Page - 158 - in The Vienna Genesis - Material analysis and conservation of a Late Antique illuminated manuscript on purple parchment

158 Alteration study of silver inks on parchment ST3 MC CCXLVIII Silver ink with additional components Sodium hydrogen carbonate (NaHCO3, soda) ST4 MC CCXLVIII Silver ink with additional components Potassium nitrate (KNO3, saltpetre) ST5 H III, XLIII Pure silver ink - ST6 CL M 24–29 Silver ink with additional components Sodium hydrogen carbonate (NaHCO3, soda) ST7 LP X 8a /3–4 Pure silver ink - ST8 CL α 11–20 Pure silver ink - ST9 H I, VII Pure silver ink - ST10 CL δ 29–34 Silver ink with additional components Copper(II)acetate (CuAc2, Verdigris) ST11 MC L a (1. paragraph) Silver ink with additional components Copper(II)acetate (CuAc2, Verdigris) ST12 MC L a (1. paragraph) Silver ink with additional components Copper(II)acetate (CuAc2, Verdigris) ST13 MC CCXLVIII Pure silver ink - ST14 MC CCXLVIII Silver ink with additional components Potassium nitrate (KNO3, saltpetre) Preparation of silver inks The production of all reference inks and the further preparation of the reference samples followed four major steps5 (Fig. 1): 1. production of powdery silver 2. addition of further components 3. addition of a liquid binder 4. application of the inks on the parchment samples and burnishing of the dried ink with an agate polishing stone 5 The experiments were carried out by Sophie Rabitsch and Antonia Malissa in the Institute of Conservation of the Austrian National Library and the Conservation Science Department of the Kunsthistorisches Museum Vienna from November 2016 until January 2017 (sub study 1) and in April 2017 (sub study 2). Open-Access-Publikation im Sinne der CC-Lizenz BY 4.0