my suggestion about the author of MV

[ReneZ]

There is no statement in the McCrone report (I have a full copy) hat the ink was added not long after the vellum was made.

This statement was unfortunately made during a press briefing (at which I was present) by a representative of the Austrian TV (ORF). It is, however, not based on any scientific analysis.

At the same time, it is a highly reasonable assumption.

Only the summary report was published on-line by the Beinecke library before. It is indeed no longer there, but this looks like a 'standard' web re-organisation.  If I find it again, I will post the link here.