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Discussion at the forum "Rembrandt" sense?
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The research project "Rembrandt" (born Rembrandt Research Project) - the Amsterdam team of scientists, formed in 1968 for the study of Rembrandt's artistic heritage in order to verify its authenticity and the actual origin of the great artist's brush.

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Many of the works attributed to Rembrandt, were made by his pupils and apprentices and for centuries were sold under his name, by the middle of XX century there were more than a few thousand. Research project "Rembrandt" gave sensational results: pictures, previously known as Rembrandt's works, was denied authorship of the artist, which led to serious criticism of the project by the museum community.

To determine the authorship of works by Rembrandt was difficult even to his contemporaries, as Rembrandt often only with difficulty be distinguished from the works of other artists: Howarth Flink, John Livensa or Arent de Gelder. From paintings of Rembrandt in his studio often write copy and replicas. For example, we know the ten versions of the picture "Judas returned the thirty pieces of silver", which can not be clearly defined to attribute the artist. Sometimes, in order to identify the author, using archival documents, literary references, or engravings, reproductions, but they do not have sufficient reliability. In addition, natural-science research is conducted, as well as the work involves experts in the field of quality and stylistic peculiarities of the artist. So it is possible to establish similarities and differences in comparison with the works that have no supporting documentation.
Site http://www.rembrandtresearchproject.org/index.php?5