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Discussion

All of the following should accompany a reported colour difference EXCEPT

  • A.the illuminant and observer assumed
  • B.the parametric factors applied
  • C.the price paid for the material
  • D.the formula used to compute it

Answer: C

Correct answer: the price paid for the material

What must accompany the figure is everything that would change it if changed: the formula, the illuminant and observer, and the parametric factors. Commercial terms have no effect on the calculation, however much they may bear on what tolerance is agreed.

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