This isn't true, one can get perfectly nice and bright bw slides without using silver halide solvent. It's my experience with Tri-X super 8. However, some films require some silver halide solvent, in my case it is the Fomapan R. It really depends on the film (how it is rich in silver, for example), and on the water you use (if tap water, then it is different everywhere ).
Originally Posted by Relayer
I use around 5g/L of KSCN, but that means nothing : you have to find out your own amount to add to make it work. Don't add too much otherwise you will lose density. Experiment.