Tempera vs Oil Paint: What Actually Changed
Tempera binds pigment with egg yolk. Oil binds it with linseed or walnut oil. That single swap changes everything downstream: how fast it dries, whether you can blend, how dark the darks go, and how long you have to change your mind.
Tempera dries in minutes. Oil stays workable for days. Almost every visible difference between a fifteenth century panel and a seventeenth century canvas comes from that one fact.
The archive, where it gets specific
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What each one is made of
Tempera. Ground pigment mixed with egg yolk and a little water. Painted on a wooden panel prepared with layers of gesso, sanded smooth.
Oil. Ground pigment mixed with a drying oil, usually linseed. Painted on panel or, from the sixteenth century, on stretched canvas.
The difference you can see across a room
Tempera cannot blend. It sets too fast, so tone is built with thousands of small parallel strokes laid side by side. Get close to an early Italian panel and you can count them.
The surface is matte and slightly chalky, the colours clean and bright, and the darks never go very deep. There is a limit to how black egg tempera will get.
Oil does the opposite. It stays wet, so one tone can be pushed into another until the join disappears. It dries glossy, holds far darker darks, and can be built in transparent layers that light passes through and bounces back out of.
What oil made possible that tempera never could
Two things, and both of them changed painting.
The first is soft edges. Sfumato needs a paint that stays open long enough to be feathered away into nothing. In tempera it is not possible.
The second is deep shadow. The black grounds of tenebrism need a binder that can carry real darkness. Egg cannot.
Add the ability to scrape back, repaint and correct over weeks, and you have the whole seventeenth century.
When the switch happened
Oil spread out of the Netherlands in the fifteenth century and reached Italy soon after. Antonello da Messina is usually credited with carrying the northern method to Venice around the 1470s.
The changeover was slow and messy. Painters mixed the two, laying oil glazes over a tempera underpainting for years before committing.
The myth about who invented oil painting
There is a famous case of a painter getting the choice wrong. Leonardo wanted the blending that only slow paint allows, so he refused true fresco for the Last Supper and worked on a dry wall instead.
It began flaking within his lifetime. The full story is here.
Vasari credited Jan van Eyck with inventing it. He did not. Oil as a paint binder is far older, documented in Asia centuries earlier.
What van Eyck and his contemporaries did was work out how to control it: which oils, which driers, how thin to lay a glaze so the layer underneath still shines through. That is refinement, not invention, and it was enough to change European painting.
Two paintings that make the point
Botticelli's Birth of Venus is tempera, and I would send anyone there first: the pale flesh, the crisp contours, every strand of hair a drawn line. Nothing melts. Botticelli never had the option.
Botticelli's Birth of Venus is tempera. Look at the pale flesh, the crisp contours, the way every strand of hair is a drawn line. Nothing melts.
Any Rembrandt is oil. Look at a sleeve where the paint is a quarter of an inch thick, or a shadow with no bottom to it. Neither is available in egg.
Does anyone still use tempera
Yes. Andrew Wyeth built his entire career on it in the twentieth century, precisely because it forces the slow, dry, hatched surface that oil makes too easy to avoid.
Questions people ask about tempera and oil
Which one lasts longer? Tempera, if the panel stays stable. Fifteenth century tempera panels often look fresher than seventeenth century oils, which yellow and crack.
Can you tell them apart by eye? Usually. Matte, hatched and bright means tempera. Glossy, blended and deep means oil.
Is tempera the same as gouache? No. Gouache is bound with gum arabic and is water soluble once dry. Tempera sets permanently.
Why did painters bother switching? Time. Oil let them correct, blend and glaze for weeks instead of committing in minutes.
What about fresco? Different problem entirely. Fresco is pigment in wet plaster, bound by the wall itself as it cures.
The thing that decided it
Tempera asks a painter to know the picture before starting. Oil lets a painter find it while working. Everything else follows from that. The full explanations are here for tempera and for oil painting.