He uses what is called Raman spectroscopy, which can help detect historically inaccurate pigments. That’s what cut Beltracchi’s career short.  He was sentenced to six years in a German prison. His wife, Helene, to four. But the chaos they wrought has not been undone.  Now, galleries and auction houses who vouched for his forgeries have been sued by the collectors who bought them.
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From Oct. 19 to Oct. 26, 2017, the Toledo Museum of Art (TMA) is deaccessioning 68 objects from its antiquities collection through Christie’s auction house in New York. All information about these objects can be found online at Christie’s website. In response to inquiries concerning this sale, it is important to underscore TMA’s collecting philosophy as well as the Museum’s commitment to ensuring clear provenance of all of the objects in its collection.
Jack Flam suggested the paintings be sent for scientific testing to Jamie Martin, one of the world's top forensic art analysts. Martin showed us how he examined one of the fake Robert Motherwells using a stereomicroscope to study every millimeter of the painting's surface, and to select and then remove samples for identification. That's how he detected circular marks in the base layers, indicating an electric sander had been used to remove paint.
The copying of famous works of art dates to the origins of the history of art collecting and therefore to the beginning of the history of art. In the ancient world, replicas of famous works were made in order to satisfy demand by collectors for such works. The bronze Spear Bearer (c. 450–440 bce) by Greek sculptor Polyclitus, for example, achieved great renown for its perfect proportions and beauty. As a result, it was often copied in marble for Roman collectors in subsequent centuries. The copies, which are all that survived into the 21st century, made no pretense of being the original or having been made by Polyclitus.
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