Quote Originally Posted by olehjalmar View Post
In contrast, a fill, agitate, and dump cycle is easier to analyze, since the agitation will ensure that the thiosulfate is more or less evenly distributed in the water at any time.
But even then, as others have noted you've got to account for the rate at which the fixer diffuses out from the emulsion into the solution. It seems like there are an awful lot of variables involved if you wanted to model that process theoretically, and I have more faith in the empirical results.

On the bright side, most of my photos pretty much suck and it might be an artistic mercy if they decay over time anyway. Unfortunately it sounds from this thread like my descendants are likely to be stuck with them. ("Wow, Great-Grandpa couldn't focus his way out of a damp paper bag, could he?" :-)