The black horizontal lines were from my misloading the film into the developing reel. It took a whole package of the film for me to realize that there were in fact corner marks (the corners are rounded) and since the film is double sided with emulsion – loading the emulsion is a crapshoot with a medal tank like mine.
Next time – in my plastic tank.
This is stand developing… so Rodinal 1:100 for 10 minutes.
Seems as if I both underexposed and underdeveloped.