Folks -- is there a way to assess whether already processed, rinsed, and dried negs have been properly fixed? I recently realized a batch of fix I had been using was pretty depleted, and a few rolls back had some magic shots that I don't want to deteriorate over time. But I don't want to re-fix if I don't have to, since it's a pain. Is there some visual clue, or a chemical test that can be easily applied on a sample neg (in the manner of the Hypo-check for liquid fix)? Thanks anyone/everyone.