Shave Soap

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https://www.elementsbathandbody.com/shaving-soap-recipe/
Step 1 – Melt the Butters and Oils
Combine the stearic acid, shea butter, palm oil, coconut oil, cocoa butter, and castor oil in your slow cooker. Turn the cooker on to high and allow your oils to melt completely. This will take about 30-40 minutes depending on how hot your slow cooker is. Stearic acid takes a long time to melt, so be patient! While your oils melt, add the potassium hydroxide and sodium hydroxide into the distilled water in a funnel pitcher. Work in a well-ventilated area. Stir until dissolved. (Note: add the lye to the water, not the water to the lye. The mixture will get quite hot!)

Combine the essential oils, glycerin, and yogurt in a small glass bowl or cup.

Step 2 – Bring the Soap to Trace
Pour the lye solution into the oils. Stick blend on high. The mixture will seize up into an applesauce consistency. After a couple minutes, the mixture will have the texture of soft mashed potatoes. After about 10 minutes of stick blending, the mixture will smooth out and have the appearance of cake mix batter. The soap base is now at trace.

Step 3 – Cook the Soap Base
Cover the soap and cook on high for 45-60 minutes, stirring every 20 minutes. To stir the soap, use the spatula to fold the soap to stir it. The soap will be a very thick paste, so just do your best to stir it. When the soap takes on a glossy, slightly translucent condition, test the soap for doneness. The easiest way to test the soap is to take a tiny bit of the soap on a small spoon and place it on your tongue. Undercooked soap will “zap” your tongue like a battery. Cooked soap will just taste slightly bitter. Alternatively, you can test the soap with phenolphthalein drops or a pH Meter by taking 1g of the soap and dissolving it in 99g of distilled water and inserting the probe. The soap will have a pH at or below 10.

Step 4 – Finish the Soap
Turn off the slow cooker. Allow the soap to cool to 175o, or below. Stir in the yogurt mixture. The soap will loosen up a little. Working quickly, spoon the soap into each of the jars, or mold. Keep the soaps uncovered for 48 hours to allow them to dry out. The soaps are safe to use right away, but will last longer if you let them cure for a couple of weeks.