Also known as Castor plant An annual or perennial bush or occasionally a soft wooded small tree. Castor oil consists principally of ricinoleic acid. The oil is used externally to relieve various inflammatory conditions of the skin and mucus membrane. Small quantities of castor seed are used in the villages as a mild laxative for children. The seeds made into a paste or poultice are reported to be applied to sores, boils and gouty or rheumatic swellings. In Veterinary practice, castor oil is a safe and effective purgative for most animals and may be given also to pregnant animals. Castor oil is commonly used for the preparation of hair-oils, hair fixers and aromatic perfumes. It is used as an ingredient in hair lotions and tonics in concentrations of 0.5-20 per cent.