82r: A change of plans?

[Koen G]

I also think it's probably the result of damage to the material. It's the special lighting they use for these scans and the result of the pores in the parchment. For example, this is part of the fold between the folios from the same image.

   

Only here we know what kind of change in surface to expect to we can interpret the shadows in the right way. When we see something like that in the middle of a page, it does look like a smudged ink line.