> Meanwhile, does the art restoration world place a premium on using dissimilar materials, that prevent further disintegration while fooling the eye, but are easily distinguished by future scanning techniques?
Yes - as I understand it, restoration involves careful use of solvents to remove old layers of varnish/added paint, followed by a new coat of varnish to protect the original underlying paint, followed by inpainting/overpainting (filling on cracks and/or painting over damage). This is done using materials that can be easily removed by future restorers without damaging the original. I imagine these layers would show up on a sufficiently high-res scan, too.
Yes - as I understand it, restoration involves careful use of solvents to remove old layers of varnish/added paint, followed by a new coat of varnish to protect the original underlying paint, followed by inpainting/overpainting (filling on cracks and/or painting over damage). This is done using materials that can be easily removed by future restorers without damaging the original. I imagine these layers would show up on a sufficiently high-res scan, too.