Discussion
The reflectance of a dyeing at a given wavelength depends on
Answer: C
Correct answer: the sum of the K over S contributions of all the colourants present
\[ \left(\frac{K}{S}\right)_{mixture} = \left(\frac{K}{S}\right)_{substrate} + \sum_i c_i \left(\frac{K}{S}\right)_i. \] The reflectance is then recovered from that sum. Additivity in \( K/S \) rather than in reflectance is the single assumption on which the whole method rests.
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