Dating lines decoded
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Above all, the way the flesh is rendered gives rise to many comments because of its crucial role in the fascination exerted by Leonardo's portraits.
"The thinness of the glaze layers must be underlined: it confirms the dexterity of the painter to apply such thin layers.
Fortunately for Standing Rock protesters, a governor spokesman refuted the blockade threat by Tuesday afternoon.
Jeff Zent minced no words when he stated that Herr had been mistaken when issuing her threat against the Standing Rock protesters and their supply line.
Writing in the scientific journal Angewandle Chemie, Dr Philippe Walter, who led the study, said: "The perfection of Leonardo da Vinci's painting technique has always been fascinating.