Crucifix, , ( detail ) tempera on panel by Giotto di Bondone Location : Church Santa Maria Novella, Florence Tempura is made partially from egg whites and accounts for the paint flaking off in many masterpieces.
Jan van Eyck, Crucifixion, c. Left panel of Crucifixion and Last Judgment diptych. Oil on canvas, transferred from wood. The Metropolitan Museum of Art, New York. "Among the earliest surviving works by Jan van Eyck"