Discussion
Assessing a colour under two different illuminants is done in order to
Answer: A
Correct answer: detect metamerism between the sample and the standard
A single illuminant reveals only whether the pair matches under that light. Assessing under a second exposes whether the match survives a change of illuminant, which is precisely what metamerism is. Two assessments is the practical minimum, and retailers commonly specify daylight together with their own store lighting.
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