Black soap and the hammam ritual

Black soap is considered beneficial for the skin in hammam rituals due to its exfoliating and moisturizing properties. 

Exfoliation is important for removing dead skin cells and revealing softer, smoother skin. Black soap contains fatty acids and vitamins that help slough off those dead skin cells without drying or irritating it. 

In addition, the black soap is also moisturizing because it contains olive oil which helps nourish the skin in depth. When used in a steam room, where the heat and humidity can dry out the skin, black soap can help lock in skin's moisture and protect it from environmental damage. 

Finally, black soap is also known for its soothing and relaxing properties. Its sweet scent and use in hammam rituals can help reduce stress and promote relaxation, which is also beneficial for skin and overall health.