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Store Family Letters and Paper Documents: Six Archival Care Steps

Based on Library of Congress advice, learn to store letters and family papers flat, protect them with acid- and lignin-free folders, and choose a cool, stable, relatively dry location.

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Wikimedia Commons · Photo: Smallison / Wikimedia Commons, CC BY-SA 4.0; original image, no modifications. https://commons.wikimedia.org/wiki/File:Boxes_of_archival_documents.jpg · Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) ↗

Old letters deserve more than an arbitrary cardboard box. The U.S. Library of Congress recommends a cool, stable setting with roughly 35–50% relative humidity, minimal light exposure, supportive archival enclosures and flat storage. These are preventive steps for ordinary paper, not instructions to restore moldy or fragile originals.

Your try-it-at-home checklist

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1. Sort letters and papers and check their condition. Do not forcibly flatten brittle sheets or rub flaking ink or powdery media. Isolate material affected by mold or water and consult a conservator.
2. Store documents flat with proper support where possible. Avoid forcing stubborn folds backward; place fragile sheets in protective folders so they do not carry the weight of other objects.
3. Choose archival folders and document boxes labeled acid- and lignin-free rather than ordinary cardboard or newspaper. Some inks and pigments may react poorly to alkaline-buffered materials; seek specialist advice for unusual items.
4. Use a cool, clean place with stable temperature and humidity. The Library of Congress gives roughly 35–50% relative humidity as a useful general range. Avoid damp basements, leak-prone spaces and hot attics.
5. Keep originals out of direct sunlight and strong lighting, and away from radiators and vents. Display copies rather than irreplaceable originals to reduce light exposure and handling.
6. Label the outside of boxes with contents and dates to minimize unnecessary handling. Check periodically for leaks, pests or mold. A digital access copy is convenient, but the original still needs proper storage.

U.S. Library of CongressHow do I preserve my letters or paper documents? ↗Library preservation FAQ updated August 4, 2026, on cool stable conditions, 35–50% relative humidity, light avoidance, acid-free folders, flat storage and sensitivity of some media to alkaline material.U.S. Library of CongressCare, Handling and Storage of Works on Paper ↗Supplementary official guidance to distinguish ordinary preventive handling and storage from invasive treatment.Wikimedia CommonsFile:Boxes of archival documents.jpg ↗Original photo's creator Smallison, location York University Libraries, original file and CC BY-SA 4.0 license checked independently.Wikimedia CommonsCommons Reusing Content Outside Wikimedia: Technical ↗Confirmed Wikimedia source-level direct hotlink allowance with requirement to honor file-level author attribution and license.

Your try-it-at-home checklist

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