Scan yields a reproduction of the 'Mona Lisa 's ' face magnified 24 times . Image reveals a single brushstroke of a single hair above the left brow . Engineer suggests faded pigment could explain lack of lashes and brows . Comment:
Scan yields a reproduction of the 'Mona Lisa 's ' face magnified 24 times . Image reveals a single brushstroke of a single hair above the left brow . Engineer suggests faded pigment could explain lack of lashes and brows . A poor attempt to clean the painting could also have erased the features .