What the Back of a Canvas Can Tell a Conservator

The painted face draws attention, but the reverse can explain how a canvas has survived. The fabric may be secured with tacks or staples to a stretcher or strainer. Corners, crossbars, keys and the tension of the canvas all matter when a conservator assesses stability. The Canadian Conservation Institute's painting-examination checklist asks an examiner to record the fabric, attachment, tacking margins and auxiliary support, including signs of deformation or earlier stretching.

An old set of holes can be significant, but it is not a self-explanatory date stamp. A canvas might have been removed from one support, stretched again, lined, or otherwise treated. A reverse view can raise a question about that history; a condition report, treatment record or closer examination is needed to answer it.

A paper label on a frame, a stamp on a stretcher or a handwritten number may point toward a shipment, exhibition, inventory or previous owner. CCI notes that inscriptions and labels on supports can be relevant to provenance and recommends retaining information on original frames. The Getty's discussion of modern and contemporary canvas treatment includes stretchers, inscriptions, old tacking holes, handling marks and labels among the often unseen elements that contribute to an artwork's history.

The distinction is between a clue and a conclusion. A label may have been attached later; a frame may have changed; a number may belong to a dealer's inventory rather than to the artist. Compare its wording and materials with independent records and document where it sits. Do not turn an isolated mark into proof of authorship or ownership.