In processing a roll of FP4 reversal last night, I realised that I'd not noted down the second exposure time in my intructions. This is in fact 3 mins per side whilst rotating the reel under water.
I should also have noted that it's a good idea not to wear any clothes that you value, as potassium permanganate leaves a brown stain that is impossible to remove!
Another observation is that I've not found using filters to try to enhance clouds to be very successful, as they tend to give an overall mudiness. A pale yellow helps a little, but I certainly wouldn;t use orange with this film/process. However, the process does seem to render cloluds and dramatic skies very effectively anyway.
Finally, whilst I'd say that the success rate percentage-wise is probably comparable with shooting colour transparencies.
Finally (OK, I've already said that but here goes) as with colour transparency film decent light makes a world of difference to the end result.
Steve: you can eliminate the permanganate stain if you dip your clothes in a metabisulfite solution, much like you do with the clearing bath.
This simple device, on the other side, should take care of all stains :whistling:
p-amino phenol hydrochloride, which is the main developing agent in rodinal, tends to have this brown color in the final image. There are several important factors when it comes to final image color. Even a new agent from another factory can cause color-tone shift. Other things as simple as the water you use +++, etc.. The best neutral result "with the developers used": I would stick to a developer [1st & 2nd] with a high concentrate of HQ and sulfite. Most films will have a good 'neutral' with such a developer.
Why does the developing agent stay on the film, after developing/fixing/rinsing ?