(25-03-2026, 09:22 AM)Fabrizio Salani wrote: You are not allowed to view links. Register or Login to view.Hello, I have published some reports of the Raman and X-ray spectroscopy investigations carried out in the laboratories of the Italian state university UNI.MO.RE. I have not published the names of the professors who performed them, only for privacy reasons and I don't know if I have authorization, but they are the same ones who analyzed the "Borso D'Este Bible".
Once again, I really appreciate your helpful answers fabrizio!
I hope you will find it okay that I repost your images with the english translations in this post, so I can refer to it easily in the future . This forum is frustrating with displaying images sometimes. I translated everything with google translate, please tell me if any text is in the wrong place or if theres a mistranslation!
Raman Microscopy Analysis of leaf colors
Green obtained with lazurite (ultramarine) and an iron-based yellow (goethite hematite)
Raman spectrum of green indicating the ultramarine nature of the blue mixed with yellow. In the blue-green area there are also grains of calcite (band at 1085 cm-1) and coal (wide bands at approximately 1350 and 1580 cm-1)
Another point of the green leaves shows the Raman specrum reported below:
The Raman spectrum of the leaf green resembles that of lazurite (ultramarine), but the peaks at 184, 260 and 717cm-1 are not attributable to it, but to a green based on other metals.
Raman spectrum recorded on a yellow grain: hematite (red ochre) and traces of lazurite (551 cm-1)
Raman spectrum at the red end superimposed on alizarin lazurite
Raman specrum of two points of the ink present in the upper part of the sheet
The ink is neither carbon-based nor iron gall based: it could be an ink of the type prepared with Logwood, as mentioned by Bicchieri (1).
Raman spectra of glasses (1) on ink made with logwood with carbon and/or metals, particularly iron, as XRF analysis on the letters seems to indicate.
Parchment
Base: Calcium, Potassium, Iron
Ink: Calcium, Potassium, Iron
Green 1: Calcium, Potassium, Titanium, Iron, Cobalt, Zinc, Nickel
Green 2: Calcium, Titanium, Iron, Cobalt, Zinc, Nickel (peaks to the right of zinc resulting from Lead in the support glass)
Pink: Calcium, Potassium, Iron, Zinc (Lead as above)
Black: Calcium, Potassium, Iron, Zinc (Lead as above)
Black thread on the back: Calcium, Potassium, Iron
"Raman spectra were acquired directly by focusing a point on the artwork using a Jobin Yvon-Horiba Labram Raman microscope, equipped with a 632.8 nm red laser, operating at a maximum power of 5 mW, edge filters to eliminate excitation, and a 256 x 1024 pixel CCD detector cooled by the Peltier effect to -70°C.
The spectra were recorded by averaging the signal over several seconds and then processed using the Grams AI program: linearization, background subtraction, and other mathematical operations were necessary for direct comparison of the experimental spectra with the reference spectra in the database. The instrument was equipped with long-distance fluorite objectives at 50x and 100x magnification, capable of focusing on the portion to be analyzed without approaching it too closely, thus avoiding the risk of inadvertent abrasion."
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