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Two constant Kubelka Munk theory is required when

  • A.the substrate is perfectly white and entirely non-scattering
  • B.only a single colourant is being used in the recipe
  • C.the sample is transparent rather than opaque
  • D.the colourants scatter as well as absorb, as pigments do

Answer: D

Paints and plastics contain scattering pigments and require both coefficients. Determining two constants demands considerably more calibration work. Pigments scatter as well as absorbing. Two coefficients are needed for each of them.

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