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Opacity in a pigmented system is controlled principally by

  • A.the amount of scattering pigment such as titanium dioxide
  • B.the amount of the absorbing colourant present in the mixture
  • C.the thickness of the measurement aperture used
  • D.whether daylight or a store lamp was assumed

Answer: A

Scattering rather than absorption prevents light reaching the substrate. Two constant theory handles the two coefficients independently. Scattering rather than absorption gives opacity. The two coefficients act independently.

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