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Subject: What happens to neg quality as dev becomes exhausted?



I want to shoot some resolution shots to test my LF lenses. If I use
D-76 that has been spent developing other negatives, what can I expect
from the negatives developed beyond the rated capacity? The qualities
in a negative that the developer impacts are contrast, maximum density
and accutance (maybe more?). I am guessing that as developer action
declines, max density suffers, and therfore contrast. Could more
frequent agitation or increased temperature help this? The point is
avoid creating more water pollution for negatives that will never be
printed, but if using old developer makes it impossible to judge the
quality of the image, then it will not serve as a good indication of
lens quality. Also, what is the dark precipitate seen in used developer
that has sat for a while?

Thanks,

Scott


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