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Metamerism assessment by eye should use

  • A.a single illuminant chosen for convenience
  • B.no illuminant, viewing the samples in darkness
  • C.an illuminant selected to minimise the visible difference
  • D.at least two illuminants of different spectral character

Answer: D

Switching between them reveals a pair that separates under one condition. A single illuminant conceals exactly what the test is meant to find. Switching between them exposes the separation. A single illuminant hides the failure.

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