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The Restoration-Conservation
Modern restoration-conservation follows the rules of the « Venice Charta  ». There are three amendments that have always to be respected :

Stability
Reversability
Minimum Intervention

Stability:
Any product added to an artwork has to be selected for its highest possible stability. Even on long terms it must not degrade, discolor, or desintegrate by the simple fact of ageing.

Reversability:
Any product added to an artwork has to be able to be taken off at any time in the future without endangering it. For this reason a restorer always uses materials that can be taken off with means (for ex : solvants) that do not affect the original. For the same reason a painting is always varnished before retouching, in order to create a « barrier » between the original and the newly added paint. This way, when the varnish will be replaced in the future, all the retouchings will disappear at the same time without the original reacting to the solvant of the varnish.

Minimum Intervention:
On an artwork only the losses or deteriorated zones may be treated  Any original material must be respected and stay untouched . This way, for example, small losses have to be retouched, but the added paint must not overlay the original one. Any « improvements », modernizations etc . are strictly prohibited.