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Ethyl iodoacetate

By 2018-08-30T17:05:00

Nurses from the House of Lords Red Cross Detachment wearing gas masks,

Source: © Daily Herald Archive/SSPL/Getty Images

A tear gas used by the British army in the first world war, picked, in part, because of our access to seaweed

A tear gas used by the British army in the first world war, picked, in part, because of our access to seaweed