The uniform of the British police, the
hospital staff, the army and the industrial
workers was dyed with indigo. This
inspired the term 'blue collar' workers.
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The blue serge uniforms worn by the British police force and hospital staff, as well as military personnel and workman's clothes worn by millions of people were dyed by indigo dye, the term blue collar worker has been inspired from this aspect . ... in stale urine in Europe as a pre-industrial process for dyeing in earlier times .
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