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Castor Oil Castor oil is a vegetable oil obtained from the castor bean (technically castor seed as the castor plant, Ricinus communis (Euphorbiaceae), is not a member of the bean family). Castor oil (CAS number 8001-79-4) is a colorless to very pale yellow liquid with mild or no odor or taste. Its boiling point is 313 °C (595 °F) and its density is 961 kg/m3.[1] It is a triglyceride in which approximately 90 percent of fatty acid chains are ricinoleic acid. Oleic and linoleic acids are the other significant components.
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