Among the forgers who have tried to make the experts look foolish is George Psalmanazar (1679?–1763). A Frenchman, he went to England where he pretended, with great success, to be a native of Formosa (Taiwan), and published a book about that island, which he had never visited. Another is William Lauder, who attempted to prove John Milton guilty of plagiarism by quoting 17th-century poets who wrote in Latin, into whose works he had interpolated Latin translations from Paradise Lost. A forgery made as a joke but taken seriously was the “Ern Malley” poems, offered to an Australian magazine in 1944 as the work of a recently dead poet. Actually it was composed by two young soldiers who wished to ridicule certain aspects of contemporary poetry.
Fraudulent misrepresentations are one thing, but do sellers who proudly “stand behind the works they sell” really intend to be strictly liable (i.e., without fault) for any error or omission in the provenance or exhibition history? Do sellers undertake to do independent investigations of the provenance, or do they just pass along the same information they received when the work was acquired? In practice, more sophisticated art market participants, such as the major auction houses, include disclaimers (in fine print) in their terms and conditions of sale, but when smaller galleries and dealers sell art they rarely incorporate such protections against liability for faulty or inaccurate information.
Provenance – also known as "custodial history" – is a core concept of archival science and archival processing. The term refers to the individuals, groups, or organizations that originally created or received the items in an accumulation of records, and to the items' subsequent chain of custody. The principle of provenance (sometimes also termed the principle of archival integrity or respect des fonds) stipulates that records originating from a common source (or fonds) should be kept together – where practicable, physically; but in all cases intellectually, in the way in which they are catalogued and arranged in finding aids. Conversely, records of different provenance should be preserved and documented separately. In archival practice, proof of provenance is provided by the operation of control systems that document the history of records kept in archives, including details of amendments made to them. The authority of an archival document or set of documents of which the provenance is uncertain (because of gaps in the recorded chain of custody) will be considered to be severely compromised.
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.