Don your protective gear, including gloves, goggles, and long sleeves, and go outside or into a well-ventilted space. Pour the water into a large jar. Then slowly and carefully add the lye.
Stir until the lye has fully dissolved, and the liquid is mostly clear.
Add the turmeric and stir again. Set the jar aside to cool for approximately 20–30 minutes.
Meanwhile, combine all the oils in the base of a crockpot and heat on high, stirring occasionally until just melted (about 20–30 minutes).
While you wait for the oils to melt, whisk the honey and witch hazel together in a small bowl and set aside.
Using your cooking thermometer, check the temperature of the oils and the lye water. You want them to be between 110 and 120°F and within 10 degrees of each other, ideally. When the lye water reaches the correct temperature, add 2 teaspoons of sodium lactate to the lye water and stir.
Then pour the lye water into the slow cooker basin with the melted oils.
Using your stick blender, blend the mixture until you reach a thin to medium trace (the consistency of loose pudding). Due to the large amount of liquid oils in this recipe, it may take several minutes to reach trace. Add the honey and witch hazel mixture, and continue blending for anouther 30 seconds, or until the mixture reaches a medium trace.
Pour the batter into the mold and tap on the counter to help get rid of bubbles. Then cover the mold with plastic wrap and set it somewhere it won’t be disturbed. Honey tends to make soap heat up more than normal, so you do not need to insulate the soap—see the notes for more about this.
Allow the soap to stay in the mold for 2–3 days. Because this is a softer recipe, it may need more time in the mold than normal. Remove from the mold and slice into bars. Allow the bars to cure for 4–6 weeks and enjoy!