2.2. Surface treatment
Soapnuts were obtained from the tree of S. mukorossi which
is widely distributed in the southern parts of India. The soapnut seed has an outer protective layer, leathery-skinned drupe with
1–2 cm in diameter, yellow ripening blackish, containing one to
three seeds. This leathery-skinned drupe is used to extract the
saponin. Dried leathery-skinned drupe was powdered by using a
grinder.