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A colour difference calculated under one illuminant may differ from that under another when

  • A.the observer has normal colour vision
  • B.the pair is metameric rather than a spectral match
  • C.the reflectance curves of the two happen to coincide
  • D.the instrument used is the same in both cases

Answer: B

Metameric pairs match under one illuminant and separate under another. Calculating the difference under several illuminants exposes this directly. A metameric pair separates when the light changes. One illuminant would conceal the failure.

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