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A colour difference of zero under one illuminant guarantees

  • A.that the difference is zero under every illuminant
  • B.nothing about the difference under any other illuminant
  • C.that the two samples must have identical spectral curves
  • D.that the pair will match for every observer

Answer: B

Correct answer: nothing about the difference under any other illuminant

Zero difference under one illuminant means the tristimulus values coincide there, which the samples can achieve with quite different spectral curves. Under another illuminant those curves integrate differently and the difference reappears. Only identical reflectance at every wavelength - an unconditional match - guarantees zero everywhere.

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