On vellum and drying ink

[lelle]

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