Can you provide spectral reflectance values for the Farnsworth-Munsell 100 Hue test?
We don’t have them, but I recall someone asking this question recently and the best I could find on the internet was this reference www.ncbi.nlm.nih.gov to a paper that did eigenvector analysis of the reflectances. I haven’t looked at the paper itself, but the abstract says they measured the reflectances and even the eigenvector analysis (if it is fully presented in the paper) might let you make reasonable reconstructions.