It's no problem to develop most b&w films into slides, but the process is a bit tedious:
- primary developer
- water rinse
- bleaching bath (potassium permanganate plus sulphuric acid)
- water rinse
- clearing bath (sodium bisulfite)
- secondary exposure (five minutes under a 100W bulb in a water bath)
- secondary developer
- stop & fix as usual
A rotary processor helps, because the process is quite stressful on the emulsion and requires constant temperatures.
The chemicals are sold as a kit, e.g. there is a Foma slide kit sold by Fotoimpex/Retrophotographic/whatever their dependence in the US is.
It helps if you have a film that doesn't have a dense greybase. Agfa APX was great, Acros is OK, so are FP4/HP5. Efke films aren't bad either. Foma R100 is a specialised black & white slide film that produces great results. Lucky works, too, even though I don't like the look of the film either in positive or negative processes. Agfa Scala was great, but is apparently phased out.
Philipp