Soapnut powder has been in use for almost 3,000 years. And still in many parts of India, soap nut powder is using as a natural soap to remove oil. Soap is a sodium salt or potassium salt of long chain fatty acids having cleansing action in water.\xa0They are using as cleansing agents to remove dirt, oil from the skin and clothes.Examples: Sodium stearate, sodium oliate and sodium palmitate formed using stearic acid oleic acid and palmitic acid.