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An unconditional colour match is one in which the two samples have

  • A.identical colourant formulations in every respect
  • B.identical spectral reflectance across the whole visible range
  • C.identical tristimulus values under one single chosen illuminant
  • D.identical appearance to a single trained observer

Answer: B

Only a spectral match survives every change of illuminant and observer. Achieving one usually requires the same colourants in the same proportions. Only identical colourants give identical curves. Substitution therefore risks a metameric result.

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