Restoring the Salvator Mundi
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https://www.youtube.com/channel/UCvZe6ZCbF9xgbbbdkiodPKQ
It's extremely relaxing to watch. I guess I chose to wrong profession.
If you understand German, there was also a good 45 min documentary about a restaurator a few weeks ago on SWR:
https://www.youtube.com/watch?v=6-hbYKyyWiI
His gilding skills are superior to Baumgartners.
Apparently Baumgartner and his techniques are under some criticism from other restorers, but all I could find was a somewhat angry Reddit thread.
Edit: It is, indeed: https://news.artnet.com/art-world/michael-lewis-salvator-mun...