Chazzy said:
... assuming that trays are rinsed out thoroughly after use?
For straight processing, develop, stop, fix 1, fix 2, rinse,
hca, rinse, some solution is transferred from one to the other.
If repeated use is made of the same solutions a build-up of
the previous will be found in the next. But who complains?
Film and paper continue to turn out fine.
The moral of the story, don't sweat it. But if you still
worry try my single tray - one shot way of processing.
Develop, fix, hca; single fix archival results and great
chemical milage. Dan