7Elisabeth West FitzHugh and Lynda A. Zycherman, 1983, An early man-made blue pigments from China barium copper silicate, Studies in Conservalion, 28, 15- 23.
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10Berke, H, 2002, Chemistry in ancient times: The development of blue and purple pigments, Angew. Chem. Int. Ed. 41 (14), 2483- 2487.
