Interestingly, it's possible to formulate a developer so that sloppy measurement of ascorbic acid makes little difference. An example is PC-Sulfite in this posting. For example, if AA is low, then having less secondary dev drops activity, but the rise in pH boosts activity, cancelling each other out, yielding about the same activity.
Originally Posted by Gerald C Koch
Regarding weighing, here's my sermon:
As Jerry said, measuring by weight is more accurate. Electronic scales with .1 or .01 g resolution cost only US$12-15 on amazon. That's the cost of just 3 rolls of film. So there's no excuse to not have one (or two). Search for "scale .1g" or "scale .01g".
Yes, a last-minute addition for single-shot use is what I had in mind. Sorry that I didn't make that clear.
Originally Posted by Bruce Osgood