Before revision: (2010, July)., The National Archives (United Kingdom), Qatar National Library (Qatar), French National Centre for Scientific Research in Paris, Philadelphia Museum of Art and other institutions.Instytut Fotonowy Micro Fading Tester.
After revision: in the USA, Gothenburg University in Sweden, National Museum of Art, Architecture and Design in Norway, Kunstmuseum Basel in Switzerland, United States Holocaust Memorial Museum, National Library of Norway, National Taiwan Museum of Fine Arts, State Academy of Fine Arts Stuttgart in Germany,(2010, July)., The National Archives (United Kingdom), Qatar National Library (Qatar), French National Centre for Scientific Research in Paris, Philadelphia Museum of Art and other institutions.Instytut Fotonowy Micro Fading Tester.