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XRF (Elio: 40kV, 80 µA, spot measurements of 120s each) and reflectography (DinoLite: x50 magnification, vis, NIR and UV light) analysis of inks and pigments (for Cpt823) from Coptic manuscritps Mss. Cpt. 813 (6th century CE, Apa Jeremiah), 814 (7th century CE, Apa Jeremiah) and 815 (8th century CE, Apa Jeremiah). This is a complementary, more detailed analysis of these 3 codices for which 1-2 pages had been already investigated in 2019.
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