Abstract
Lead-containing pigments, which have been widely used in paintings and polychrome sculptures since antiquity, show a specific instability. The pigments alteration often leads to a darkening of the pictorial layer, which is harmful to the aesthetic and understanding of the artworks. No specific restoration technique is available to recover the original color of the discolored paint areas. The thermal properties of lead compounds, however, allow to conceive a method based on continuous-wave laser irradiation of the blackened layer. A set of experimental tests was achieved to optimize the process, and validate the technique in a real situation of a restoration workshop.
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