Ok, you have two kind of restorations.
Restoration
1/ Professional for Museums, the changes should be seen and reversible.
2/ For collectors (done by professional or not) shouldn't be seen, but should respect the old techniques and materials (it is where you stand Alex).
3/ Conservation for Museums and collectors, just a cleaning and stabilizing of the objects with no added parts or modifications.
I hope that I'm more clear now...
Best,
Kubur
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