I had not thought of this. Maybe I could expose a whole roll by loading a reel in the light, but that would not imitate actual usage. Maybe take pictures of the light-table or northern sky to get a controlled dense exposure? Anyway, yes, minimum solution needed would be a good thing to check. I'll think more about how to do this. I suspect the dev-times will increase disproportionately (due to greater exhaustion) as the volume of solution drops, so it'll take multiple attempts (at one roll a pop) to dial-in the correct time. The result would be a few points on an exhaustion-curve, and then we would pick the cut-off point.
Originally Posted by Michael R 1974