wet paper towel and thoroughly wipe down the scale and surrounding area in case a tiny grain got loose.  Then I do it again with a fresh paper towel. This may seem over-kill, but I have kids and pets and just one tiny grain accidentally picked up and rubbed into an eye or eaten wouldn’t be cool. I’d rather take a few minutes to be safe now than sorry later.


Pour Lye Into Water

  • (6.) Pour the lye into the water (or other liquid.) I do this in my kitchen sink in order to catch any splashes or drips and just in case I have a “volcano.” This only happened to me once because I tried to pour my lye into a very hot herbal tea. I should have been patient and waited for it to cool first, but did not and had to start all over. So, make sure you pour the lye into water that is cool or no warmer than room temp. Also, you always add the lye to the liquid and not the other way around (the other cause of lye volcanoes.) This mixture shoots up to over 200 degrees F quickly, so use caution when handling. Turn your face away to avoid directly breathing in the fumes. (I keep the window over my kitchen sink opened during this step or work outside on my back deck. If you don’t have proper ventilation, consider wearing a mask.) Stir with a long wooden spoon or rubber spatula until fully dissolved and set in a safe place, out of reach of children and pets, until it cools to about 90 to 125 degrees.


Measure Oils and Butters

  • (7.) While the lye solution is cooling, weigh out the oils and butters called for in your recipe. Place these in an enamel or stainless steel pot, that you plan to use for soap making only. (Do not use aluminum during any stage of the soap making process.) Turn the heat on low and gently heat the oils until they reach 90-125 degrees F.


Pour Lye into Oils

  • (8.) Before mixing, make sure your lye and oils are roughly the same temperature in the range of 90 – 125 degrees F. I sometimes add an ice cube or two to my lye solution to cool it faster (remember the water amount can be adjusted by this small amount) or set my pan of oil down into a sink filled with a few inches of water and ice cubes if it needs cooling. Temperature is a subjective, personal preference that varies between soap-makers. Some will only mix at higher temperatures than I list while others let everything sit overnight and mix the next morning at room temperature. The main thing is that your lye solution and oils are about the same temperature range when you mix them. Once the desired temps are reached, slowly drizzle your lye solution into your pot containing oils and butters.


Blend until Trace is reached

  • (9.) Using a stick blender, start combining the lye solution and oils, stopping to occasionally stir and check consistency. It only takes a few minutes for most of my recipes to reach “trace” – which means when you drizzle a small bit of the soap mixture over the surface, it will leave a faint pattern or trace before sinking back into the mixture. (Click on the picture above, which demonstrates this.) My first several batches of soap were made without using a stick blender. Every single one failed. I highly highly HIGHLY recommend using one. I have one by Cuisinart that I’ve had for many years. Make sure you use it strictly for soap making and not for food use. Once trace is reached, you’ll add any extras such as honey, oatmeal, natural colorants, and essential oils and blend for just a bit more until they are all incorporated.


Quickly pour soap into molds

  • (10.) Working quickly, pour the soap into your prepared molds, smoothing the top with a rubber spatula or wooden spoon. Pick up your mold and give it a few sharp raps on the table or counter surface to help get rid of any little air bubbles that may have formed. The soap is still caustic at this point, so keep your gloves on and be aware that the mixture can burn your skin. If that happens you can rinse thoroughly with water or pour vinegar over the spot to offset the alkalinity (or both.)


Cover soap and don't disturb for 24 hours

  • (11.) Cover with the mold top, then several layers of blankets and quilts to make sure the soap is well insulated and retains the heat needed to finish saponifying. Leave undisturbed for about 24 to 36 hours.


Cutting Cold Process Soap

  • (12.) Unmold your block of soap. You can cut it into bars right away or later. I like to do it fairly soon after making, so that the soap is still soft and easy to cut. Use a ruler and a knife to cut into desired sizes. Let the bars cure in the open air on pieces of wax paper or brown paper, turning occasionally, for about 4 weeks. Since I almost always superfat my soaps, (which means I put in extra oils that the lye does not transform to soap), they are gentle enough to start testing after three weeks. I always test on myself a few days before trying out on other family members, just to be safe.


This wraps up my post on the basics of soap making. Remember, this is just an overview! I did not cover every tiny detail there is to know about soap making because that is impractical for the space limitations of a single blog post. Be sure to check out the links and books on my Soapmaking Page so you can research more thoroughly before you make your first batch.


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