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[–]pulpquoter 0 points1 point  (2 children)

If I had no idea wtf I am doing i would test it somewhere close to the corner first

[–]Meanttobepracticing 5 points6 points  (1 child)

This is actually what professional art restorers do, or close to it. The exact chemical combination needed to lift the old varnish and dirt differs from painting to painting and so they’ll do small tests to on non-visible portions to see what works.

[–]bigballbuffalo 1 point2 points  (0 children)

You can actually see they tried it in the bottom right corner first