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Discussion

Non-linearity between K over S and concentration at high depth arises from

  • A.the observer functions failing at high concentration
  • B.the illuminant changing with the depth of shade
  • C.dye aggregation and saturation of the substrate
  • D.errors in the spectrophotometer at high reflectance

Answer: C

The simple proportionality breaks down as the substrate approaches saturation. Software applies a correction function fitted to the calibration data. Linearity fails as the substrate saturates. A fitted correction restores the prediction.

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