Discussion
Assertion (A): A colour tolerance must state the formula as well as the numerical limit.
Reason (R): Different formulae give different values for the same pair of samples.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the necessity. A tolerance of one unit means something quite different under CIELAB than under CMC, since the latter varies its weighting with the position of the colour. Specifying a limit without the formula therefore specifies nothing enforceable, which is why supply contracts state both, along with the illuminant and observer.
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