As with other members of the American Alliance of Museums (AAM), The Nelson-Atkins Museum of Art is making a concerted effort to research Nazi-era provenance for the paintings, sculptures, decorative arts, Judaica and works on paper in its collection to determine past ownership and, if necessary, to make proper restitution to the owners or the heirs. Following the standards and guidelines issued by the Association of Art Museum Directors (AAMD) and AAM, the Museum is currently conducting research on works of art in its collection that were created before 1946 and acquired by the Museum after 1932* that changed hands, or might have changed hands, in continental Europe between 1933 and 1945, and/or could have been spoliated by the Nazis and not subsequently restituted to their rightful owners. In accordance with AAM and AAMD standards and guidelines, the Museum is prioritizing research on European paintings, sculpture, drawings and Judaica, though research will eventually cover all accessioned objects identified as containing Nazi-era provenance.
* Names of previous owners do not constitute valid provenance unless they provide concrete and irrefutable proof that the work of art in question is by the artist who the seller says it is by. For example, if an individual is listed as being the owner of the particular work of art in question in a museum exhibit catalog about the artist, this would constitute valid provenance.

The commonest motivation for fraudulence is monetary gain. Fraudulence is most likely to occur when the demand for a certain kind of work coincides with scarcity and thus raises the market prices. Unprincipled dealers have encouraged technically skilled artists to create forgeries, occasionally guiding them to supply the precise demands of collectors or museums. This is by no means a modern phenomenon: in the 1st and 2nd centuries ad, sculptors working in Rome made replicas of Grecian works to satisfy the demands for the greatly admired Grecian sculpture of the preceding five centuries. These copies or adaptations apparently were not offered as contemporary work but as booty from Greece at the extraordinarily high prices paid for such works in imperial Rome. Similar circumstances may account for the “discovery” of a manuscript or autograph by a dead author or composer, although many such finds are quite legitimate and have been authenticated.

The anonymity of buyers is also a huge advantage for criminals. Who hasn’t seen the images of an art auction for a famous painting at Christie’s or Sotheby’s, where brokers are on the phone with mysterious clients? Art market operators generally refuse to disclose the identities of their clients under the guise of “protecting the integrity of the transactions.”
From Oct. 19 to Oct. 26, 2017, the Toledo Museum of Art (TMA) is deaccessioning 68 objects from its antiquities collection through Christie’s auction house in New York. All information about these objects can be found online at Christie’s website. In response to inquiries concerning this sale, it is important to underscore TMA’s collecting philosophy as well as the Museum’s commitment to ensuring clear provenance of all of the objects in its collection.
At times restoration of a piece is so extensive that the original is essentially replaced when new materials are used to supplement older ones. An art restorer may also add or remove details on a painting, in an attempt to make the painting more saleable on the contemporary art market. This, however, is not a modern phenomenon - historical painters often "retouched" other artist's works by repainting some of the background or details.
Meeting with the undercover agent in May 2001, Katzen suggested exporting the Modigliani and Degas out of the U.S. for resale, which could take "six months to one year," the indictment says. Katzen proposed to the agent that they build up an inventory in Europe to be marketed "creatively" and that they establish a long-term relationship in moving "large amounts," the indictment says. To assure the would-be buyer, documents were sent to establish authenticity, the indictment says.
Portrait of a Woman, attributed to Goya (1746-1828). X-ray images taken of this painting in 1954 revealed a portrait of another woman, circa 1790, beneath the surface. X-ray diffraction analysis revealed the presence of zinc white paint, invented after Goya's death. Further analysis revealed that the surface paint was modern and had been applied so as not to obscure the craquelure of the original. After analysis, the conservators left the work as you see it above, with portions of old and new visible, to illustrate the intricacies of art forgery, and the inherent difficulty of detecting it.

Forgery, in art, a work of literature, painting, sculpture, or objet d’art that purports to be the work of someone other than its true maker. The range of forgeries extends from misrepresentation of a genuine work of art to the outright counterfeiting of a work or style of an artist. Forgery must be distinguished from copies produced with no intent to deceive.

Sack discussed transferring the proceeds from the resale to an offshore account, the agent's affidavit says, and the dealers explained that the buyer would see a net loss in funds. When the undercover agent mentioned normally paying "10% to 15%" to launder money, Katzen said the works could easily be sold at a 10% discount, the affidavit says. Katzen said he would move the money very, very slowly, the affidavit says, and told the agent he had a client in Europe who was ready to buy the Modigliani "under these circumstances."
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In the last decade, reported revenues from the Chinese auction market have expanded ninefold, now higher than those of its American counterpart. Records have been set for Chinese masters that compete with the West’s already inflated prices for Warhol and Picasso — if such records even end up holding, given some buyers who are refusing to pay because of doubts about authenticity.
For example, federal prosecutions have been successful using generalized criminal statutes, including the Racketeer Influenced and Corrupt Organizations Act ("RICO"). A successful RICO charge was brought against a family which had sold counterfeit prints purportedly by Chagall, Miró, and Dalí. The defendants were also found guilty of other federal crimes including conspiracy to defraud, money laundering, and postal fraud.[26] Federal prosecutors are also able to prosecute forgers using the federal wire fraud or mail fraud statutes where the defendants used such communications.
Beltracchi spent a year and a half in this grim penitentiary, but is now allowed to spend many days at home, where he is launching a new career. Beltracchi is painting again and is signing his works Beltracchi.  He needs to get his name out there, which is probably why he agreed to talk to us. He's lost everything is now facing multiple lawsuits totaling $27 million.
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John (American, 1777-1851) and Hugh (American, 1781-1830) Finlay, Card Tables in the Neo-Classical Taste, c. 1825, Mahogany, maple, pine, and poplar, painted and paint-grained rosewood, and gilded, with gilt-brass toe caps and castors and die-stamped rosettes, and red velvet in the wells, 28 7/8 x 35 7/8 x 17 ¾ in. (73.34 x 91.12 x 45.09 cm), Mr. and Mrs. Robert J. Barber Art Fund, 2016.3-.4.

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Despite those advances, the detection of fraudulent art remains a complex undertaking. It is particularly difficult to weed out forgeries in the work of modern artists whose large numbers of works and superstar statuses make them especially attractive to those who commit fraud. Pablo Picasso, for example, was a prolific artist, creating a huge number of works on canvas and on paper as well as sculptures and ceramics. Considering his vast output and the varying styles and media in which he worked, scholars have had difficulty establishing a definitive corpus for him. The prestige associated with owning a Picasso and the difficulty of attribution, especially for a drawing, made and continues to make fraudulent representations of his work hard to police.
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