Discussion
Match each application with the appropriate Kubelka Munk formulation.
List I
A. Textile dyeing on white substrate
B. Pigmented paint or plastic
C. Transparent ink or filter
D. Opaque coating over a substrate
List II
1. Beer's law in absorbance
2. single constant theory
3. two constant with hiding
4. two constant theory
Answer: A
The choice depends on whether the colourant scatters as well as absorbs. Using the wrong formulation gives predictions that are systematically wrong. The colourant type decides which applies. Scattering colourants demand the fuller theory.
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