Discussion
The specular component included measurement is preferred when
Answer: D
Correct answer: assessing the colourant itself independently of the surface finish
Including the specular component means the reading depends much less on how glossy or matt the surface happens to be, so two samples of the same colourant with different finishes give similar values. That is what a formulator needs. Excluding it gives the reading that corresponds to how the sample looks, which is what an appearance judgement needs.
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