1. R. White, Nat Gallery Tech Bull 10, 58–71 (1986)
2. L. Carlyle, A. Southall, Robert Vernon’s Gift, British Art for the Nation 1847 (Tate Gallery Publications, Millbank, 1993), pp.21–26
3. G.M. Languri, Molecular Studies of Asphalt, Mummy and Kassel Earth Pigments, Their Characterisation, Identification and Effect on the Drying of Traditional Oil Paint, University of Amsterdam, 2004. https://hdl.handle.net/11245/1.238013
4. N. Costaras, A Changing Art Nineteenth-Century Painting Practice and Conservation (Archetype Publications Ltd., London, 2017), pp.14–22
5. R. Frame, Materia: Journal of Technical Art History 2 (2022). https://issue-2.materiajournal.com/frame/