[Alan Johnson]

Alan;

It also depends on the film emulsion and the amound of bromide in the Rodinal (as well as other antifoggant).

In general, higher surface Iodide would increase apparent sharpness while Bromide or other antifoggant in the developer would tend to decrease apparent sharpness. Older films would be more sensitive to pH and developer concentration as per Crawley.

PE

PE;

I believe the theory is that Bromide liberated during development of a dense area diffuses laterally and inhibits development at area with lower exposure,thereby making the edge of this area still less dense and causing an adjacency effect.Bromide in the developer might swamp this effect.
Is that how your theory of bromide works or is there some different effect?