A-level: Making Green—Tempera versus Oil by The National Gallery, London Video from The National Gallery (London) Cite this page Cite this page as: The National Gallery, London, "A-level: Making Green—Tempera versus Oil," in Smarthistory, June 14, 2017, accessed March 29, 2024, https://smarthistory.org/making-green-tempera-versus-oil-2/.