Many forgeries still escape detection; Han van Meegeren, possibly the most famous forger of the 20th century, used historical canvasses for his Vermeer forgeries and created his own pigments to ensure that they were authentic. He confessed to creating the forgeries only after he was charged with treason, an offense which carried the death penalty. So masterful were his forgeries that van Meegeren was forced to create another "Vermeer" while under police guard, to prove himself innocent of the treason charges.
Art fraud, the deliberately false representation of the artist, age, origins, or ownership of a work of art in order to reap financial gain. Forgery of a famous artist’s work is the best-known kind of art fraud, but fraud may also result from the knowing misattribution of the age or origin of a work of art—if, for example, an art dealer were to falsely assert that a statue was from 5th-century-bce Greece or that a vase was from the Chinese Ming dynasty, for the purpose of making a greater profit, because works from those particular regions or time periods are deemed more valuable on the contemporary art market. Art theft for resale is also a form of art fraud.