Discussion
Colour difference values for very dark samples are prone to error because
Answer: B
Correct answer: small absolute measurement errors produce large lightness differences
\( L^* \) is a cube root function of the luminance factor, so its slope is steepest near black. A small absolute error in reflectance at the dark end therefore produces a disproportionate change in lightness, and dark shades are correspondingly harder to control - a fact reflected in the wider tolerances usually agreed for them.
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