Original sentence: "The Mark of a Masterpiece" by David Grann, The New Yorker, vol.20, July 12 & 19, 2010,  The presence of holes in the page shows it was once part of the Sforziade a manuscript kept in Warsaw, this fact points to its originality.40 cm × 60 cm.A date in the late 15th or 16th century has been confirmed by scientific testing.A painting discovered in 2008 near Naples, maybe the original self-portrait of Leonardo da Vinci, is actually under deep restoration in order to obtain further proofs of the authenticity.Alternately attributed to Cristofano dell'Altissimo.As of 2010 the methods used to analyse the fingerprint have come into question.Discovered in 2008 in a private collection and identified as a self-portrait by Peter Hohenstatt and others.Fingerprints match those found on the Lady with the Ermine.Identified as a Leonardo by Martin Kemp on stylistic grounds, and confirmed using the evidence of a fingerprint.It has been validated by scholars like Peter Hohenstatt (University of Parma), Alessandro Tomei (University of Chieti-Pescara), Jan Royt (University of Prague), David Bershad (University of Calgary) and Orest Kormashov (University of Tallinn).LXXXVI, no.Lucan Portrait of Leonardo.Lucan Portrait of Leonardo da Vinci.Museo delle Antiche Genti di Lucania, Vaglio Basilicata.Other experts have not agreed with this attribution.Self-portrait of Leonardo, Surrentum Online, accessed 2010-11-06.The Carbon-14 analysis, the chemical analysis of the painting used and the "pentimento" sketches found under the painting may suggest the autography of the painting.The resemblance with the Uffizi 17th century copy of the "Self portrait of Leonardo da Vinci" is striking.Vaglio Basilicata, Museo delle Antiche Genti di Lucania.tempera grassa on poplar
Edited sentence: He has been found to be a con artist since then.Identified as a Leonardo by Martin Kemp on stylistic grounds, and confirmed using the evidence of a fingerprint by Paul Biro.The presence of holes in the page shows it could have been part of the Sforziade a manuscript kept in Warsaw