Prepare the lye solution. Before handling all the ingredients, wear your safety gear (gloves, eye protection, long sleeves). Then, measure the lye and water in separate containers. Slowly add the lye to the water (never the other way around), and stir carefully until the lye is completely dissolved. Set the lye solution aside in a safe place to cool.
Prepare the oils and beeswax. Measure the coconut oil, palm oil, olive oil, and beeswax. Melt them over low heat in a large pot. The beeswax will take longer to melt, so be patient. Once fully melted, remove from heat and allow the oils to cool to 140°F.
Cooling and Mixing. When both the lye solution and the oils have cooled to 120°F, slowly pour the lye solution into the oils. Use a stick blender to combine the mixture. Blend until “trace” is achieved—the soap thickens slightly, and a trail of soap rests on top without immediately sinking.
Add the fragrance and color. Add the fragrance oil and green mica (if using) to the soap mixture. Stir gently by hand to incorporate.Tip: Avoid over-blending at this stage, as the mixture can seize up if you continue to blend with the stick blender. Pour into mold. Pour the soap batter into your prepared mold, smoothing the top as needed. Leave the mold at room temperature to set for 24 hours.
Unmold and cure. After 24 hours, carefully unmold the soap and cut it into bars. Allow the bars to cure for at least 2 weeks in a well-ventilated area before using them for optimal hardness.