f17r

[Jorge_Stolfi]

This seems consistent with iron-gall ink: You are not allowed to view links. Register or Login to view.

According to that graph, at 940 nm iron-gall ink should still have less than 40% reflectivity.  So yes, maybe the darker glyphs in that BL2014 clips are iron-gall ink.

But the color is still off, though.  I would expect it to be black...

Maybe whoever retraced those glyphs tried to match the old ink's color by mixing some ocher watercolor paint (brownish yellow-orange) and iron-gall ink (black) to get a similar shade of dark brown?

All the best, --stolfi