Art forgery dates back more than two thousand years. Roman sculptors produced copies of Greek sculptures. Presumably[clarification needed] the contemporary buyers knew that they were not genuine. During the classical period art was generally created for historical reference, religious inspiration, or simply aesthetic enjoyment. The identity of the artist was often of little importance to the buyer.
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The following year, in 2013, an even more high-profile laundering case surfaced when a Jean-Michel Basquiat painting worth $8 million was found in a crate at Kennedy Airport on its way from London. The crate went through customs with a valuation of $100, though it contained Basquiat’s 1982 painting Hannibal (commodities valued under $200 aren’t required to be declared at customs.) The painting had been bought and shipped by Brazilian Banker Edemar cid Ferreira in an elaborate scheme to launder over $50 million that was illegally obtained when Ferreira’s bank, Banco Santos, went bankrupt. In 2004, Ferreira went $1 billion in debt after his financial empire, much of which was built on embezzled funds, collapsed. During his reign over Banco Santos, he had bought 12,000 pieces of art. In 2006, Ferreira was sentenced to 21 years in prison for bank fraud, tax evasion, and money laundering. But before his arrest, $30 million of his art collection was smuggled out of Brazil. The scheme was uncovered when Hannibal was found at JFK. According to court papers, the painting was originally bought for $1 million in 2004 by a Panamanian company called Broadening-Info Enterprises, which was later discovered to be owned by Ferreira’s wife, Márcia.
These are all Pei-Shen Qian's forgeries. Incredibly, he was able to copy the style and technique of not just one major artist, but many of the giants of the 20th century: Jackson Pollock, Willem de Kooning, Richard Diebenkorn, Barnett Newman, Clyfford Still, Franz Kline, Lee Krasner, Mark Rothko and others. He forged 63 works that sold for more than $80 million to collectors.
   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.
The Art Loss Register (ALR), founded in 1991, grew out of the International Foundation for Art Research (IFAR: founded 1969), a not-for-profit organization that initiated and maintained (until 1997) an international database of stolen works of art, antiques, and collectables. After 1998 ALR assumed maintenance, although IFAR retains ownership, and the two organizations work closely together.

Motivations- check, he gives you that, details of specific works- check he gives you that, but I was hoping for some information on HOW they forge things, why, if they have that kind of talent do they not do their own (other than money, and of course risk), how they can tell (lightly touched on) that it was forged. This is a good overview book, but not detailed, not for someone who has huge curiosity about the field of art forgery. Start here, but if you are wondering more, keep looking.
In this context, the provenance can occasionally be the detailed history of where an object has been since its creation,[26] as in art history contexts – not just since its modern finding. In some cases, such as where there is an inscription on the object, or an account of it in written materials from the same era, an object of study in archaeology or cultural anthropology may have an early provenance – a known history that predates modern research – then a provenience from its modern finding, and finally a continued provenance relating to its handling and storage or display after the modern acquisition.
It is hard to imagine a business more custom-made for money laundering, with million-dollar sales conducted in secrecy and with virtually no oversight. What this means in practical terms is that “you can have a transaction where the seller is listed as ‘private collection’ and the buyer is listed as ‘private collection,’ ” said Sharon Cohen Levin, chief of the asset forfeiture unit of the United States attorney’s office in Manhattan. “In any other business, no one would be able to get away with this.”
An important strategy for combating that type of art fraud is research into the history of ownership of the work (called provenance) and the mention of the work in archival records. Genuine works of art appear in historical records and are owned by individuals, and one way to determine the authenticity of a work is to establish that kind of history. Marks of ownership, such as owners’ stamps, may be found on the object itself, or dates signifying change in ownership may be written on the object. Needless to say, historical marks on a work can also be forged, so provenance research alone is not sufficient to determine authenticity.