The New York Times has reported the re-attribution of one of the Metropolitan Museum of Art's painting's to VelÃ¡zquez following cleaning. The Museum's "Portrait of a Man" was previously considered a product of the artist's workshop rather than an autograph piece. However, cleaning has removed aged yellow varnish and unsympathetic retouching to reveal subtleties considered the mark of VelÃ¡zquez's own hand. Leading experts on the artist have proposed that the painting once again be considered the work of the master himself.
It is believed that the painting was actually conceived as a study rather than a finished piece. To read more about the discovery, see the New York Times article.