I have posted some of my wedge spectrograms and described my spectral sensitization experiments here on APUG somewhere. If anyone is interested in them, they may look them up.
Spectral sensitization of a raw emulsion either before or after coating is one of the simplest of operations on an emulsion you can do, once you have a known good dye. Remember, that is a raw blue sensitive emulsion, not one already dyed. It also requires a good dye for the emulsion you are using.