Journal · Connoisseurship · November 2026

The back of a painting is the honest side

Almost everyone photographs the front. The front is the part that was made to be looked at, and it is also the part that is easiest to imitate. The back is where a painting accumulates the evidence nobody was composing for an audience: labels, stamps, stencils, inscriptions, repairs. Learn to read it and you can often date a work, place it in a collection, or spot a problem before a specialist ever sees it.

What is actually back there

Four kinds of thing, and they are worth separating because they carry very different weight.

• Labels. Gallery, auction house, exhibition, framer, shipper, customs. A gallery label with a stock number is the single most useful object on a painting’s reverse, because stock numbers can be matched against surviving dealer records.
• Stamps and stencils. Canvas-maker and colourman marks on the fabric or stretcher; shipping stencils; collection marks. A colourman’s stamp dates the support, which sets an earliest possible date for the painting.
• Inscriptions. A title, a sitter’s name, a date, an artist’s own note, or a later owner’s. Handwriting can be compared; ink and medium can be dated.
• Physical history. Relining, patches, keyed-out corners, tacking margins, nail holes that do not line up with the present stretcher. All of it says what has been done to the object.

A dealer’s stock number can be matched against surviving records. A signature cannot be matched against anything.

Why it is harder to fake than the front

A forged painting has to persuade the eye. A forged reverse has to persuade the archive. If a canvas carries a colourman’s stamp, that firm’s addresses and marks changed over time and are documented; if it carries an exhibition label, that exhibition had a catalogue with numbered entries. Each mark is a claim that can be checked against something written down by someone else, years ago, for an unrelated reason. That is what makes it evidence rather than assertion.

It is not infallible. Labels are moved between paintings, deliberately or by a careless framer. A stretcher can be newer than the canvas, and a canvas newer than the image painted on it. But a reverse that does not hold together — a label from a gallery that closed before the canvas was manufactured, a stencil in a typeface that did not exist — gives itself away in a way a convincing front does not.

How to photograph it

If you do one thing after reading this, do this. Before a work goes to a framer, a restorer, a shipper or a sale, photograph the reverse properly, and keep the files.

• The whole reverse, square on, filling the frame, in even daylight
• Every label and stamp individually, close enough to read the smallest print
• All four corners of the stretcher and both sides of each crossbar
• The tacking edges where the canvas turns the stretcher
• The frame’s own reverse, separately, if the work comes out of it
• A ruler or coin in one shot, for scale

Do it before anything is cleaned, re-framed or re-lined. Restoration routinely destroys the reverse: a lining attaches a new canvas over the old one and the original back disappears, labels and all. Plenty of paintings have lost their provenance to a well-meant conservation bill.

What it does for the value

Two paintings of equal quality by the same hand will not fetch the same price if one has a documented chain of ownership and the other has none. The reverse is where that chain usually begins. A single legible gallery label can turn “attributed to” into an entry in a catalogue raisonné, and an unsaleable picture into a saleable one.

It also works the other way. A gap in ownership between 1933 and 1945 on a European work is the first thing an auction house specialist looks for, and the back of the painting is often the only place to start looking. Finding the answer early — even if the answer is “this part is unknown” — is worth far more than discovering it at the moment of sale.