This is kind of a theoretical question because I have never tried a divided developer. As I understand it with a divided developer like Diafine the degree of development is basically built into the process, so you can't really push or pull a film relative to the base performance of that film in the developer. However, could you push or pull the process by using a different concentration of the first solution, the one that holds the developing agent? (I will call this solution the "loading solution".) It seems to me that the degree of development is primarily determined by 1) what chemical is used for the developer in the loading solution (controllable, but for sake of discussion let's not vary this), 2) how much developer is loaded into the emulsion (controllable by the concentration of the loading solution), 2) the diffusion rate of the developing agent out of the film when the film is placed in the alkali solution (not controllable). There are probably some secondary factors as well, such as what is the diffusion time of the alkali into the emulsion after the film is placed into the alkali solution (not really controllable, but probably fast enough to make this a minor variable), what is concentration of the alkali (controllable), and localized developer exhaustion or bromine build up in the highlights (probably not controllable). Out of these it would seem that altering the developer concentration would provide a good way to push or pull the film. If so, imagine keeping several stock solutions of loading solution, each at a different concentration. Then you could push/pull film at will with divided developers. A follow up question on this topic: I understand that Diafine tends to produce flat looking low contrast pictures. Could you use the push process scheme outlined above to increase the contrast with Diafine, probably combined with reduced exposure? Thanks.