If you have a spectrometer, the kind of thing I'd like to see is processed B&W film transmission spectra. Like we have all seen that certain films are more blue or pink after processing. Interesting to see the magnitude of that film base tint. Also, how about stained negatives...would be interesting to see how the spectra differs for different types of staining developer.
Here are the spectral sensitivities of Ortho, Pan and IR films.