I bought a box of slightly expired Rollei Infra-Red film (new stock not available) and loaded up some film holders. I have since used some of the film and when I went to load the empty holders with some more Rollei IR I could not find a notch code.
I know the film I had previously loaded had a notch code (small semi circle) but I have felt all over the edges of the film and there was no notch code to be found. I then decided to waste a sheet of the film to see why I was unable to find a notch, and when I looked at the sheet there was no notch on it.
I processed 4 sheets of the film this evening and noticed that whilst there was a nice semi-circular notch on 2 of the sheets (from the same film holder I quess) the other two sheets had barely a mark on them. I can only presume that the film slipped out of registration from the notching machine.
I loaded up 6 film holders with film the first time and have also wasted a sheet, so I have 12 sheets remaining that I just cannot work out how to find out which is the emulsion side.