Stone and metal

Stone and metal materials, when used in library collections, require specific preservation and conservation methods to ensure their longevity. Stone artifacts, including inscriptions, monuments, and architectural elements, are vulnerable to environmental factors such as moisture, temperature fluctuations, and pollutants. Preservation techniques for stone include controlling humidity ____ __________ ______ __________ _______ ____ ________ _________ ______ ___ ______ ______.
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