Discussion
Assertion (A): A colour difference value should be quoted with the formula used.
Reason (R): Different formulae give substantially different values for the same physical pair.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. The same measured pair can give 1.8 by \( \Delta E^*_{ab} \), 1.1 by CMC and 0.9 by CIEDE2000, because each weights the components differently. A figure quoted without its formula cannot be compared with any other, and a tolerance quoted without one cannot be applied.
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