Discussion
Assertion (A): Changing colour difference formula requires the tolerances to be revisited.
Reason (R): The acceptance regions differ in shape as well as in size.
Answer: A
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. A tolerance of 1.0 in \( \Delta E^*_{ab} \) defines a sphere, while the same number in CMC or CIEDE2000 defines an ellipsoid oriented differently at every point in the space. Carrying the number across changes both which batches pass and which direction of error is treated most severely.
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