Preservation can be performed in such a way that neither perceivable nor unperceivable features of the object are altered in any way. This kind of preservation is often called 'preventive conservation'. […] Other forms of preservation imply a change in the object, while 'preventive' preservation implies a change in the object's environment. [...] Preventive preservation uses techniques that concentrate on the surroundings of the object itself, while direct preservation acts by changing some features of the object itself, usually restoring some of its less perceivable features (internal coherence, pH, tensile strength, etc.). Preventive conservation could thus be appropriately called 'environmental preservation'. (In Contemporary Conservation Munoz Vinas uses the term 'environmental' preservation to describe this activity.)
Munoz Vinas, 2005, p. 21 - 23
Conservation aimed at preventing future deterioration of materials or artifacts, including providing suitable environmental conditions.
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