Sorry for insisting, but I think that the evidence for the painting being later than the foliation is quite strong.
(29-09-2025, 02:04 PM)LisaFaginDavis Wrote: You are not allowed to view links. Register or Login to view.I don't see any evidence to suggest that the pigment is later. Recent XRF elemental analysis on ff. 1r and 1v did not find any evidence that the pigments were later
XRF only tells the
chemical elements in the sample. It does not tell how those elements are combined, namely which
chemical substances are present.
All that XRF did on those two pages was show that there were no significant amounts of any
chemical element (like titanium, chromium, cadmium) that began to be used in pigments only in the era of modern chemistry, from the 1700s on. It could not, and did not, tell anything about the date when the pigments were created or applied to those pages. It id not even rule out a 20th century date for the manufacture and painting.
Quote:[except for the marginal letters] which are zinc-gall and therefore confirmed as post-medieval.
There is no such thing as "zinc-gall ink". Zinc does not make a colored compound with tannin, and does not oxidize after application (which is what makes iron-gall ink darker and waterproof)
What the McCrone Inc. report found was that there was little iron in the ink of those letters. They took one tiny sample (sample 20) from those letters, and got XRF spectra of four microscopic particles included in that sample (pages 42-45 of the attachment with the spectra). In three of the spectra there were very small amounts of iron (0.8%, 0.3%, 1.9%), comparable to those of many other elements that do not belong in iron-gall ink (magnesium, calcium, aluminum, silicon, phosphorus, sulfur, chlorine, potassium, calcium, copper). In other words, the iron content was no more than what would be expected from "dust of the centuries". The fourth particle from that sample had a larger amount (7%) of iron, but that too was comparable to those of calcium (6%), silicon (6%), potassium (3%), aluminum (2.6%), and even the infamous titanium (2%).
Zinc occurred only in the first of the four particles, at estimated concentration of 0.21%. Less than copper (0.23%), iron (0.82%), calcium (1.7%), potassium (1%), sulfur (0.7%), silicon (3%) aluminum (1.1%), magnesium (0.4%). Again, the best conclusion is that the particle came from the vellum coatings or from dirt collected over the last 600 years.
In all four particles, the most abundant element was carbon, consistently 50-60% in weight. The next most common was oxygen: 30-40% on the first three particles, only 14% in particle 4. And carbon is the lightest element measured, so in terms of the number of atoms it was much higher: 73% in particle 4, against 14% of oxygen.
While the carbon and oxygen in the first three particles could have come from tannin, gum arabic, or other iron-gall ink components, the oxygen number for last particle is too low. The most likely conclusion is that the marginal letters on You are not allowed to view links.
Register or
Login to view. were written in lampblack (china, india) ink, which is just carbon with a bit of binder like gum arabic; not "something-gall" ink.
But "everybody knows" that dark ink on vellum is "always" iron-gall ink. So it "had" to be "low-iron iron-gall ink"...
Quote:There is no question that the order of application [on f42r] was pigment, upper-margin stain, foliation. The green is offset from the damp of the stain,
Agreed, definitely the stain is later than the painting.
Quote:and the foliation wasn't damaged by the stain elsewhere.
But the foliation, which was meant to be permanent, would have been done in (true) iron-gall ink,
because it is wear- and water-resistant.
Quote:I haven't looked at f.42 under a scope, but I would be extremely surprised if the green was on top of the folio number.
But several people who have looked at the folio number with a microscope (not just Rene and others at the workshoop, but, now I see, even the McCrone guys) all agree that the paint is
over the ink.
(30-09-2025, 12:10 AM)ReneZ Wrote: You are not allowed to view links. Register or Login to view.[a possible explanation for why the pigment to appear to be over the inl is that] the paint lies on top of the parchment while the ink goes inside (mostly).
On paper, ink flows into the fibers and any solid pigment particles get trapped there when the ink dries. Even without any binder (as in classical Chinese/Japanese ink). That makes solid pigment suspension inks and paints (like lampblack ink, red minion or ocher ink, watercolor paints) the best
for paper.
On vellum, neither ink nor paint can get into the material to any significant amount. There, iron-gall is not just better than lampblack, it is necessary in order to get writing that does not rub or wash off at the first challenge. It works by binding chemically to the proteins in the vellum, and then becoming an insoluble 3D polymer of tannin and iron. Other color pigments need a good binder that can glue them to the vellum; but all common binders decay, or are not water-resistant.
(29-09-2025, 06:26 PM)Aga Tentakulus Wrote: You are not allowed to view links. Register or Login to view.The colour [red ink of the text of f67r2] was also used during the writer's lifetime.
But (a) just because the original scribe used red
ink, and the painter used red
paint, one cannot conclude that the latter was applied by the original scribe too. And (b) as we discussed in another thread, the red text of f67r2 was quite likely [self-censored].
All the best, --stolfi