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Polyethylene plastic and acid-free cardboard boxes are fine for storage. So is acid-free tissue paper or pre-washed unbleached cotton muslin when used as a box liner, packing material or dust cover. At all costs, avoid regular paper, cardboard, wood and wood products and adhesives such as urea-formaldehyde, which emit damaging acids. Also, do not use plastic garment bags (such as the ones provided by dry cleaners) because there is no air circulation (which can encourage moisture to build up); they offer no protection from light; and they are typically made of a non-recommended plastic.
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