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A metameric pair is defined as two samples that

  • A.match under one condition despite different spectral curves
  • B.return the same proportion of light at every wavelength
  • C.fail to match under every condition of viewing
  • D.are made from identical colourants in identical proportions

Answer: A

The tristimulus values coincide although the underlying spectra do not. Any change of illuminant or observer can therefore break the match. The tristimulus values coincide but the spectra do not. That coincidence is what makes the match fragile.

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