If someone is so skillful that they can restore the painting to its original state, then I think they would be skillful enough to make a perfect copy, so there’

If someone is so skillful that they can restore the painting to its original state, then I think they would be skillful enough to make a perfect copy, so there’s no need to tamper with the original work. Their expert copy of the work would be valuable and educational in itself, and avoid damaging the original