[Blog Post] MSI at last!

[oshfdk]

If this ' scribble' is compared with the visible scribbles on f86v3 and other places, it appears that these other ones may have been written by a pen, as the lines are thin.
For the case of You are not allowed to view links. Register or Login to view. I cannot imagine what kind of writing implement could have created them, apart from perhaps the ones that Koen highlighted in blue.  But they are still too thick / heavy.

I think it's possible that this scribble was initially written over a wet spot on the page, which spread around the ink of its bottom part. Maybe after seeing this mess on the page the whole thing was washed off, explaining no visible traces of ink. Then the page was left to dry off and the scribble never repeated (if it was intentional in the first place). Or this scribble was initially thin, but in the process of removing it the bottom part was left moist with water or solvent for too long before rubbing it off, leaving this wide outline. I have no experience in these matters, but intuitively the first possibility seems more plausible, because it explains both why the scribble looks like this and why it was erased, and in the second scenario I would expect the thin lines to persist inside the smudged strokes.