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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"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。”

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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.

Pascal Cotte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。

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The stamp issue shows the granite ravine at La Cotte de St Brelade where excavations began 100 years ago.

BBC: Jersey Post mammoth stamps mark archaeological history

Some of the artefacts from La Cotte are on display at the Jersey Museum and also at La Hougue Bie.

BBC: Jersey Post mammoth stamps mark archaeological history

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