Authentication is the process of establishing that a work was made by the artist it is attributed to, and the field rests on three pillars: the expert eye (connoisseurship), the laboratory (forensic science), and the paper trail (provenance and archives). A serious authentication on a high-value painting is a multi-month project that pulls in several specialists, and a full scientific workup at a top private lab starts at around $13,500 per work. We treat this as the first line of risk management on any acquisition, because the gap between a real painting and a convincing fake is the gap between an asset and a worthless object.

Here is why it matters for an investor. The art market runs on attribution, and attribution is a judgment that can be challenged, revised, or destroyed. A work that loses its attribution does not lose 20% of its value. It loses almost all of it. So before our team gets to whether an artist market is appreciating, we have to be confident the thing is what the consignor says it is. This article walks through how that confidence gets built, what each step costs, and what changed when the people who once issued the final word stopped doing it.

How do experts authenticate a painting?

The current consensus in the field describes a "three-legged chair": scientific analysis, provenance research, and connoisseurship, with no single leg sufficient on its own. A 2025 set of guidelines on the use of AI in authentication, published by the Zurich firm Art Recognition and a group of European specialists, restates that same tripod as foundational. The three legs work in sequence, from cheapest to most expensive, so the early steps screen out the obvious problems before anyone spends real money.

It usually starts with connoisseurship, the visual and historical analysis of a work by a specialist in that artist or period. A connoisseur compares brushwork, line quality, underdrawing, and the handling of paint against documented works, checks the signature and inscriptions, and asks whether the piece fits the artist's known chronology and the materials they used. An informal opinion can be free or a few hundred dollars. A written opinion from a recognized expert runs roughly $1,000 to $5,000, and a formal review for a major name can reach $10,000, often non-refundable whatever the verdict.

If the work survives that first look, it goes to the lab and the archive. Running connoisseurship first is economic. It is the cheapest filter, and many scientific tests require taking a microscopic sample, so you do not start cutting into a canvas before a specialist has said the work is worth pursuing. You spend the small money to decide whether the large money is justified.

What can forensic science prove about a painting?

Here is the part most people misunderstand about the laboratory. Science usually cannot tell you who painted a work. What it can do, with near-certainty, is tell you who did not, because a material that did not exist yet cannot appear in a painting that was supposedly made before it. That asymmetry is the whole power of forensics. It excludes.

The toolkit splits into imaging and materials analysis. Imaging includes X-radiography, which sees through the paint to reveal hidden compositions and earlier sketches; infrared reflectography, which exposes the underdrawing a forger often skips; and ultraviolet fluorescence, which lights up later restoration. Materials analysis identifies the actual substances: Raman spectroscopy and FTIR read pigments and binders, SEM-EDX reads elemental composition from a microscopic sample, and radiocarbon dating ages organic supports like canvas and wood. ArtDiscovery, one of the leading commercial labs, prices a full scientific analysis of pigments, binders, and elemental composition, plus radiocarbon dating, from $13,500 per work, with a turnaround of about four weeks.

The Knoedler case shows how the exclusion works in practice. Over roughly 15 years ending in 2008, the Knoedler gallery in New York sold about $70 million of forged Abstract Expressionist paintings, supposed Rothkos, Pollocks, and de Koonings, all actually painted by one man, Pei-Shen Qian, in a garage in Queens. The forgeries fooled experienced eyes for years. What undid them was the lab. Forensic analysis found modern synthetic pigments and materials, including a form of titanium white, in works supposedly made in the 1940s and 1950s, before those materials were commercially available at the claimed dates. The paintings could not be what they claimed to be. The gallery, in business since 1846, closed in 2011 and settled a series of lawsuits on confidential terms.

That is what we mean by risk management. A single chemical anachronism took $70 million of "blue-chip" inventory to zero.

Why does provenance matter as much as the painting itself?

Provenance is the documented history of an artwork's ownership, location, and exhibition, from the artist's studio to the present. It is often called the most important of the three pillars, because a continuous, well-documented chain is powerful evidence for both authenticity and clean legal title. Provenance research is billed by time rather than by test, typically $100 to $300 an hour. A focused inquiry might run $2,000 to $5,000, and a complex, multi-country investigation on a blue-chip work can reach $10,000 to $30,000 over several months.

The work is detective work. Researchers reconstruct the chain of owners through auction catalogs, dealer stock books, exhibition checklists, estate records, and correspondence that places the work in a specific collection at a specific time. They also check the documents themselves, because the paper can be forged as readily as the painting. And for twentieth-century works they verify the piece was not looted, a gap in the chain during the 1930s and 1940s is a red flag that can stall a sale for years.

The Orlando Museum of Art case is the cleanest recent example of provenance and forensics working together. In June 2022 the FBI seized 25 paintings attributed to Jean-Michel Basquiat from an exhibition at the museum, supposedly discovered in a storage unit. The provenance never held up, and then came the detail that ended the debate. One of the "Basquiats" was painted on the back of a FedEx box, and a typeface expert who had worked on the FedEx identity stated that the shipping label design on that box could not have been produced before 1994. Basquiat died in 1988. A painting cannot be made on a box that did not exist until six years after the artist's death. The museum's director was fired, and the works, once touted in the low-to-mid seven figures each, are now worth nothing.

What is a catalogue raisonne, and who issues the final word now?

A catalogue raisonne is the scholarly master list of every known work by an artist, with images, dimensions, media, provenance, and exhibition history for each one. For artists who have one, inclusion functions as the practical market test of authenticity. A work that appears in the catalogue can trade at full value at a major auction house. A work that is excluded, or simply absent, often cannot trade there at all. That is the gatekeeping power in one sentence: the catalogue can make a work liquid or make it unsaleable.

For decades that final word came from artist authentication boards, committees run by estates and foundations that issued binding "authentic" or "not authentic" opinions. Most of the major ones are now gone, and the reason is a story every investor should understand, because it is about incentives. The boards faced lawsuits from owners whose works they rejected, claims of defamation, disparagement, and in one case antitrust. They charged little or nothing for opinions, so they carried all the legal downside and none of the financial upside.

The Andy Warhol Art Authentication Board is the landmark. After defending suits including the antitrust case Simon-Whelan v. Andy Warhol Foundation, filed in 2007 over a rejected 1965 self-portrait, the Warhol entities reportedly spent on the order of $7 million in legal fees. The board stopped issuing opinions and was dissolved by 2012, even though the foundation prevailed. The committees and foundations for Basquiat, Keith Haring, and Roy Lichtenstein wound down their authentication work in the same period, and the Calder Foundation shifted to a "file-keeping" posture: it will open a file on a submitted work but will not call it genuine or fake. When you can win the lawsuit and still lose millions defending it, you stop offering the opinion. The whole market made that call at once.

So authentication today is more decentralized and, frankly, harder. With the boards gone, confidence now gets assembled from the catalogue raisonne where one exists, private opinions from independent scholars who frame their views as "scholarly opinion" rather than certification, scientific analysis from labs that take no position on the final attribution, and the vetting committees of the major auction houses. AI is arriving as a screening tool on top of that. Art Recognition's brushstroke-analysis system publicly assigned a roughly 91% probability that the National Gallery's Rubens Samson and Delilah is not by Rubens, which set off a fresh round of argument among scholars. The 2025 responsible-use guidelines are explicit that these tools are supporting evidence, not a final arbiter, and the published accuracy of research-grade models, around 71% in one 2024 study, is nowhere near good enough to stand alone.

The Bottom Line

  • Authentication rests on three pillars run in sequence: connoisseurship (the expert eye, from a few hundred dollars to roughly $10,000), forensic science (a full lab workup from about $13,500), and provenance research (billed by time, often $2,000 to $30,000 or more).
  • Science rarely names the artist, but it can exclude one with near-certainty, because a pigment or material that did not exist yet cannot appear in a work supposedly made before it, the finding that exposed roughly $70 million in Knoedler forgeries and the Orlando Museum's fake Basquiats.
  • Provenance is the documented ownership chain, and it carries as much weight as the object, because a continuous record supports authenticity and clean title while a gap, especially in the 1930s and 1940s, can stall a sale for years.
  • A catalogue raisonne is the practical market test of authenticity for artists who have one, and inclusion can be the difference between a work that trades at full value and one that cannot trade at all.
  • The major artist authentication boards have closed because defending lawsuits cost millions with no offsetting revenue, with the Warhol board's reported $7 million in legal fees and its 2012 dissolution as the template, so the final word now spreads across catalogues, scholars, labs, and auction-house vetting.
  • We treat authentication as the first line of risk management on any acquisition, because a lost attribution does not discount a work, it can erase it.

Sources

  1. Northern Arizona University, ARTCRIME, "Connoisseurship, Scientific Analysis, and Provenance." https://ac.nau.edu/artcrime/connoisseurship-scientific-analysis-and-provenance/
  2. Art Recognition / Center for Art Law, "Framework for Responsible Use of AI in Art Authentication" (November 2025). https://art-recognition.com/wp-content/uploads/2025/11/Framework-for-Responsible-Use-of-AI-in-Art-Authentication-final.pdf
  3. Center for Art Law, "Guidelines for AI and Art Authentication." https://itsartlaw.org/ai-and-art-authentication-guidelines/
  4. ArtDiscovery, "Art Authentication: Scientific and AI-Based Analysis." https://artdiscovery.com
  5. MyArtBroker, "Art Authentication: Human Expertise vs. Emerging Tech." https://www.myartbroker.com/collecting/articles/art-authentication-human-expertise-vs-emerging-tech
  6. MyArtBroker, "The Story of the Art Authentication Boards" (January 2026). https://www.myartbroker.com/collecting/articles/story-art-authentication-boards
  7. The Andy Warhol Foundation for the Visual Arts, FAQ. https://warholfoundation.org/about/faq/
  8. MyArtBroker, "The Basquiat Forgery Scandal at the Orlando Museum of Art" (January 2026). https://www.myartbroker.com/artist-jean-michel-basquiat/articles/the-basquiat-forgery-scandal-orlando-museum-of-art
  9. Hephaestus Analytical, "Art Authentication: The Ultimate Guide to Ensuring Artwork Authenticity." https://www.hephaestusanalytical.com/blog/art-authentication-the-ultimate-guide-to-ensuring-artwork-authenticity
  10. Navigating Art, "What Is a Catalogue Raisonne?" (November 2025). https://www.navigating.art/articles-from-navigatingart/what-is-a-catalogue-raisonn-and-answers-to-other-important-questions