Soap nuts is not just soap nuts
Soap nuts are a small yellow-brown fruit around 1-2 cm in diameter; containing a black seed. The shells contain a substance called saponin, usually present in quantities of around 10-15%. Saponin dissolves in water to form suds and can dissolve fats and oils and help to lift grime. Soapnuts are also suitable for use in greywater and blackwater systems.÷