Why Wartime Letters and Diaries Deserve Careful Preservation

During the Second World War, British leadership depended on written communication. Handwritten orders, letters from the front, diaries kept by civilians, and photographs of home front efforts now form a vital part of our family history. A letter from a young subaltern at Dunkirk, a diary kept by a land girl, or a snapshot of a Home Guard parade—these fragments are irreplaceable. Yet paper from the 1940s is often acidic, photographs fade, and ink can flake. Without care, they crumble into dust.

The enemies of historical documents are predictable: light, heat, humidity, pests, and clumsy handling. Ultraviolet light breaks down fibres. Damp encourages mould. Fluctuating temperatures cause paper to swell and contract. Even the oils from your fingers can etch permanent marks. The good news is that simple, affordable steps can halt most damage.

Choosing Acid-Free Folders and Boxes

The first line of defence is good storage. Ordinary cardboard and envelopes contain acids that migrate into paper, causing yellowing and brittleness. Instead, use acid-free, lignin-free folders and document boxes. For photographs, choose acid-free sleeves or envelopes made from polyester, polyethylene, or polypropylene. Avoid PVC—it off-gasses harmful chemicals.

• Acid-free document boxes for letters, diaries, and loose papers.
• Acid-free tissue paper to interleave folded documents or support torn edges.
• Unbuffered folders for photographic prints, as buffered materials can harm some image types.
• Buffered folders for newspaper clippings and acidic paper, which need alkaline protection.

Never use sellotape, glue, or laminate. These cause irreversible damage. Remove paper clips, staples, and rubber bands—they rust, crease, and perish. If a document is folded, leave it folded but interleave with acid-free tissue, and store it flat in a box. Do not force it open.

Creating a Cool, Dark, and Stable Storage Space

Aim for a consistent temperature of 16–18°C and relative humidity of 45–55%. Stability matters more than exact numbers; repeated swings are worse than a steady 20°C. Avoid attics, basements, garages, and sheds, which suffer extremes and damp. A cupboard in a living area, away from radiators, windows, and damp walls, is ideal.

• Keep boxes off the floor and away from exterior walls.
• Store in darkness—light fades ink and photographs.
• Use opaque boxes or cover shelves with a cloth.
• Monitor with a simple hygrometer and adjust if you see condensation or mould.

If you live in a flood-prone area, raise boxes onto shelves. For very precious items, consider a small fireproof safe, but ensure it does not trap moisture. Silica gel can help in enclosed spaces, but change it regularly.

Gentle Handling Techniques for Fragile Paper and Photographs

Wash and dry your hands before touching paper. For photographs, wear nitrile or clean cotton gloves. Support documents with a stiff acid-free board underneath. Hold by the edges, never by the image or text. Do not fold, press, or write on the front. Label the back of photographs with a soft pencil—never ink—along the edge.

• Remove metal fasteners with a flat spatula, sliding it under the prongs.
• For torn documents, place them in an acid-free polyester sleeve; do not attempt repairs with tape.
• For rolled items, store them rolled in an acid-free tube, or consult a conservator about humidifying and flattening.
• Keep food and drink away. A single spill can destroy a wartime diary.

If a document is extremely brittle, handle it as little as possible. Make a digital photograph for daily reference, and keep the original in its protective folder.

Labelling, Organising, and Documenting Your Archive

A well-organised archive is easier to protect and share. Use pencil on folder tabs, not on the documents themselves. Create a simple inventory: date, author, description, and condition. Separate different media—photographs, letters, and diaries each have different needs. Store oversized items flat in a map chest or large box.

For British leadership and wartime history, context is everything. Note who wrote the letter, where they served, and what event it describes. A factory manager’s correspondence about wartime production, or an ARP warden’s diary, becomes far more meaningful when labelled clearly. Document what you know on a separate sheet, and keep that with the folder. Digital copies can be stored on a computer or cloud service, but the originals remain the priority.

When to Call in a Conservator

Some problems need professional help. Watch for mould (fuzzy patches), active insect damage (holes or frass), brittle paper that snaps, or flaking ink. Do not attempt repairs with domestic tape, glue, or heat. A trained conservator can stabilise fragile items and advise on storage. For large collections or documents of national significance, an initial consultation is worthwhile.

For most home archives, however, the steps above—acid-free folders, cool stable storage, and gentle handling—will preserve your family’s wartime letters, diaries, and photographs for generations. Your care ensures that future readers can still learn from British leadership, sacrifice, and everyday courage.