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Using a digital scale, measure out the lye and water in separate glass containers. Combine them by adding the lye to the water. (Remember: snow floats on the lake.). Stir until the lye dissolves. The temperature will shoot up. Place this in a safe place to cool.
While the lye solution is cooling, measure out the oils and butters and combine them in a large stainless pot. Melt them over low heat and heat them up to 130-140 degrees. Set them aside to cool.
After 2 hours, check the temperature of both solutions. They should be around 110 degrees. (A range of 100-120 is fine.). If not, allow them to cool longer.
Prepare your mold and measure out any fragrance or color you will be adding. (For best blending of colors, mix some color into a few drops of melted oils.). If using sodium lactate, add it to the lye water at this time.
Pour the water and lye solution into the pot with the melted oils. Blend with a stick blender until thin trace is reached. The soap batter will noticeable thicken and a trail of soap will sit on top of the liquid rather than immediately sinking in. (This will take about 1 minute.). Add the color and fragrance and stir by hand.
mmediately pour the soap batter into the mold. Place in a turned off oven or wrap with blankets to insulate the soap.
After 24 hours of curing, unmold and cut into bars. The bars may seem slightly soft but will harden considerably during the curing process. Allow to cure at least 3 weeks in a well-ventilated place.