I find these scientific examinations of artworks very interesting, both from the historical/technical side and the esthetic side. One of my favorite YT available TV series is "Fake or Fortune" from the UK, where they do such examinations including provenance, etc. Both entertaining and informative, and I wish they had new series available in the US. "Starving artists" reuse canvases, but so the the thriving artists, as they work out their ideas or reject some. Anything new that is authentically Van Gogh is informative. The guy isn't painting anything new lately! LOL All my stuff from the past decade or so is documented via one blog form or another, so when I'm gone and famous, you'll be able to research it easily without involving the Courtald Institute.... ;=)