52 Fig. 2 Johannes Vermeer, Girl Reading a Letter at an Open Window, Scheme of the colour samples taken by Hermann Kühn in 1965 Fig. 3 Scheme of the colour samples taken by Christoph Herm and Annegret Fuhrmann 2017–2022 Table 1 Summary of the analysis results by Hermann Kühn, 1965 Sample/No. Description Results Dr 1 brown with ground from the lower edge of the painting reddish-brown, manganese-rich ochre with titanium-impurities, plant-black, small amounts of led-tin yellow and lead white Dr 1 a white – ground from sample 1 chalk, lead white (protein binding agent) Dr 2-S greenish white from the lower part of the curtain lead white (containing copper and silver), green earth pigments, a bit of lead-tin-yellow Dr 3 reddish white with ground from the upper window reveal lead white (containing copper and silver), reddish-brown, manganese-rich ochre (contains titanium) Dr 4 greenish-brown white with ground from the upper window reveal (upper edge) lead white (containing copper and silver), reddish-brown, manganese-rich ochre (containing titanium), small amounts of lead-antimonate yellow Dr 5-S white from the lower part of the window reveal lead white (containing copper and silver) Dr 6-S blue from the tablecloth natural ultramarine blue (heterogeneous particles), small amounts of lead white Dr 7-S red from the tablecloth cinnabar, small amounts of lead white Dr 8 yellow from the sleeve lead-tin yellow Dr9 green from the upper end of the curtain azurite, lead-tin yellow Q – cross section S – scraping sample M – material sample
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