Figure 1
(a) Central plafond (Epiphany) from the altarpiece of the Conestable. Asterisks indicate some of the points from which samples were extracted (photography from `Serveis de Restauració i Bens Mobles de la Generalitat de Catalunya'). (b) Detail of one of the points from which a sample was extracted. (c) Optical microscopy image of the sample, detail of fragment and section. (1: alteration layer; 2, 3 and 4: green chromatic layers; 5: preparation layer). |