New Study Reveals Potentially Groundbreaking Drawing Hidden Beneath ‘Mona Lisa’

A new study on the Mona Lisa has revealed evidence of a charcoal underdrawing, suggesting for the first time that Leonardo da Vinci used a preparatory sketch to create the famous portrait.
The underdrawing, detected by multispectral analysis, was likely created using the spolvero technique, a method for transferring a sketch to canvas in which holes are pricked along the outline of an image and dusted with charcoal.
The study was conducted over a 15-year period by scientist Pascal Cotte, who pub