Craquelure: What the Cracks in an Old Painting Actually Tell You

♦ ♦ ♦ JULY 05, 2026 | 4 MIN READ Craquelure: What the Cracks in an Old Painting Actually Tell You At a Glance Craquelure is the web of cracks in an aged painting, and most collectors read it backwards. The cracks are usually a sign the picture was built soundly and grew old honestly, not that it is damaged. Stand close to a genuinely old painting and the image dissolves into a net. A fine web of cracks runs across the whole surface, catching the light in thin bright lines, so that a face is now a face laid over a map of tiny islands. That web has a name. Craquelure, from the French, is the network of cracks that opens in a paint or varnish film as it ages. The Tate’s own glossary defines it plainly as “the fine pattern of dense cracking formed on the surface of paintings.” Collectors see it and reach for the phone to ask about condition. A painter sees it and reads how the thing was made. What craquelure is, and why it usually is not damage A painting is a stack of layers that move at different rates. The support underneath, canvas or a wood panel, breathes with every shift in temperature and humidity, swelling a little in damp, shrinking in dry. The layers on top, the ground and the paint and the varnish, grow more brittle every decade. Sooner or later the stiff film can no longer follow the support that carries it, and it relieves the tension the only way it can, by cracking into a network. That is age craquelure, and here is the p art collectors get backwards: it is not a wound. It is the sound of a well-built film aging in step with its support. It forms slowly, over many decades, it runs through the whole picture rather than pooling in one spot, and it goes all the way down to the ground. A conservator does not try to erase it. Erasing it would mean erasing the evidence that the painting is actually old. Age craquelure is not something that happened to the painting. It is the painting keeping time. The pattern even records what the picture is painted on. A canvas tends to crack in a garland or web that answers the weave and the pull of the stretcher; a wood panel tends to crack in long lines that run with the grain. A painter can often glance at the net and tell you canvas from panel before reading a single label. Age cracks versus drying cracks: how a painter tells them apart Not every crack is the honest kind, and this is where the bench knowledge earns its keep. There is a second, entirely different crack, and it is a making fault, not an aging one. Drying cracks, sometimes called traction cracks, come from breaking the oldest rule in oil painting: fat over lean . If a fast-drying lean layer is laid over a slower, oilier layer still on the move underneath, the top skin shrinks and splits while the paint below is soft, and the crack pulls wide open with rounded lip edges, often showing the colour of the layer beneath. Too much medium, or old tricks like bitumen, do the same thing. These show up early, in years rather than centuries, they s