Testing my lovely 1956 AGFA ISOLETTE III after I had repaired the seized-up focus -- I used up second half of a cut test film outdated 07/1984 Ilford HP5 and focus is now good but due to light level on this test i could not get full aperture.
yes -- I read that about HC110 but I do not have any so cannot comment on Fog Level reduction -- there IS a formula I have made up supposed to be good for outdated films I found on this site made by some bloke in Czech Republic but I found it needed much longer times than he suggested and it did not have any fog level reduction as far as I could see.