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Stain removal from library materials is an important aspect of preservation and conservation to maintain the aesthetic and informational integrity of documents. Various types of stains such as ink, rust, foxing, oil, and biological stains can affect paper, bindings, and other library resources. The use of chemicals for stain removal must be done cautiously to avoid damaging the material or ________ _______ _____ ______ ______ _____ _________ __________.
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