Alicia M. Seldes, , Marta S. Maier, Gonzalo Abad, , Gabriela Siracusano, Blue Pigments in South American Painting (1610-1780), Journal of the American Institute for Conservation, Vol. 38, No. 2 (Summer, 1999), pp. 100-123
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Seldes et al. (1999) studied this question.