Cotte said: "That could explain why the eyebrows have disappeared – they have faded because of chemical reactions or they have been cleaned off. ""

柯特说：“这可以解释为什么眉毛不见了，可能是由于化学反应褪色了，或是被擦掉了。”

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For example, infra-red imaging shows Leonardo moved the position of a finger on the left hand "to give a more relaxed position, consistent with the smile", Cotte said.

例如，红外成像结果显示，达芬奇改变了蒙娜·丽莎左手一个手指的位置，从而让蒙娜·丽莎的姿势更放松，与她的微笑保持一致。

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Pascal Cotte said da Vinci built the painting up in layers, the last being a special glaze whose optical properties increased the illusion of a three-dimensional face.

帕斯卡尔·柯特称，达芬奇在绘制这张画时使用了多层颜料，最表面的一层使用了一种特殊釉料，这种颜料的光学性能可增加人物面部的三维效果。

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He said: "The collapsed site of La Cotte is world famous for the archaeology and palaeontology that it contained, " he said.

BBC: Jersey Post mammoth stamps mark archaeological history