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It is a white poisonous powder
Ricin is one of the most toxic naturally occurring substances. It is derived from seeds of the castor bean plants. These seeds are also used to make castor oil.
In 1978, Bulgaruian dissident Georgi Markow was killed in London using this poison. The poison was injected into him from the tip of an umbrella as Markow was waiting for a bus.
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