- NOTE: If you are making these products for sale, good manufacturing practices recommend you wear a hairnet, gloves and a mask. We also recommend a clean apron.
- This project and these instructions have been written for someone who has experience making soap and knows the potential dangers due to working with sodium hydroxide. It will not outline safety methods of working with dangerous chemicals, it is simply a soap recipe for advanced soapmakers.
- Prepare the lye solution by weighing the water and lye into separate containers. Pour the lye into the water, carefully mix in a well-ventilated area and set aside to cool while you prepare your oils.
- Melt the solid oils either by microwave or stovetop. Melt just until melted and no more.
- Add the liquid oils to melted oils to bring the temperature down. Add the essential oil to the oil mixture and stir.
- Once the lye has cooled down to under 90° F, pour the lye solution into oils and blend until emulsified.
- Divide mixture evenly between three pouring containers.
- Add two teaspoons of yellow oxide to one container. Add two teaspoons of yellow oxide plus 1/4 tsp. cobalt blue ultramarine to another. Mix both quickly using an immersion blender to disperse the color evenly. You should now have three bases, one uncolored, one yellow and one green.
- Pour the colored soap into the uncolored base in four spots. Do not mix in.
- Pour the base into your mold. As you pour, the colors will swirl together.
- Allow your soap to harden overnight and unmold the next day. If the soap is too soft, allow soap to harden for 48 hours.
- Cut soap and let cure for a minimum of four weeks.