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The single most important thing to agree before measuring colour differences commercially is

  • A.the price to be paid for acceptable material
  • B.the brand of instrument each party will use
  • C.the time of day at which the measurements are to be made
  • D.the formula, illuminant, observer and tolerance values

Answer: D

Without agreement the two parties compute different numbers from the same material. Disputes then become impossible to settle on the evidence. Both parties must compute the same number. Disputes are otherwise unresolvable on evidence.

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