Grisaille (/ɡrᵻˈzaɪ/ or /ɡrᵻˈzeɪl/; French: gris[ɡʁizaj] 'grey') is a term for a painting executed entirely in shades of grey or of another neutral greyish colour. It is particularly used in large decorative schemes in imitation of sculpture. Many grisailles in fact include a slightly wider colour range, like the Andrea del Sarto fresco illustrated. Paintings executed in brown are referred to as brunaille, and paintings executed in green are called verdaille.
A grisaille may be executed for its own sake, as underpainting for an oil painting (in preparation for glazing layers of colour over it), or as a model for an engraver to work from. "Rubens and his school sometimes use monochrome techniques in sketching compositions for engravers." Full colouring of a subject makes many more demands of an artist, and working in grisaille was often chosen as being quicker and cheaper, although the effect was sometimes deliberately chosen for aesthetic reasons. Grisaille paintings resemble the drawings, normally in monochrome, that artists from the Renaissance on were trained to produce; like drawings they can also betray the hand of a less talented assistant more easily than a fully coloured painting.
Giotto used grisaille in the lower registers of his frescoes in the Scrovegni Chapel, and Robert Campin, Jan van Eyck and their successors painted grisaille figures on the outsides of the wings of triptychs, including the Ghent Altarpiece. Originally these were the sides on display for most of the time, as the doors were normally kept closed except on feast days or at the (paid) request of tourists. However today these images are often invisible in museums when the tryptych is displayed open and flat against a wall. In these cases imitation of sculpture was intended; sculpture was still more expensive than a painting even by a top master.
With the 20th century's emphasis on direct (alla prima) painting, the grisaille technique lost favour with artists of the period. This historic method is still incorporated into the curriculum of some private ateliers.
The term is also applied to monochrome painting in other media such as enamels, where an effect similar to a relief in silver may be intended. It is common in stained glass, where the need for sections in different colours was thereby greatly reduced. Portions of a window may be done in grisaille — using, for example, silver stain or vitreous paint — while other sections are done in coloured glass.