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Discussion

A colour difference may be perceptible without being unacceptable because

  • A.perceptibility depends on the illuminant alone
  • B.commercial tolerance exceeds the threshold of visibility
  • C.instruments cannot reliably detect differences that small
  • D.acceptability is judged only by instruments

Answer: B

Buyers accept differences they can see if the difference is small enough. Setting tolerances at the perceptibility threshold would reject most commercially satisfactory production. Buyers tolerate differences they can plainly see.

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