柯特使用一款240兆像素的相机揭开了有关蒙娜丽莎的很多谜团。这款相机可以精确地测量亮度，能够透过表层“直视”下面的层次。
For example, infra-red imaging shows da Vinci moved the position of a finger on the left hand "to give a more relaxed position, consistent with the smile", Cotte said.
例如，从红外图像可以看出，达芬奇在作画时改动了蒙娜丽莎左手一根手指的位置。柯特说：“这个位置给人的感觉更放松，与她的微笑很相称。”
He said the Mona Lisa looked "totally different" 500 years ago, when it had a blue sky and the subject's skin had not yellowed.
他称，五百年前的蒙娜丽莎和现在“完全不同”，当时画上背景的天空是蓝色的，人物的肤色也没有变黄。
The underlying layers of the face - painted using lead white and mercury vermillion - also show it was wider than the end result appears.
此外，从使用铅白和银朱绘制的面部以下的层次可以看出，蒙娜丽莎的脸部原本比现在宽。
"The smile, the glance, the face were all wider," said Cotte.
柯特说：“蒙娜丽莎的笑容、眼睛和脸部都比现在宽。”