Philip Byler, Broadening’s lawyer in New York, said that the inaccurate invoices were merely a shortsighted attempt by the art dealer that Broadening hired to save importation fees. “It was not done with the intention of smuggling,” he said. He also challenged the Brazilian authorities’ claim, saying that “Hannibal” was legally purchased from a company owned by Mr. Ferreira’s wife.
Though there are no hard statistics on the amount of laundered money invested in art, law enforcements officials and scholars agree they are seeing more of it. The Basel Institute on Governance, a nonprofit research organization in Switzerland — the site of the world’s premier contemporary and Modern art show — warned last year of the high volume of illegal and suspicious transactions involving art. But regulation has been scattershot and difficult to coordinate internationally.
Prosecution is also possible under state criminal laws, such as prohibitions against criminal fraud, or against the simulation of personal signatures. However, in order to trigger criminal liability under states' laws, the government must prove that the defendant had intent to defraud. The evidentiary burden, as in all criminal prosecutions, is high; proof "beyond a reasonable doubt" is required.[27]
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.
The copy is the easiest forgery to make and is usually the easiest to detect. When a duplicate has appeared the problem is merely to determine which is the original and which is the copy. At least a dozen excellent replicas of Leonardo da Vinci’s Mona Lisa exist, many of them by his students. Various owners of these copies have at various times claimed that they possess the original. The Louvre is satisfied that it owns the painting by Leonardo because close examination reveals slight changes in the composition underneath the outermost layer of paint, and because this painting has an unbroken record of ownership from the time that the artist painted it.
Knoedler’s fantastic tale of fraud begins in the early 1990s on the streets of Manhattan. That’s where a former waiter from Spain, Jose Carlos Bergantiños Diaz, came upon a Chinese artist peddling canvases on the sidewalk. Bergantiños approached the man, Pei-Shen Qian, and said that he had friends who wanted works by esteemed artists but could not afford the real things. Could Pei-Shen duplicate paintings for them? Bergantiños reportedly offered $500 per copy.

Any art object—paintings, sculpture, jewelry, ceramics, fine furniture, and decorative pieces of all kinds—can be forged. The difficulty of forging, however, is as important as market price in determining what is forged. Probably fewer than 1 percent of stone sculptures are false because they require so much labour to make and their market is limited, but as many as 10 percent of modern French paintings on the market may be forgeries. The technical difficulties in making a convincing imitation of an ancient Greek vase are so great that forgeries are almost nonexistent. In contrast the forgery level of tiny archaic Greek and Cretan bronze statuettes, which are simple to cast, is possibly as high as 50 percent. A forger is most likely to succeed with a mediocre piece in the middle price range because such a piece probably will never be subjected to definitive examination. Although the price should be low enough to allay suspicion, the object can still yield a fair return for the effort expended by the forger.

An expert certification can mean the difference between an object having no value and being worth a fortune. Certifications themselves may be open to question. Jacques van Meegeren forged the work of his father Han van Meegeren (who in his turn had forged the work of Vermeer). Jacques sometimes produced a certificate with his forgeries stating that a work was created by his father.
The Internet has put a new spin on the old crime. The rise of online banking institutions, anonymous online payment services and peer-to-peer (P2P) transfers with mobile phones have made detecting the illegal transfer of money even more difficult. Moreover, the use of proxy servers and anonymizing software makes the third component of money laundering, integration, almost impossible to detect—money can be transferred or withdrawn leaving little or no trace of an IP address.
Aging (artwork) Anastylosis Arrested decay Architecture Cradling (paintings) Detachment of wall paintings Desmet method Historic paint analysis Imaging of cultural heritage Inpainting Kintsugi Leafcasting Lining of paintings Mass deacidification Mold control and prevention in libraries Overpainting Paper splitting Radiography of cultural objects Reconstruction (architecture) Rissverklebung Textile stabilization Transfer of panel paintings UVC-based preservation
The copying of famous works of art dates to the origins of the history of art collecting and therefore to the beginning of the history of art. In the ancient world, replicas of famous works were made in order to satisfy demand by collectors for such works. The bronze Spear Bearer (c. 450–440 bce) by Greek sculptor Polyclitus, for example, achieved great renown for its perfect proportions and beauty. As a result, it was often copied in marble for Roman collectors in subsequent centuries. The copies, which are all that survived into the 21st century, made no pretense of being the original or having been made by Polyclitus.