Thanks, Ayelet.  I think that is a problem.  If I had 5 different grains and mixed only some, I’d need to create and check the mixture against 5 models to determine composition?  If each grain had a unique spectral signature, I would expect a that single good model where each grain is well characterized should suffice to determine the composition of a mixture.  Think of a simple mixture, say baking soda and wheat flour. Or ethanol and water. Each should be clearly distinguishable in a spectrum.  The respective fraction of each component should be determinable from a single analysis by the relative peak (or peaks) areas.


I cannot believe I am the only person interested in such a capability, and I suspect the modeling is not too complicated.  Can Consumer Physics consider working on this?