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Ancient world
xThe Ancient Egyptians already knew about the effects of hydrocyanic acid. They prepared a drink of bitter almonds called "eternal silence".
1782
Scheele, a German scientist, discovered hydrocyanic acid in 1782 when reacting potassium ferricyanide with dilute sulphuric acid. More detailed investigations of the substance were conducted by Berthollet (1787) and Gay-Lussac (1815)
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