So I'm finally back to testing fuji Mi-Dup xray dupe film for enlarged negatives. It's strange to work with a film which decreases in density with more exposure! But the strangest thing was that when the film hit the fixer, there was a very noticeable increase in density. At first I thought there was something wrong with the fixer, but even making fresh stuff resulted in the same bizarre phenomenon. I was using Polymax T developer 1+3, kodak stop and ilford rapid fix 1+9.