Kodak and Ilford are indeed hostage to the companies that make the backing paper and ink. They both run a standard battery of tests but these may not detect a minor change in formulation of the paper or ink. In fact, a slight change that passed the tests might show up in extreme keeping conditions. So, there may be 2 things or more going on.
I'm not excusing anyone, as there is a problem and it should have been found. In addition, all of that bad film should be recalled.
PE
I'm not excusing anyone, as there is a problem and it should have been found. In addition, all of that bad film should be recalled.
PE

