Mike, the only company with Printing Ink issues is Kodak. Pan F has its own quite different problem which can initially look similar to Tommy's example,
I realised I'd made a big mistake about 2 years ago, I'd put a roll of Pan F through my Microcord and used most of another about 18months before planning to process them together. When I processed the films they were toast, I'd expected as much because Pan F has extremely poor latent image stability, Ilford do warn of this "Important Note: Once exposed, process PAN F Plus as soon as practical – we recommend within 3 months". It's very unusual for me to leave films unprocessed long, usually developed the day shot/finished or if away within a couple of weeks, as it happened these negative were unimportant more about testing the camera/film.
Agfa used a chemical additive to overcome this with AP/APX25 when the chemical went out of use in a different industry it went out of large scale production, it was too costly to reformulate the film as sales were very low compared to APX100and the investment needed was too high.
Ian