Just a bit of musing for a Thursday night here.
Many of us use and like chromogenic B&W negative film (Ilford XP2, Kodak BW400CN, etc.) Ilford, Kodak and Konica all made this type of film, sometimes in several versions.
The principle behind these films is pretty simple -- they are standard "colour negative" films that have only one layer, which has panchromatic sensitization and processes in C-41 to give an essentially "black" dye image. Apparent grain is minimal and the images have a unique and pleasing look.
It got me thinking about why a chromogenic B&W E-6 process slide film was never introduced. Such a film, properly formulated, could be processed in any E-6 line to give neutral monochrome B&W positives. The principle would be the same as the C-41 chromogenic B&W negative film.
I would have imagined that an E-6-process B&W slide film would have been popular in the days when E-6 really ruled the commercial-photography roost.
Anyone know (paging Ron / Photo Engineer) if this was ever considered? Or perhaps were there technical limitations that prevented it from ever happening? (e.g. getting a sufficiently dense, neutral image, sensitization, etc.)