Who Wants to Make Hot Process Soap in the Crockpot?
Hot Process Soap is the easiest method for making soap and shampoo bars that are ready to use the next day. They do not need a 4 – 6 week curing time like CP soap. However they do benefit from curing for a few days. Curing makes the bars harder and last longer.
Why Would You Use Handmade Shampoo Bars?
Handmade Shampoo Bars are an all natural soap for your hair. Made with oils that are good for your hair and without any additives. Who would not want that?
Hot Process Shampoo or Soap – A Tutorial
I am going to show you how to make Hot Process Soap in your crockpot. Hot Process just means you are heating the soap to cook out the lye and putting it through the saponification process in a short time. When you are finished it will be soap. It will only need to cool and harden. You can get a PDF printable of these instructions and recipes here.
You can use Hot Process on any CP soap recipe. It works especially well if you are doing basic bars without any fancy swirling or colouring techniques.
Also please remember to use safety precautions when using lye as it is caustic. I will give the instructions first followed by two recipes, Rosemary Mint Shampoo Bars and Rustic Citrus Bars.
Gather your equipment and prepare your molds. If using wood then line them with parchment or freezer paper. You will need gloves, goggles, scales, glass measuring pitcher and an immersion blender.
Using a scale measure the lye and water. I always recommend measuring all the ingredients by weight including the water and the lye. Pour the lye slowly into the water and stir until dissolved. Cool 15 – 20 minutes.
Measure out your solid oils and butters. Place them in the crockpot and turn on high to melt. Then measure your remaining liquid oils. Once the solid oils have melted, turn off the crockpot and add the liquid oils.
When the lye mixture has cooled for 20 minutes, and is between 100 to 110 degrees F, add it to the oils and fats. Pour the lye slowly and stir the oils to blend. When the two mixtures are combined use your immersion blender and blend alternately with stirring until the mixture reaches trace. It will look like thick pudding. If you using any additives like oatmeal or kaolin clay add them now and blend to fully mix without lumps.
Now it is time to cook the soap. Cover the crockpot with the lid and turn on to low. It will need to cook for about 1 hour. I stir it every 15 minutes. You will see it start to bubble up along the sides. After one hour it should look waxy like vaseline and be the consistency of mashed potatoes.
I use the zap test, but you can also test the ph of the soap to to ensure doneness. Using the zap test, you will put your tongue to a small amount of the soap. If you feel the zing like when you test a battery then the soap needs to cook more. If there is no zing it is done and ready to place in the mold.
If you need to cook it for longer use 15 minute increments or if you are not sure if it is done, cooking for a bit longer will not ruin it.
Once the soap is done, cool slightly and add the essential oils and colorants if using them. I usually do not use colorants. I also added 2 tablespoons of plain Greek yogurt in the Rustic Citrus Soap at this time. It makes the soap smoother and more pourable. Occasionally you will have to add some additional liquid to hot process soap.
Put the soap batter into the mold. I usually just scoop it in. It will be thick and gloppy. Let it cool and harden for 24 hours. Remove from the mold and cut into bars the next day.
Want printable instructions for these recipes? Get a PDF instruction sheet and the recipes here!
Hot Process Soap Recipes To Try!
Rosemary Mint Shampoo Bars
283 grams olive oil
227 grams coconut oil
142 grams sunflower oil
143 grams castor oil
111 grams of lye
301 grams distilled water
1 Tablespoon (15 ml) peppermint
1 teaspoon (5 ml) rosemary
2 pound mold
Note: I have used 1/2 teaspoon of tea tree and rosemary instead of 1 teaspoon rosemary
Rustic Citrus Soap
270 grams palm oil
217 grams sunflower oil
193 grams olive oil
30 grams cocoa butter
56 grams castor oil
100 grams lye
224 grams distilled water
2 tablespoons kaolin clay
2 tablespoons plain Greek yogurt
1 tablespoon each lemon and bergamot essential oil
1/2 tablespoon orange essential oil
2 pound mold or individual molds
**Notes – Always run a recipe through a lye calculator and always use safety precautions when handling lye. Vinegar is good to have on hand when combining lye with the oils in case of any splashes.
If you have forgotten to get your printable PDF of the instructions and recipes, you can get it here!