How does one go about using use color measurements to determine the concentrations of colorants/dyes in aqueous solutions?
This is essentially the topic of the area known as color, or colorant, formulation. The relationship between colorant concentration and spectral transmittance (in this case) is characterized for all colorants of interest and then an appropriate model (the Beer-Lambert Law in this case) is used to predict the characteristics of mixtures. Given a mixture of known colorants (unknown concentrations), it is possible to figure out the concentrations by inverting the model. Berns’ text, “Principals of Color Technology, 3rd. Ed.” provides a good overview of these procedures.
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