Ricin is an extremely toxic chemical produced by the seeds (or beans) of the "Castor Oil" plant (Ricinus communis). It achieved notoriety when it was used by the bulgarian secret police to assassinate the BBC journalist Georgi Markov on Waterloo Bridge in 1978<ref>[http://news.bbc.co.uk/1/hi/uk/2636459.stm BBC News: Flashback: Dissident's poisoning]</ref>. | Ricin is an extremely toxic chemical produced by the seeds (or beans) of the "Castor Oil" plant (Ricinus communis). It achieved notoriety when it was used by the bulgarian secret police to assassinate the BBC journalist Georgi Markov on Waterloo Bridge in 1978<ref>[http://news.bbc.co.uk/1/hi/uk/2636459.stm BBC News: Flashback: Dissident's poisoning]</ref>. |