Also at many places the cracks seems to be overpainted, filled in. I guess that's from the restorations... I just looked it up and there is a picture from an a

Also at many places the cracks seems to be overpainted, filled in. I guess that's from the restorations... I just looked it up and there is a picture from an analysis where they are showing its possible state before the restoration: https://media.springernature.com/lw685/springer-static/image/art%3A10.1186%2Fs40494-019-0307-5/MediaObjects/40494_2019_307_Fig6_HTML.jpg?as=webp https://media.springernature.com/lw685/springer-static/image... "In UV fluorescence, the natural resin varnish layer fluoresces greenish, and areas retouched in 1994 can be distinguished from the original paint as they appear darker" The full paper: https://www.nature.com/articles/s40494-019-0307-5 https://www.nature.com/articles/s40494-019-0307-5