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An X‐ray fluorescence method to determine whether sulfur is present in 19th century photographs due to intentional toning or to environmental deterioration is proposed. In the 19th century salted paper print photographic process, AgCl formed on the surface of a sheet of paper was exposed to sunlight in contact with a negative, leading to the printing out of a Ag image that was fixed by immersing it...
Five unprocessed historic platinum photographic papers were characterized by a combination of Raman, FTIR and XRF spectroscopies to gain insight into their manufacturing processes and obtain information that can help identify the use of similar papers in works of art in a non-invasive manner. The analysis of one of these papers, ‘Japine Platinotype for Sepia Tones,’ showed a sensitized surface layer...
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