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All of the following must be stated with a CIELAB value EXCEPT

  • A.which light source the figures were computed for
  • B.the standard observer assumed
  • C.the white point used for normalisation
  • D.the name of the colourant in the sample

Answer: D

Correct answer: the name of the colourant in the sample

A CIELAB value is computed from the reflectance by weighting with an illuminant and an observer and normalising to a white point, so all three of those must be stated for the figure to be reproducible. What the sample is made of does not enter the calculation at all.

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