Os estratos preparatórios nas obras do pintor eborense Francisco João (act. 1563-1595)

Helena Pinheiro de Melo, António João Cruz, António Candeias, José Mirão, Ana Margarida Cardoso, Sara Valadas, "Os estratos preparatórios nas obras do pintor eborense Francisco João (act. 1563-1595)", in Vítor Serrão, Vanessa Antunes, Ana Isabel Seruya (ed.), As Preparações na Pintura Portuguesa. Séculos XV e XVI, Lisboa, Faculdade de Letras da Universidade de Lisboa, 2013, ISBN 978-989-96236-2-0, pp. 143-153

 

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Abstract This article presents the material and technological data obtained from the study of the preparatory layers of 32 panel paintings produced in the Alentejo region, southern Portugal, and attributed to the painter Francisco João, active between 1563 and 1595. The investigation was based on the macroscopic observation of the paintings and on the analysis of the preparatory layers with several analytical methods. The grounds are white and composed of a single layer of "gesso grosso", mainly anhydrite mixed with a little calcium sulphate dihydrate, calcite and dolomite. The priming layers, found in six groups of paintings, are medium-rich and carry a few red (minium or vermilion) or ochre and brown (possibly umber) pigments. Non painted edges and barbs were found in the majority of paintings as well as the imprints of the tools used to spread and polish the preparatory layers.
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