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Reporting a colour difference as a single number without context is

  • A.acceptable if the value is below one
  • B.inadequate, since the formula and conditions are unstated
  • C.sufficient, since Delta E is universally understood
  • D.preferable, since any additional detail confuses the reader

Answer: B

Correct answer: inadequate, since the formula and conditions are unstated

A difference figure means nothing without the formula, the illuminant, the observer and any parametric factors applied, because each of those changes the number. A reader given the value alone cannot compare it with another value or apply it to a specification - and the smallness of the number does not repair the omission.

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