Speculations about Mona Lisa he had had no access to the actual painting, said that after "every laboratory test possible" in 2004 and 2009 that "no inscriptions, letters or numbers, were discovered during the tests." and that "The ageing of the painting on wood has caused a great number of cracks to appear in the paint, which have caused a number of shapes to appear that have often been subject to over-interpretation". Speculations about Mona Lisa The 16th-century portrait Mona Lisa, or "La Gioconda" ("La Joconde"), painted in oil on a poplar panel by Leonardo da Vinci, has been the subject of a considerable
Mona Lisa (Prado's version) Sainte Anne", from 29 March to 25 June 2012. The oxidized varnishes indicated that the black repaint had been made 200 years after the copy was painted, that is to say, not before 1750. During this restoration process, the copy was also submitted to a study of infrared reflectography and radiography, where the results revealed that the painting had been made in the workshop of Leonardo da Vinci at the same time as the original "Mona Lisa" was painted. The "key" of this discovery was the underlying drawing, as it is the same but with different style in both paintings,