I am developing an accumulation of black and white films since I have not had access to my dark room for a while. I'm doing Fp4 – 120 – taken with a Yashica and developing in the same tank using the equivalent in Rodinal / modern. Everything is fine, 8 movies made (each time new) each time one of the two films comes out with a thin tonal edging throughout the entire film. At first glance the negatives are good, the ribs are subtle. I have been developing my own films for a long time, but I have never encountered this. I do not want it to happen again, so what happened here? This particular movie was waiting 2 years to be developed, the other Fp4 in the tank at that time was "cooler".