Hot Process Soap

If you have the option of doing something complicated or doing something easy, when the end result is the same, what do you choose? The more and more we do around the homestead, the more we are looking for methods to simplify things.

Dara and I have been making cold process soap for many years now. Making cold process soap is easy once you understand the basics, I encourage anyone interested in making it to go for it, here is a post on how. But, it is also a little technical when it comes to temperature. You have to bring your oils up to a specific temperature while simultaneously bringing down you water/lye mixture temperature. They need to both be about 105 F to 110 F when you mix them. We have discovered an easier, less technical way of making soap and get this, you can use it in a couple days instead of 3-4 weeks.

Make sure you wear the proper safety gear when making soap. Use gloves and eye protection always. Bad Dara!

When I heard of hot process soap making, in my ignorance, I just assumed it was the cheater way of doing things, and that making cold process soap was the pure way of doing things. I thought it was akin to extract brewing versus all grain brewing, yeah I said it. Thanks to our friends Heather and Mike, we learned that hot process is just a faster, easier way of making soap using almost all the same techniques.

Disclaimer : Making soap involves handling lye (sodium hydroxide) which is a very strong alkali that is water soluble. When water is mixed with lye it creates a very caustic basic solution. This means it will seriously burn your skin, eyes or lungs if handled improperly. Please do your own research before you make soap. This post is for informational purposes only, not a 'how to' make your own soap.

Here is the quick and dirty of making hot process soap:

• Use any cold process recipe you have. Soapcalc is a great resource for making your own recipes.
• Melt your fats on high in a crock pot large enough for the full recipe with room to mix.
• Once your fats are melted and mixed, add your water/lye mixture to the fats. Another quick Disclaimer: Always add your lye to the water not water to the lye. Never use metal containers to mix your lye in. Use a glass or plastic Tupperware container or pitcher.
• Mix the fats and lye/water mixture with an immersion mixer until you hit a light trace. Trace will happen faster in the process due to the higher heats.
• Once you hit trace leave the crock pot on high and mix the soap every couple of minutes to keep it from burning or sticking to the crock.
• In a short period of time the soap will have a "mashed potato" consistency. Continue mixing the soap every couple of minutes until the soap starts turning translucent. 
• Once the soap is in the "gel phase" or translucent you can add your adjuncts like coloring and essential oils.
• Mix in any adjuncts and spoon into your mold. 

Something else to consider is the flash point of the essential oil you are using. Some oils have a very low flash point, like eucalyptus, which will vaporize at 109 degrees Fahrenheit. If you are using a low flash point essential oil you will have to wait until the batch cools down under the flash point before you mix it in. Here is a good website with the flash points of common essential oils. 

Most of the saponification has already occurred in the crock pot. The high temperatures speed up the saponification process. You are suppose to be able to use the soap in 24 hours. I say once the soap hardens, about 24 hours later, take it out of the mold and cut it. Let the bars cure for a few days at least to harden, or they will melt faster when you use them.

There is something very satisfying about dropping a giant soap log on wax paper...

And here is the final product. Dara put a bunch of spirulina in the large batch giving it a green color and a somewhat ocean like smell. I have been using it for a couple weeks now and it is great. I hope this inspires some of you to start making your own soap.  

Soap Making

Making soap is one of those things most people think is hard to do and not worth the time. Soap is so fast and easy to make, it is definitely worth making your own. If you make your own soap you have control of every aspect from hardness, lather and scent among other things. I hope I can convince you to give it a try.

DISCLAIMER: Making soap involves handling lye (sodium hydroxide) which is a very strong alkali that is water soluble. When water is mixed with lye it creates a very caustic basic solution. This means it will seriously burn your skin, eyes or lungs if handled improperly. Please do your own research before you make soap. This post is for informational purposes only, not a 'how to' make your own soap.

Okay, with that out of the way let me tell you a little bit about the history of soap making.

The earliest known soap making formula dates back to 2200 BC from ancient Babylon. The Babylonians would boil animal fats and wood ash to produce soap for cleaning wools and cotton. As time went on the art of soap making was perfected and most cultures produced some form of soap. Ancient Egyptians around 1550 BC had writings referring to the use of animal and vegetable oils mixed with alkaline salts to produce soap like substances. Around the 8th century soap making was well known in places like Italy and Spain. France started making soap with olive oil instead of animal fat around this time as well. Fragrances were added to soap eventually, and modern handmade soap took shape. 

History lesson taken from http://en.wikipedia.org/wiki/Soap and http://www.soaphistory.net 

Soap is really a salt of a fatty acid. Here is a chemical drawing if you are interested.

Image by http://commons.wikimedia.org/wiki/User:Smokefoot

Soap is simple to understand when you break it down to what you need to make it. Water, lye and fat. Thats it. The ratios and measurements have to be very precise, but if you can bake a cake you can make soap. You need other items to complete the process like a soap mold pictured here, cat approved. I made this mold in about 10 minutes using scrap wood in the garage. You can use almost anything that will hold liquid. However, lye will react with aluminum, magnesium, galvanized zinc, tin, chromium, brass, and bronze to produce hydrogen gas. You should avoid anything made of those materials. I recommend lining whatever you use with plastic wrap, it is much easier to get the soap out when it is solid. 

This is our soap making kit. It all fits neatly into a tote. In order to get accurate measurements of lye, fat and water you will need a scale. I recommend a digital scale like the one pictured here. You will also need an immersion mixer if you don't want to stir for an hour. You can get a cheap one under $20 anywhere, don't use it for anything else once you start making soap with it. You will also need a dedicated pot large enough to mix your batch in safely. You will need a good thermometer as well. I find a decent meat thermometer that can be calibrated works just fine. I always calibrate mine before making soap with a glass of ice water.

Safety is very important. Always wear gloves, long sleeves and eye protection. The mix can splatter if you are not careful with the immersion mixer. If you do get some raw soap mix (not saponified yet) on you,  you should rinse with copious amounts of water. After you get the splatter off of your skin you can then rinse with distilled 5% white vinegar. I know this creates an exothermic reaction, but it will also lower the pH at the burn site. I wash with a ton of water, then treat with white distilled vinegar, then rinse again with water. Of course this is just what I do and not advice, do your own research. When you do, you will find this is a highly debated topic in the soap making world. Some say water, some say vinegar, I say both.  This size pot works for the batch size we usually make. You want the walls to be high enough to catch any splatter. 

We had some friends over for a soap making dinner party and made four batches of soap. The bottom one is a coconut oil soap with black coconut fragrance oil. Above that is an olive oil based soap with sandalwood essential oil and turmeric for color. The green ones are one batch of olive oil soap with tea tree oil and spirulina for color. And the one on the top is a hypoallergenic bar made for a friends wife. That bar is 100% olive oil with no fragrance. 

You can see the great color turmeric gives a soap. There are many things you can add to soap to give texture or color. I have made soap with coffee instead of water, worked great. Spirulina, beet juice, red cabbage water, black walnut hull and many other things can used to give your soap natural coloring. Oatmeal, ground dry herbs and coffee grounds can also be added to soap to give it exfoliating properties. 

This bar is more expensive than the others due to using coconut oil as the main oil. You can use many different fats to make soap. I like using rendered lard. It makes a nice hard bar with good lather. We use many different oils like olive, canola, coconut, and shea butter. I want to get my hands on some rendered deer tallow to make a hunting soap. 

The process we use to make soap is called cold process. You start by figuring out your amounts of water, fats, and lye for the size batch you want to make. We try to base our recipies off how much lye we use. Typically each of our batches uses 5 to 5.5 ounces of lye. We use a website called http://www.soapcalc.net/ Here is a link to their lye calculator. http://www.soapcalc.net/calc/SoapCalcWP.asp 

A quick note. I am purposely not putting a recipe on this post. If you find a recipe please run it through soapcalc first before you try to make it. Soapcalc puts in a idiot proof variable so you do not make a soap that will burn you or your loved ones. This variable is called superfatting. Using a superfat calculation in your recipes will make your soap safe and always on the side of caution.

So, once we have figured out our amounts, we mix the lye and water together in a container. We do this first because mixing water and sodium hydroxide causes a chemical reaction that releases more heat than you need. You will have to let the lye / water mix cool down before you can mix it with your fats. You want to use a heat-resistance plastic or glass container to mix your lye and water. Do not use aluminum! The same rules I described earlier about soap molds apply to your lye / water mixing vessel.

A note of caution: Mix your lye and water outside! The fumes are very bad if inhaled! Make sure you pour your lye into the water not the other way around!

Okay, so once you have mixed your lye into the water, you will have to mix it up with a heat-resistant plastic spoon, the mixture will heat up close to 200 degrees fahrenheit. You need to let this cool down to 110 degrees fahrenheit to mix with your fat of choice.

While your lye / water solution is cooling, heat your fats up in the pot you will be mixing in. You want to bring your fats to 110 degrees fahrenheit. It is kinda tricky to get them both to 110 degrees fahrenheit at the same time, just remember you can heat and cool oil all you want. You really shouldn't heat your lye / water, we never have, so make sure your fats are ready to go when your lye / water solution is at 110 degrees fahrenheit. 

So now that you have both your fats and lye / water mix at 110 degrees fahrenheit you are ready to mix. This is a two person job ideally. One person is ready in safety gear with the immersion mixer. The other person, in safety gear, pours the lye / water mix slowly into the pot (off the heat) while the other person mixes them together. Depending on the recipe, your soap can take 5 to 20 minutes to get to trace. Trace is when you move the mixer through the soap and you see a visible trail left for more than a few seconds. You can also pull the mixer out and if the peak of soap you made takes a while to settle back into the mix you have reached trace.

You have just done something with a fancy name, saponification. Saponification is the process of fats being hydrolyzed into free fatty acids, which combine with alkali to form soap.

Once you hit trace you can add your essential oils and any other adjuncts to the soap. If you are adding oatmeal this is the time. Mix everything together and pour your soap into your mold. Clean your gear and you are done.

Wait about 3 to 7 days depending on the recipe, and remove your soap from the mold. You can cut your soap at this point. Let it sit out uncovered to cure for a couple weeks. Some people will use it before this point but we always err on the side of caution. 

If you have any questions leave a comment. If you know us personally, just ask to come over some night and we will make soap.