Wilton Diptych International Gothic style, and the nationality of the unknown artist is probably French or English. The Wilton Diptych is painted on two panels of Baltic oak, set in frames of the same material and joined by two hinges so that it may be closed to protect the inner painting. The inner faces of the panels are in excellent condition for their age, though some glazes have been lost, but the outer faces have paint losses from handling. The painting is in tempera, the ground paint being mixed with egg yolk and laid in thin glazes. The background and many details
Beaune Altarpiece different. The figures occupy distinctly separate niches and the colour schemes of the grisaille saints and donors contrast sharply. Like many mid-15th century polyptychs, the exterior panels borrow heavily from the "Ghent Altarpiece", which was completed in 1432. The combination of naturalistic donor portraits with grisaille imitation statues of saints is borrowed from that work, as is the treatment of the Annunciation. Van der Weyden used iconography in the Beaune exterior panels not found in his other works, which suggests Rolin may have commissioned the altarpiece to follow van Eyck's example. Van der Weyden was not inclined merely to imitate