Discussion
Match each colourant type with its optical behaviour.
List I
A. Transparent dye
B. Opaque pigment
C. White pigment
D. Black pigment
List II
1. scatters strongly with little absorption
2. absorbs with little scattering
3. absorbs strongly with little scattering
4. both absorbs and scatters strongly
Answer: A
Correct answer: A-2, B-4, C-1, D-3
The two coefficients of Kubelka Munk sort the colourants out. A transparent dye absorbs and barely scatters. An opaque pigment does both strongly, which is why it hides. A white pigment scatters strongly and absorbs almost nothing, which is what makes it white and opaque at once. And a black pigment absorbs strongly and scatters almost nothing.
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