Hydrogen cyanide

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Hydrogen cyanide (HCN), sometimes called prussic acid, is a chemical compound with the chemical formula HCN. It is a colorless, poisonous and flammable liquid that boils slightly above room temperature, at 25.6 °C (78.1 °F). HCN is produced on an industrial scale and is a highly valuable precursor to many chemical compounds ranging from polymers to pharmaceuticals.

It is most known as the active ingredient in Zyklon B, a pesticide allegedly used for mass killings during the Holocaust.

See also

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