In 2012, the Prado Museum restored a copy of the Mona Lisa made by an apprentice. It revealed the original 1517 colour. By morphing the apprentice's portrait and background: an accurate colour restoration of da Vinci's is possible. Base Layer from C2RMF, additional varnish/crack removal was applied. Eyebrows are added back -somewhat- because they were believed to have been removed during overcleaning in previous centuries. By Daniel Voshart
<bdi><a href="https://en.wikipedia.org/wiki/en:Leonardo_da_Vinci" class="extiw" title="w:en:Leonardo da Vinci"><span title="Italian Renaissance polymath (1452−1519)">Leonardo da Vinci</span></a>
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<a href="//commons.wikimedia.org/wiki/File:Mona_Lisa,_by_Leonardo_da_Vinci,_from_C2RMF_retouched.jpg" title="File:Mona Lisa, by Leonardo da Vinci, from C2RMF retouched.jpg">File:Mona_Lisa,_by_Leonardo_da_Vinci,_from_C2RMF_retouched.jpg</a>