From a recent item via Agence France-Presse, about the Geneva-based Fine Arts Expert Institute:
"The ballooning amounts up for grabs have also hiked the incentive for art forgers, and scientists like Walther and Mottaz are increasingly being called upon to supplement efforts by traditional art experts and conservationists to authenticate works. ...Experts estimate a full half of all artworks in circulation today are fake -- a number that is difficult to verify but that Walther says is, if anything, an underestimate. Between 70 and 90 percent of works that pass through FAEI turn out to be fake, he says."
Related: Authorities publicly identify the painter responsible for the works involved in the recent Knoedler forgery scandal.
image: Adrian Ghenie, "The Fake Rothko," oil on canvas, 2010