In Christ Washing the Disciples' Feet (Tintoretto), how is the Painting materials of the National Gallery elucidated?
The painting underwent a thorough cleaning and restoration in the National Gallery shortly before 1979. The scientists of the Gallery also investigated the technical aspects of the painting and the painting materials used by Tintoretto.  Main pigments in this painting are ultramarine, red lakes (kermes, madder and lac), malachite and azurite. Tintoretto also used the rare arsenic sulfide pigments realgar and orpiment. An illustrated pigment analysis can be found at ColourLex.It remained at San Trovaso until purchased by a British collector sometime around 1797. It eventually came into the possession of the Dukes of Hamilton where it was displayed at Hamilton Palace. In 1882 they sold a large portion of their collection, and the Tintoretto was purchased by the National Gallery.
azurite San Trovaso National Gallery Dukes of Hamilton Tintoretto malachite realgar ultramarine Hamilton Palace kermes madder lac orpiment