Discussion
Assertion (A): A very large Delta E value carries little useful information.
Reason (R): The formulae were fitted on small differences and do not extrapolate well.
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 formulae were fitted to visual judgements of small differences, so their weighting functions are calibrated for that range. A value of 40 tells you the two colours are quite different, which was already obvious, and its precise size carries no reliable meaning.
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