On vellum and drying ink

[-JKP-]

It's almost an established fact that there are few visible textual corrections in the vms. Would a scribe be able to wipe ink off without leaving traces before drying on 15th century vellum? Like a time limited "undo" in today's terms. If yes then that might partially explain the small number of visible corrections. 
Mods: if this should be posted under questions to experts then please go ahead and move it.
Thanks

It's not an established fact, it's something someone said that has been repeated many times.

There are many mistakes, some corrections and some apparent additions.

Yes, some inks can be wiped off with acidic substances (look at the righthand side and top of Folio 1r). Also the de Tepenec signature at the bottom. Corrections are not always done by wiping away the original, sometimes the shape is carefully amended with additional penstrokes.