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2. In Artists' Pigments: a Handbook of Their History and Characteristics, vol. 3, (ed). National Gallery of Art: Washington, DC, 1997; Chapt. 4, 109.
3. In Artists' Pigments: a Handbook of Their History and Characteristics, vol. 1, (ed). National Gallery of Art: Washington, DC, 1986; Chapt. 6, 255.