Museum finds earliest 'Mona Lisa ' copy . Researchers think they 've found da Vinci 's 's `` Mona Lisa '' Pigment found on a hidden wall match ` ` The Battle of Anghiari '' paint , they say . The mayor of Florence wants the Florence government to approve more study . The wall is in the Hall of the 500 of the Palazzo Vecchio , the seat of Italian government .
Researchers think they 've found da Vinci 's 's `` Mona Lisa '' Pigment found on a hidden wall match `` The Battle of Anghiari '' paint , they say . The mayor of Florence wants the Florence government to approve more study . The wall is in the Hall of the 500 of the Palazzo Vecchio , the seat of Italian government .