Jo Kirby Atkinson, independent researcher. BSc in Chemistry and Zoology, University of Exeter, 1966; ALA (Associate of the Library Association), School of Librarianship, Ealing Technical College, 1968; BA Hons History of Art, Birkbeck, University of London (Courtauld Institute External Degree), 1987. Employment: Deputy Branch Librarian, London Borough of Hounslow Library Services, 1966–70; Scientific Department, The National Gallery, London, 1970–1977, 1982–7 (freelance), 1987–2009; retired, then contracted to work on the CHARISMA European project 2009–2014. Research interests: the technology of red and yellow lake pigments made from natural organic dyes; colour; colour change caused by light and other factors; the study of historical literature relating to artists’ materials and methods of painting; the trade in artists’ materials; the costs and relative value of pigments and other materials. D.Litt. Honoris causa Courtauld Institute, University of London, 2016; Fellow of the Society of Antiquaries of London (FSA), 2018; Fellow of the International Institute for Conservation of Historic and Artistic Works (FIIC), 1993; Secretary-General of the International Institute for Conservation of Historic and Artistic Works, 2010–2019. ORCID 0009-0006-5527-8845

David Saunders, Honorary Researcher, National Gallery London; Honorary Research Fellow, British Museum. BSc Chemistry, York University 1981; DPhil Chemistry, York University 1984. Employment: Postdoctoral Fellow, Chemistry Department, Bristol University 1984–5; Principal Scientist, Scientific Department, National Gallery, London 1985–2005; Keeper, Department of Conservation and Scientific Research, British Museum 2005–15. Guest Scholar, Getty Conservation Institute, Los Angeles 2015–6 and 2024. Getty Rothschild Fellow, Getty Research Institute, Los Angeles 2017. Visiting Professor, Institute for Sustainable Heritage, University College London 2016–21. Visiting Professor, Conservation Center, Institute of Fine Arts, New York University 2018 and 2021. Research interests: Effect of environment on deterioration of museum collections, particularly light-induced deterioration and its prevention. Development of sustainable preventive conservation practice and policy, especially museum lighting. Development of high-resolution digital imaging systems assisting in examination and analysis of museum objects, particularly paintings, works of art on paper. Fellow, the International Institute for Conservation (FIIC) 1993; Davies Medallist, Royal Photographic Society 2005; Fellow, the Society of Antiquaries of London (FSA) 2013; Vice-President, the International Institute for Conservation 2013–18; Syndic (Trustee) of the Fitzwilliam Museum, Cambridge 2015–25.ORCID 0000-0002-8369-6554