Seite - 256 - in The Vienna Genesis - Material analysis and conservation of a Late Antique illuminated manuscript on purple parchment

256 Conservation of the Vienna Genesis and the new storage system the past to consolidate the ink and paint layers. It was not possible to identify and to date the different stains. As described in the chapter on parchment and on the miniatures, a hole on folio 2 was repaired with parchment before painting the miniatures. Many traces of former repairs or conservation measures can be seen, including pieces of parchment, strips of silk gauze, transparent paper, paper fibres and transparent pressure sensitive tapes, see chapter on the history. Pressure sensitive tapes, which look like Filmoplast (Neschen), are applied on the upper corners of every folio and on tears of the folios 3, page 6, 13, page 26, 14, page 28, and 16 on both pages. The ventilation holes in the acrylic sheets did not result in stains or visible surface changes, for instance by the accumulation of surface dirt. On every folio, silver ink has migrated to the other side of the parchment (Fig. 18). On the thin parchment, the migration strongly interferes with the legibility of the text. On cer- Fig. 13: (links) Matching, rust-like stains on folios a) 20, b) 21, and c) 22. Fig. 14: (oben) Glossy brownish stains on folio 12, page 23. Open-Access-Publikation im Sinne der CC-Lizenz BY 4.0