In many places on the edges of the cracks in the dark background you can see tinges of blue or pink color. Is that from the lighting, or is the color actually there, if it is there, anyone have an idea why?
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...
"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