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。”
"I do not say that he was successful, in reproducing a stereo-vision effect, but if you want to achieve that this is the best way to do it," said Cotte.
柯特说：“我并不是说他在制造三维效果上做得很成功，但如果你想达到这种效果，这是最好的办法。”
Pascal Cotte said Leonardo built the painting up in layers, the last being a special glaze whose optical properties increased the illusion of a three-dimensional face.
PascalCotte认为达芬奇是分层完成名画《蒙娜·丽莎》的，油画的最上面一层是某种特殊的透明色料层，其光学特性增加了人物面部的三维立体效果。
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。
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。
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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