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The canary girls were the United Kingdom's female trinitrotoluene (TNT) shell makers of World War I (1914-1918). The nickname arose because exposure to TNT is toxic, and repeated exposure can turn the skin an orange-yellow colour reminiscent of the plumage of a bird, the canary (which itself was used by miners to detect toxic carbon monoxide in coal mines.)The canary girls were also referred to by the n

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