According to Walther, approximately 70–90 percent of artworks that his organization examines on behalf of collectors and dealers end up not being by the artist claimed.

The institute charges up to €15,000 (,000) to verify paintings through a range of techniques.

Though science has its limitations in authentication, it has long been used to identify fakes and forgeries of everything from priceless paintings to baseball cards, Ming vases to advertising posters.

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Simple black light examination showed these forgeries were made with materials too modern for the subject.

Ultraviolet light is invisible to the human eyes, but when shined on a material the material will often fluoresce or glow in the dark.

Some of the biggest forgery cases have been solved in part due to ultraviolet light examination.

This includes the infamous Hitler diary fakes of the 1980s and the forged photos of photographer Man Ray.

Others require more extensive and more expensive tests.

Located in the Geneva Freeport, which holds over one million artworks, the institute has no shortage of works to verify.Forgery must be distinguished from copies produced with no intent to deceive.The most common type of fraudulence in art is forgery—making a work or offering one for sale with the intent to defraud, usually by falsely attributing it to an artist whose works command high prices.Previously, art historians had called upon scientists to compare the alleged Léger painting from the Peggy Guggenheim Collection, in Venice, Italy, with an authentic painting of the 'Contraste de formes' series belonging to the Solomon Guggenheim Foundation in New York, USA.They performed tests based on techniques including X-ray radiography and scanning electron microscope and energy dispersive X-Ray spectrometry.Ultraviolet light Ultraviolet light is one of the most used and useful tools for authentication and fake detection.