Discussion
Consider the following statements about pigmented systems.
1. Scattering governs opacity and hiding power.
2. Absorption governs the hue and depth of the colour.
3. A single coefficient describes both adequately.
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 separate the two optical roles: scattering, largely from the white pigment, determines opacity and hiding power, while absorption determines hue and depth. Statement 3 is precisely why single constant theory fails for pigments - the two must be modelled separately, which is what two constant theory does.
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