You could try Rollei Scanfilm, an obscure unmasked Colour Neg film. Mike Maunder gives an excellent review of it in Ag Magazine, reproduced on the Silverprint website. Just scan it as a B/W neg, but put the scanner on colour mode as well.
The orange dye in Neg films is not technically a layer, the couplers for the cyan and magenta dyes are themselves dyed to correct imperfections in the final print colours, particularly in the yellow-forming blue-sensitive layer. When red is photographed for example, the resulting cyan on that part of the negative is therefore not masked at all. (Don't get me started on Agfacolor!)
Scanners need to and do work with this but it takes longer as the colours are dealt with through complex algorithms in the software rather than by light on paper emulsion.
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