What Is Craquelure?
Craquelure is the fine network of cracks that forms across the surface of an old painting as its paint and varnish age, dry out and grow brittle. Far from a flaw, it is the natural fingerprint of time on a picture.
Look closely at almost any old master and you will see it: a web of tiny lines across the whole surface.
It is also one of the quiet tools experts use to tell a real old painting from a fake.
Craquelure in brief
What it is: the web of fine cracks in aged paint and varnish.
The cause: layers drying, shrinking and stiffening over time.
The pattern: it differs by medium, support and climate.
The use: it helps experts date and authenticate works.
The catch: forgers try, and usually fail, to fake it.
The ones I would hand you next
Three that take a single painting apart, properly:
Inside Monet house at Giverny, room by room, including his own bedroom
The Ambassadors, detail by detail, the object at the bottom that only works from one side
Luncheon of the Boating Party, detail by detail, who everybody at that table actually was
Why old paint cracks
A painting is built of layers: ground, paint, varnish. Each ages at its own speed, shrinking and hardening, and as they pull against each other the surface splits into a network of cracks.
Heat, damp and movement speed it up. This is why the surface of an old oil painting looks different from a panel in tempera, which cracks in its own particular way.
A fingerprint that betrays a fake
The pattern of craquelure is hard to copy. Italian panels, Flemish oak and stretched canvas each crack in a recognisable manner, and the lines should run through the paint, not just sit on top.
Forgers have baked and rolled their pictures to force cracks, but the result rarely matches the real thing. The famous forger who fooled the experts, Han van Meegeren, is the subject of one of our stories on how a fake fooled the art world.
Common questions about craquelure
What is craquelure? The network of fine cracks in an aged painting.
Is craquelure damage? Usually no. It is the normal result of paint and varnish aging.
What causes it? Layers drying and shrinking at different rates over time.
Can it be faked? Forgers try, but the natural pattern is very hard to copy.
Does it help spot fakes? Yes, experts study the crack pattern to judge age and authenticity.
The signature only time can write
Craquelure is the one mark on a painting the artist never made and never wanted, yet it tells you the picture has truly lived. It is the slow handwriting of centuries, and it is almost impossible to forge.