14-04-2026, 03:47 AM
(13-04-2026, 08:36 PM)oshfdk wrote: You are not allowed to view links. Register or Login to view.If we assume iron gall ink for the folio numbers, this type of ink binds to and reacts with the vellum. The part of ink that was on top of a grain of some mineral had nothing to react with, could have dried out and turned to dust, leaving an impression of paint added after the ink.
Iron-gall ink not only binds to the vellum, but turns into an insoluble polymer as the iron in it oxidizes. If the ink had been applied over the paint, the paint pigment particles would have been embedded in that polymer. I suppose that it is not what Rene and others saw when they looked at that page number with the microscope.
All the best, --stolfi