Weigh separately the sodium hydroxide (in a small dry container) and water (in the pyrex beaker)
Slowly pour the sodium hydroxide into the water in a well ventilated place and mix with the whisk until the sodium hydroxide is completely dissolved (this solution is called lye). Be careful, as this will become quite hot while dissolving! Set aside to cool down.
Weigh the solid fats (coconut oil and shea butter) and slowly melt them in the cooking pot over low heat.
Weigh the olive and neem oil in the plastic bowl.
Weigh neem powder in a small container and reetha and hibiscus powders in another container.
Weigh essential oils.
Pour the melted fats into the olive oil, mix well and check the temperature.
When the temperatures of the oil mixture and of the lye both reach 35-50°C (ideally 40°C) pour the sodium hydroxide solution into the oils and start blending with short bursts.
When the mixture reaches a homogeneous and slightly creamy texture (trace), it means that the saponification reaction has started.
Separate the mixture into two parts and add the neem powder in one part and reetha and hibiscus powder in another part. Blend both separately.
Pour first part (with neem powder) and then slowly pour the second part (with reetha and hibiscus powders) on top.
Cover the mould and leave to rest for 24-48 hours.
When the soap feels solid enough, unmould it and cut it into pieces as you like.
Place the soaps in a dark, well ventilated area to cure for at least 4 weeks.
Please be extra careful when handling sodium hydroxide (caustic soda, NaOH), as it is a very alkaline (basic) ingredient and can cause burns on your skin. Wear gloves during all the making process.