27-04-2026, 02:44 PM
(27-04-2026, 02:02 PM)Jorge_Stolfi wrote: You are not allowed to view links. Register or Login to view.So you admit that there is no evidence in the McCrone report that justifies the claim that the VMS ink is IGI?
I admit that I have absolutely no idea how to interpret evidence presented in McCrone report. I have absolutely no idea how to determine if some writing is in iron gall ink or not. I have very primitive understanding of spectroscopy (or spectrography, I don't even know which it is). So, for me the only safe way is to rely on their conclusions, unless someone else with relevant experience runs some tests and challenges these conclusions.
I also do not really take second-hand analysis for granted when it comes to material objects, so pulling the numbers from McCrone report and reinterpreting them or analysis of the ink based on MSI images will never be conclusive to me by themselves, unless we know for sure what exactly was done. Who knows what combination of lighting, filters and processing was employed in producing these "940nm" images and how it could affect the contrast of the ink.
It is possible to say that the folio numbers ink behaves differently in IR compared to the text ink and does remain very visible in 940nm images, while the marginalia ink behaves the same as the text ink. Also for the retraced daiin on You are not allowed to view links. Register or Login to view. the retraced part remains quite visible in 940nm, so maybe this is a later retracing. Or maybe two layers of ink produce just enough contrast to become visible in 940nm.