How To Save Da Vinci's Self-portrait Using Physics

One of Leonardo da Vinci's masterpieces, a self-portrait, was drawn in red chalk on paper during the early 1500s. As you can imagine, a chalk drawing on paper from the Renaissance is in extremely poor condition. Centuries of exposure to humid storage conditions and a lack of understanding about preservation has led to widespread and localized yellowing and browning of the paper, which is reducing the contrast between the colors of chalk and paper and substantially diminishing the visibility of the drawing - but a group of researchers from Italy and Poland are trying to help.  read more

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