Fig. 17From: Colour identification, degradation processes and findings in a fifteenth-century Book of Hours: the case study of Cofre n.º 31 from Mafra National PalaceExamples of mechanical degradation: a detachment of a lead white based pigment in Virgin’s face, f.25r; b detachment of azurite in a line filler, and abrasion in writing, f.48v; c abrasion in a gilded halo, f.91r; d dissolution of black pigment in a border, f.91rBack to article page