Which documents prove provenance

The starting point: direct examination of the work

The primary source of information is the work itself, examined in person, out of its frame and with the reverse fully accessible in the case of a painting. The verso of a painting or the mount of a work on paper frequently carries labels of galleries and exhibitions, stamps of auction houses, carriers and customs, inventory numbers, autograph or pencil inscriptions. Each of these elements places the object at a specific moment in time and in a specific geographical setting, providing evidence to be verified: an exhibition label is compared with the relevant catalogue, a carrier's stamp with the years in which that firm was active. For this reason original labels must never be removed, and the replacement of a stretcher or a frame requires proper photographic documentation beforehand. At the same time, a refusal by the owner or the seller to allow examination of the reverse, of the original canvas or of the tacking margins is a cause for serious concern.

The documents held by the owner

The second level of enquiry lies in the file of the work, where one exists. The purchase invoice, the receipt, the contract or the notarial deed prove the most recent transfer of ownership, the only one that the current owner can attest at first hand. Insurance policies and inventories listing the items, asset valuations, estate inventories, wills, period photographs showing the work in an interior, correspondence with the artist, the gallery or the archive, together with earlier appraisals, condition reports and export and customs documents, all constitute evidence placing the work within a given estate at a certain date. For inherited objects, in the absence of the original title of purchase, it is precisely these records that prove historical ownership, with one distinction: they show that the work was in the family at that date, not how it came to be there. For living or recently deceased artists, the invoice or certificate of sale issued by the artist's gallery is normally the principal supporting document. What to keep, and how, is the subject of the article on the documents to keep for every work of art.

Published sources and the critical literature

The third level consists of publications. An auction catalogue with a lot number attests that the object was offered for sale on a given date, while the actual sale is confirmed by the auction records or by the final receipt. The name of the consignor, normally withheld by auction houses for reasons of confidentiality, is sometimes found annotated by hand in the catalogue copies kept in specialised libraries. An exhibition catalogue proves that the work was held by a lender at the time of the exhibition, although the provenance given in the entry comes from the lender and requires further confirmation. The artist's catalogue raisonné records the known provenance of the work: the analysis requires consulting every available edition, assessing the authority of the compilers and their scholarly independence from commercial interests, in the awareness that such repertories sometimes fail to record private transactions and sales at auction. Monographs and period journals complete the picture through reproductions and historical references that date the presence of the object in a particular collection.

Archives and documentary sources

The fourth level of enquiry concerns archival records, whose consultation requires methodical rigour sustained over time. Artists' archives and foundations, active mainly for art from the late nineteenth century onwards, hold registers, photographic records and correspondence relating to the production of the works and their first purchasers; for later transfers, these bodies have only the information reported to them, whose reliability must be assessed case by case. For earlier production, the main reference lies in the specialist studies that have reconstructed the artist's catalogue.

Where preserved and accessible, the archives of galleries and dealers record purchases and sales with dates and names, and in several cases have been deposited with public institutions. Auction houses keep their own catalogue archives and, in part, their sale records, while museum archives document acquisitions, loans, transport and exhibitions, alongside conservation files describing the physical condition of the work at a given date.

Family and notarial archives hold inventories and deeds of division among heirs in which works appear with descriptions that are at times summary and must be interpreted with due caution. To these resources are added the historical photographic archives, whose prints bear on the reverse annotations by scholars and dealers on the whereabouts of works, as well as the databases that index early inventories and sale catalogues, with coverage that varies by geographical area and historical period. Where feasible, the enquiry includes direct contact with previous owners.

Evidential weight and the verification of sources

Not all documents carry the same evidential weight, and none of them has any force before analytical verification. Stamps, labels, photographs and letters lend themselves to forgery just as the physical work does: paper supports, binders, inks and photographic prints answer to precise chronological parameters. Fictitious reconstructions often include the supporting documentation as well, starting with the first link in the chain of ownership, frequently attributed to an acquaintance or relative of the artist who can no longer be questioned.

An original, dated record, such as an invoice, a period image in which the object is clearly identifiable or an exhibition label matched in the catalogue, proves a matter of fact only once it has passed material and historical checks. Late statements, typed lists or oral family testimony are mere indications, useful for guiding research but unfit to close the sequence of ownership.

Each document must be read within the limits of what it attests: an invoice proves that a transaction took place between two parties on a certain date, not that the seller had good title; a catalogue confirms an offer or a loan, not ownership of the object. Documentation that is fragmentary, inconsistent or that changes in the course of negotiations calls for greater caution than the absence of documents.

The outcome of the provenance enquiry

The overall result takes the form of an analytical reconstruction of the provenance, in which every transfer is accompanied by its source and the interruptions are expressly declared. A transfer without documentary support is a working hypothesis and must be described as such. Unexplained gaps demand priority investigation not only because of the risk of spoliation or unlawful acts, but because they are a recurring feature of works that are not by the artist.

Reconstruction takes anywhere from weeks to months, at times years, and does not always lead to an unbroken sequence: a rigorous result that declares what could not be found is worth more than a list of names without supporting evidence. Consulting the registers of stolen and looted property, discussed in the article on what provenance is and how to read it, complements the analysis without replacing it, and the research must be entrusted to professionals whose analytical competence is independent of any commercial interest in the sale. Any issues concerning the validity of title fall within the province of specialist legal advice.