It seems that some have concluded that the backing paper is necessarily defective and is the cause of the problem. But is it defective?
No film manufacturer has any control of the film, how its handled, and the environment its subjected to after its packaged and shipped. This includes X-rays and other high-energy radiation used for the inspection of international shipments, or temperatures beyond a safe range. There is no way we can know what the film experienced from the time it left the factory, was shipped to its destination, and until purchase.
https://en.wikipedia.org/wiki/Cargo_scanning
I have used many 120 paper-backed roll films: black-and-white negative, color negative, and color transparency since 1985. I have never encountered the images of characters printed onto the backing paper transferred in some unknown manner onto the processed film. I currently use 120 paper-backed roll films by Kodak, Ilford, and Fuji regularly without such issues.
I dont see any reason cited within the previous posts to conclude that defective backing paper isor is notthe cause of the spurious character transfer as shown in the scans. Clearly there is a problem, but this might have nothing to do with the film and its backing paper, other than the fact that it is the IMAGE of the printed characters that that have spoiled the finished negatives.