“Deaccessioning” is defined as the process by which an artwork (or other object) is permanently removed from a museum’s collection. Proceeds received from the sale of deaccessioned artworks must be used by art museums for the acquisition of other artworks. As such, U.S. and international professional organizations have long upheld the role of deaccessioning as vital to the care of collections. Some nationally funded museums do not allow deaccessioning under any circumstances, and internationally it is not as prevalent as it is in America, where many museums are privately funded. The Toledo Museum of Art respects that there are different points of view, but American art museums have upheld the practice of judiciously managing collections.
An art forger must be at least somewhat proficient in the type of art he is trying to imitate. Many forgers were once fledgling artists who tried, unsuccessfully, to break into the market, eventually resorting to forgery. Sometimes, an original item is borrowed or stolen from the owner in order to create a copy. Forgers will then return the copy to the owner, keeping the original for himself. In 1799, a self-portrait by Albrecht Dürer which had hung in the Nuremberg Town Hall since the 16th century, was loaned to Abraham Wolfgang Küfner [de]. The painter made a copy of the original and returned the copy in place of the original. The forgery was discovered in 1805, when the original came up for auction and was purchased for the royal collection.

A common narrative used by art scammers is to say their wife has been looking at your work and really enjoys it. Or, they have a new home and are looking for pieces to decorate it. At first glance, it may seem like a plausible story, but something about it seems abrupt or stunted. If they don’t use your name or any details about the works they are looking at, it is probably not legitimate.
As for you artists, firmly establishing yourself as link number one in the chain of provenance is essential. These days, proof of authenticity or authorship accompanying a work of art is more important than ever. In order to prevent unscrupulous sellers from trafficking in fakes, and avoid situations where people question your art, keep good records right from the start and provide some form of documentation with every artwork you produce. The last thing you want is people trying to figure out whether or not you actually created certain works, or contacting you with requests to authenticate works that have no accompanying paperwork or documentation. The bad news is that in the long run, repeated incidents surrounding undocumented art can actually compromise your market. So make sure there's never any doubt that ownership of your art begins with you. Read more about how to do that in this article about How to Authenticate Your Art.

A peculiar case was that of the artist Han van Meegeren who became famous by creating "the finest Vermeer ever"[7] and exposing that feat eight years later in 1945. His own work became valuable as well, which in turn attracted other forgers. One of these forgers was his son Jacques van Meegeren who was in the unique position to write certificates stating that a particular piece of art that he was offering "was created by his father, Han van Meegeren".[8]
A variation in composite forgery, quite common with inlaid French furniture, involves the use of parts from damaged but genuine pieces to create a single complete piece that may or may not resemble one of the pieces from which it has been made. These made-up pieces are still considered forgeries. In composites of archaeological material only one part may be ancient, the balance being made up to complete the object. The head of a small terra-cotta figure may be ancient, the body and limbs of modern workmanship. A single ancient element in a composite forgery will help to deceive the buyer.
Some forgers have created false paper trails relating to a piece, in order to make the work appear genuine. British art dealer John Drewe created false documents of provenance for works forged by his partner John Myatt, and even inserted pictures of forgeries into the archives of prominent art institutions.[11] In 2016, Eric Spoutz plead guilty to one count of wire fraud related to the sale of hundreds of falsely attributed artworks to American masters accompanied by forged provenance documents. Spoutz was sentenced to 41 months in federal prison and ordered to forfeit the $1.45 million he made from the scheme and pay $154,100 in restitution.[12]

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.

It is important to note that objects identified as containing a Nazi-era provenance are not assumed to have been looted during the Nazi era or to have been acquired illegally. Rather, by making this information available to the public, the Nelson-Atkins provides an opportunity for additional information to be made available and fulfills its mission to steward responsibly the collections in its care.

One of the more-complicated examples is that of the Getty kouros, an allegedly 6th-century-bce male sculpted figure owned by the J. Paul Getty Museum in Los Angeles that has long been suspected of being a modern forgery. The Getty paid a very high price for what it believed may have been the last remaining such figure on the art market only to find that the sculpture had stylistic irregularities that suggested that it could not be authentic. At the same time, scientific tests have not demonstrated that it is of modern origin, and some scholars have argued that stylistic anomalies do not prove that it is a fake. The Getty Villa exhibited the work in its galleries with a label that read: “about 530 bc or modern forgery.” However, the kouros was removed from view when the museum completed a yearlong renovation in 2018, with the director stating that the sculpture was fake.
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The Responsible Art Market, or RAM, is an industry-supported not-for-profit organization which describes itself as ‘”[r]aising awareness of risks faced by the art industry and providing practical guidance on establishing and implementing responsible practices to address those risks.”  On its website, RAM provides both an Art Transaction Due Diligence Toolkit, as well as Guidelines on Combatting Money Laundering and Terrorist Financing (“AML Guidelines”).  The AML Guidelines are similar to the protocols set forth by the Basel Institute, but provide slightly more concrete detail.  They set forth eight basic principles:
Technical analysis, an objective approach, rests on an arsenal of equipment and tests. The fundamental principle is the comparison of a suspected work with a genuine work of the same artist or period. The suspected piece must show the same pigments or materials used and comparable age deterioration. Inconsistencies automatically cause the piece to be suspect. Oil paintings dry out and develop a crackle, bronzes oxidize, and ancient glass buried in the ground develops iridescent layers. The microscope is the most useful basic tool: a close examination of the physical condition often will show if the aging is genuine or has been artificially induced. The type of tools used by the artist can be detected from an examination of their telltale traces.
   Some criterion for judging the monetary value for all this art was needed, and the most readily available one was the identity of the artist. First, this took the form of mark on the work, and later a signature. As the demand for fine art far exceeded the supply, misuse of these marks and signatures became rampant. Controlling legislation was enacted as it always is whenever commerce enters the picture, and the formerly respected tradition of copying art became art forgery.
Art scammers have one objective and that is to separate the artist from their art or from their money, or both.  When approached by a stranger on the Internet, always be aware of and skeptical of phony emails and solicitations.  The old adage that says “when it sounds too good to be true…” still stands true today.  All artists should be aware of and comfortable with whom they are dealing with when they are selling their art on the Internet.
Forgeries again came into play at Turkey’s State Art and Sculpture Museum in Ankara, where a group of museum officials and criminals are believed to have teamed up to steal some 302 works from the institution between 2005 and 2009. The crime was discovered in 2012, when the museum realized that 46 pieces in the collection had been replaced by copies. Another 30 works also raised suspicion.

Sometimes provenance can be as simple as a photograph of the item with its original owner. Simple yet definitive documentation such as that can increase its value by an order of magnitude, but only if the owner was of high renown. Many items that were sold at auction have gone far past their estimates because of a photograph showing that item with a famous person. Some examples include antiques owned by politicians, musicians, artists, actors, etc.[6]

Regardless of whether this provision ultimately is enacted, the underlying issue will persist.  This post discusses some of the general concerns that the art and antiquities world can be misused as a conduit for dirty money.  We then discuss the AML Standards for Art Market Operators proposed by the Basel Institute on Governance, and similar standards set forth by the Responsible Art Market, both of which attempt to set forth a framework for those in the business of trading art to mitigate their money laundering risks.
^ Tan, Yu Shyang; Ko, Ryan K.L.; Holmes, Geoff (November 2013). "Security and Data Accountability in Distributed Systems: A Provenance Survey". 2013 IEEE 10th International Conference on High Performance Computing and Communications & 2013 IEEE International Conference on Embedded and Ubiquitous Computing. IEEE: 1571–1578. doi:10.1109/hpcc.and.euc.2013.221. ISBN 9780769550886.

Contact an art advisor to help you find a buyer for your work or see if an auction house like Sotheby’s or Christie’s wants to auction it for you. If they help you sell your collection, they will make money, so it’s in their best interest not to ask any questions. Make an appointment with an auction house to appraise the pieces in your collection. You’ll sign a contract that says you are allowing the auctioneers to sell your collection on consignment, which means if it sells you get paid, and if it doesn’t you get the art returned to you. It will also tell you what sort of fees you will be charged - like insurance, shipping, and the auction house’s cut. You’ll ship the work to the auction house, wait for your collection to be sold, and make it rain.
It is important to note that objects identified as containing a Nazi-era provenance are not assumed to have been looted during the Nazi era or to have been acquired illegally. Rather, by making this information available to the public, the Nelson-Atkins provides an opportunity for additional information to be made available and fulfills its mission to steward responsibly the collections in its care.
Edward Winkleman tells us that “transfer of title for digital art happens with an invoice. The collector generally receives a certificate of authenticity, which is required if they ever want to resell or donate the work to a museum. The artwork could indeed be delivered digitally, and payment could indeed be received digitally, but the bank records will show the transaction.”
In a market depressed and made anxious by fakes, investors and private collectors may start pulling out, leaving more room for museums to buy at prices they can afford, which in turn would be good news for any art lover who depends on our public collections. And, since museums don’t have to think about net worth and reselling (let’s forget the Detroit case for a moment), they can live with the risk of maybe having bought a fake. Their audience might still enjoy and learn from the new “Rothko” in the collection.

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When you sell your home the paperwork details the sale, including your name, and the title search lists the names of the people who owned the property before you. But when someone sells an artwork at auction — even something worth $100 million, much more than your house — the identity is typically concealed.  […] In finance, Treasury officials last year began asking banks to identify customers who set up accounts in names of shell companies. In real estate, they introduced a pilot program that requires the full identification of people who buy expensive properties in New York and Miami using cash and shell companies.
The Rothko even came with a romantic back story. As explained to the De Soles by Ann Freedman, then the highly regarded president of Knoedler & Co. — founded in 1846 and Manhattan’s oldest art gallery — it emerged from the collection of a mysterious Swiss heir. The man’s business-traveling father bought paintings directly from rising art stars of the 1950s. Freedman added that the piece, depicting Mark Rothko’s signature-style rectangles, had gone largely unseen by art-world cognoscenti.