So, the test is done. Now I am thinking - this base fog is there, even on FP4+, that I did not noticed in the first time, probably because FP4+ has higher contrast.
Could it be that this is because of X rays in airport? Film did travel from Hamburg - Amsterdam - Kuala Lumpur - Brunei, and back.
I did used 3 different cameras (Nikon F100, Leica Minilux, Fujifilm P&S), all showing same results.
View attachment 261950 View attachment 261951
airport scanner certainly looking the culprit.
i think lesson here for all of us is - if you travel then do a clip test of leader in fixer first to test for fogging.