(05-03-2016, 12:16 PM)Sam G Wrote: You are not allowed to view links. Register or Login to view.There's a large beige stain running vertically on f93r. We might be able to infer something about when colors were added to the manuscript, in particular whether it was before or after they were placed in their present order, from examining it. ...
2) It looks like the stain started at the bottom and flowed "upward", eventually running off the top of the page. As it did so, it looks like it picked up some green pigment from the leaves of the plant and transferred it along into the upper part of the stain. From this, as well as looking at how the stain overlaps the green leaves, it seems clear that the green must have already been present when the stain was formed.
I agree with this analysis.
For this and other reasons, I believe that the "paints" used by the Painter were quite runny, more like inks. Most of the "painting" appears to have been done with a broad-tipped quill rather than with a brush. One can see his individual paint strokes (~1 mm wide) on the root (Q), and also on the leaves, near the binding gutter (P). On other places, especially when he wanted a mottled texture, he used a very crude brush, like a twig with a chewed tip or similar.
As I see it, the Painter accidentally overturned the bottle of yellow ink when he was painting the flower. That was after the text and the plant outline had been drawn, in the usual brown ink, and after the leaves had been painted green.
The "after" there may have been anywhere between minutes and centuries. Since this point does not make much difference for this post, I will not delve into it.
As Sam G proposes, the ink flowed from the spill point (A) towards the north (logical top) edge of the page (B) in an almost straight line. That seems to indicate that, at the time, the folio was significantly tilted, with the south (logical bottom) edge higher than the north edge. That would be strange if he was writing text, but since he was painting the flower, it seems even natural that he would turn the page upside down, to bring the flower closer. The tilt then would be that of his writing-desk.
And that may also explain why there is no sign of that yellow "paint" on the following pages: because of the tilt, the paint that flowed past the north edge (B) dripped onto the desk, away from the book.
And the tilt also makes the tipping of the bottle less surprising...
As soon as that happened, the Painter righted the bottle and scrambled to get a cloth or blotting paper. Meanwhile the spilled ink continued to flow downwards, towards the north edge. As it did so, it softened and lifted some of the green paint and some of the ink from the text and the plant outline. Before it could be mopped up, it carried these bits of ink and green away over a distance of ~3 cm (X).
Some of the ink became deposited along the edges of that part of the spill, creating dark brown lines along the stain's perimeter
The Painter then mopped up the spilled paint. If the spill had happened on blank vellum, he could have washed it away with a damp cloth. But here he could not do that, because it would have washed away the text too. But he may have done so, imperfectly, in the north margin, above the text; that would explain the "water" stain in that area (J,K).
Sometime later someone restored the words that had been somewhat erased by the paint. Again, the "later" may have been minutes or centuries, we can't tell. This last person could have been the Painter himself or someone else. (But I don't think that the Painter would have been able to do that, given how crude his work generally is.)
Makes sense?
Quote: But was the green still wet when the stain was formed, or could the pigment transfer have occurred when the green was already dry?
If the green paint was water-based, like gouache (tempera) or watercolor, it would not be water-resistant, and would have been softened by the liquid yellow ink.
It is possible that the green paint, specifically, was not water-based, but an organic copper salt (what McCrone called "resinate"), like "copper soap", dissolved in some organic solvent like turpentine or linseed oil. That might explain why the green-colored areas, specifically, are so visible from the other side of the vellum. It might also explain the way the green paint got deposited along the edges of the stain. In that case, the green paint would have to be still fresh. But it is unclear whether the stain would have acquired the greenish hue between lines 7 and 17.
All the best, --stolfi