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Assertion (A): Assessing only under the illuminant giving the smallest difference is bad practice.
Reason (R): The product will be seen under whatever light the end user actually has.

  • A.Both A and R are true, but R is not the correct explanation of A
  • B.A is true but R is false
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A

Answer: D

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. Selecting the illuminant that minimises the measured difference conceals the metameric failure rather than revealing it, and the customer will nonetheless see the product under whatever light they have. It amounts to choosing the test that the batch passes, which is not a test at all.

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