..not to despair. We are working on a possible "dr5-kit". Other than those close to the lab, this is the 1st It is mentioned here. If it's feasible, it might happen. dw
Originally Posted by Rudeofus
I can hardly blame DR5 for not giving away his trade secrets, quite to the contrary, I'm impressed he responded here at all.
I do have a theory about Rodinal and brown silver: in the FD step you have a strong solvent which completely removes tiny grains but leaves not so tiny grains behind as tiny grains. Tiny grains would normally either
not develop at all because they are very insensitive to light
be dissolved away by any moderately solvent developer
Now all of a sudden we have a strong re-exposure step which makes sure these tiny grains are exposed and will develop, too, and we have a more or less non-solvent developer (Rodinal) which happily develops them into tiny (and therefore brown) Silver crystals. DR5's suggestion to use a developer high in HQ (i.e. high contrast, i.e. won't develop tiny grains) and high in Sulfite (i.e. dissolves tiny grains before they develop) would certainly point in that direction.