Oil Painting

Oil painting is a technique in which dry pigments are suspended in a drying oil — typically linseed, walnut, or poppy oil — to create a paint that remains workable for extended periods, dries slowly through oxidation, and can be built up in thin, translucent layers (glazes) to create a luminous depth and colour saturation impossible to achieve with any other medium. The technique was practised in various forms in antiquity and the medieval period, but was perfected and systematised in the early fifteenth century by Jan van Eyck in the Burgundian Netherlands, and became the dominant painting medium of the Western tradition from the late fifteenth century onward.

Van Eyck's achievement was not the invention of oil paint but the development of a specific layering and glazing technique that exploited the medium's unique optical properties: the ability of thin translucent layers of oil-bound pigment to transmit and reflect light from below, creating a depth and luminosity that the opaque, quick-drying surfaces of tempera could not approach. The Ghent Altarpiece (1432) is the founding document of this achievement.

Oil painting in the Northern Renaissance technique works through the sequential application of multiple layers of paint, from the most opaque underlayers to the most translucent upper glazes. The process typically begins with a ground — a white or tinted preparation of the support — followed by an underdrawing in black chalk or ink, followed by an underpainting in grey or brown tones (grisaille) that establishes the tonal structure of the composition, followed by successive layers of colour glaze that build up the final chromatic effect.

The optical quality of oil painting derives from this layered structure: light penetrates through the transparent upper glazes, reflects from the lighter underlayers, and passes back through the glazes on its way to the viewer's eye. The result is a colour that appears to glow from within — a quality that no surface application of opaque paint can simulate.

Oil painting as a systematic technique was developed by Jan van Eyck in the Burgundian Netherlands in the early fifteenth century, demonstrated in the Ghent Altarpiece (completed 1432) and the Arnolfini Portrait (1434). The technique was adopted by subsequent generations of Flemish painters — Rogier van der Weyden, Hans Memling, Hugo van der Goes — and crossed the Alps to Italy in the second half of the fifteenth century, arriving in Venice around 1475 through the agency of Antonello da Messina, who had learned it in Naples. Titian and the Venetian school made it the medium of their most ambitious works.

Oil painting became the dominant medium of Western painting from the late fifteenth century onward and remained so until the twentieth century. Every painter in the Western tradition from Raphael to Rembrandt, from Velázquez to Vermeer, from Turner to Cézanne, worked primarily in oil. The technique's capacity for revision, blending, and glazing made it the most flexible and expressive medium available to painters — more fluid than fresco, more revisable than tempera, more translucent than gouache. Its dominance in Western art is inseparable from the quality that distinguishes Western painting from every other tradition: the ability to represent light.