Colnaghi to manage "Madrid Caravaggio" restoration, authentication, and sale Renowned gallery will lead scholarly assessment, scientific analysis, restoration, and subsequent sale. Photo: Ansorena. MADRID .-Colnaghi gallery has been selected to spearhead the scholarly assessment, scientific analysis, and restoration of an Ecce Homo painting now understood to be by the great Baroque master Michelangelo Merisi da Caravaggio. The oil on canvas depicting Christ being crowned with thorns was originally attributed to the circle of the 17th-century Spanish painter José de Ribera. The painting, ...