Castor Oil 250ml - KTC - The castor oil is obtained from seeds of the castor or Ricinus communis. The oil has a transparent to yellowish colour and is viscous. Castor oil is non-toxic and contains no toxic ricin, which is found in the seeds. Since antiquity, it has been used in Egypt in the medical field. It was also used as a fuel for oil lamps. Likewise, in ancient Greece the use as an internal and external cure was customary.