- NOTE: 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.
- Put on your protective gear. This is very important since you will be working with an extremely caustic base that can and will burn you if you touch it. Noxious fumes are also released from the exothermic reaction that occurs when you mix the sodium hydroxide with water.
- Wear a face mask or leave the vicinity quickly after stirring the sodium hydroxide into the water. If you get any lye on your skin just wash it off quickly with copious amounts of cool water.
- Prepare the lye solution by weighing the water and lye in two 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 the melted oils to bring down the temperature. Add the fragrance oil to the oil mixture and stir.
- Once the lye water has cooled down to 90°F, pour the lye solution into the oils.
- With stick blender, blend with small bursts and stirring until it is emulsified to a light trace.
- Pour half of the mixture into a separate container. Add pink colorant and use your stick blender to thicken. Pour into the mold.
- Using a tea strainer with charcoal powder, sprinkle a layer of charcoal over the layer of soap in the mold. You don't want it to completely cover the soap or the soap layers will not stick. Make sure you have some bottom layer of soap peaking through.
- Lightly spoon the remaining soap over the charcoal. It will help spread the charcoal into a solid line.
- Use a craft stick or spoon to make fluffy peaks in the soap.
- Allow your soap to harden overnight and unmold the next day. If the soap is too soft to remove from mold, allow soap to harden an additional 24 hours.
- When soap is removed from mold, cut into 1 inch slices. To reduce dragging the charcoal line during the cut, put soap on its side to cut.
- Cure your soap for a minimum of 4 weeks.