Quote Originally Posted by Photo Engineer View Post
You must remember that it is almost impossible to check a tank for Silver content. This is especially true when using the fix for paper.

The most reliable test is "time to clear". Select a 35mm film type (whether you are using paper or not) and cut an unexposed roll into 2" pieces. Using fresh fix, determine the clearing time. Now, every time you make a run, do the same with another piece of film. When the clearing time is approaching 2x the original time, that fix (first or second "tank, tray or whatever") is shot.

This makes the most sense to me. Presumably, the first tray will be shot first. The second tray will become the new first tray and so-on. Is that correct?

Do you see an advantage to two tank film fixing?