Among the most intimate records a family can possess are the letters its members wrote to each other. Love letters between grandparents. Postcards sent from war. Notes passed between siblings at school. Letters from a great-aunt describing a new country to the family she left behind. These documents capture not only information but voices — the rhythm of a person’s speech, the particular way they chose their words, the things they thought mattered enough to write down.
Unlike photographs, which show how people looked, letters reveal how people thought and felt. That is why they deserve special care. This guide explains how to safely preserve old love letters and family correspondence so they survive for future generations.
Why Family Letters Are So Fragile
Paper from the 19th and early 20th centuries is particularly vulnerable. Much of it was made using an acidic wood pulp process that causes paper to yellow, become brittle, and eventually disintegrate — a process archivists call “slow fire.” Ink can fade or oxidise. Folds and creases weaken over time, and old paper cracks when unfolded after years of storage.
Environmental threats compound the problem:
- Humidity causes paper to expand, buckle, and develop mould
- Heat accelerates chemical breakdown and dries out paper
- Light — particularly ultraviolet light — fades ink and yellows paper rapidly
- Pests such as silverfish and rodents eat paper and glue
- Rubber bands and staples corrode and stain paper over time
The first step in preservation is understanding these threats and removing any existing sources of damage.
Sorting and Assessing What You Have
Before handling old letters, wash your hands thoroughly. The oils and salts from skin accelerate paper degradation. For very fragile or valuable letters, consider wearing clean cotton gloves.
Lay out what you have and make a preliminary survey:
- How many letters or cards are there?
- What approximate date range do they span?
- Who wrote them, and to whom?
- What condition are they in? Note any that are especially fragile, torn, stained, or stuck together.
Do not force open stuck letters or envelopes. If pages are stuck together, a conservator can often separate them without damage — attempting it yourself risks tearing.
Remove any rubber bands immediately — these degrade and leave staining marks on paper. Remove any metal clips or staples using a microspatula or blunt tool, working slowly and carefully. These metals corrode and cause rust stains.
Cleaning and Flattening
Surface dirt can be gently removed from stable (not fragile or flaking) paper using a dry soft brush or a white vinyl eraser applied very lightly. Never use water or liquid cleaners on old paper unless you have been trained in paper conservation.
Folded letters that have been stored flat for decades may crack when unfolded. If a letter needs to be opened, place it in a slightly humid environment first — such as a closed container with a damp (not wet) sponge nearby — for 30 minutes to allow the paper fibres to relax. Then unfold very slowly, supporting the paper fully. Place the unfolded letter under a clean, heavy book for several hours to flatten it gently.
Severely damaged or fragile letters are best left as found and digitised in their current state rather than risking further damage by handling.
Proper Storage Materials and Conditions
The right storage materials are the most important investment you can make in long-term preservation.
Acid-Free Enclosures
Store each letter in an individual acid-free, lignin-free paper or polyester sleeve. Polyester (Mylar) sleeves are excellent for fragile letters because the transparent material means you can read the letter without removing it and handling it repeatedly. Acid-free paper envelopes work well for letters in good condition.
Never store letters in regular plastic bags. Many plastics off-gas chemicals that damage paper over time, and they trap moisture.
Archival Boxes
Store the sleeved letters upright (like filing cards) or flat in an acid-free archival box. Do not overfill the box — letters should sit without being compressed. If you have both letters and their envelopes, store them together in the same sleeve.
Ideal Storage Conditions
The ideal storage environment for paper documents is:
- Temperature: around 18°C (65°F) or cooler, with minimal variation
- Relative humidity: 30–50%, stable rather than fluctuating
- Away from direct light, especially sunlight and fluorescent lights
- Away from exterior walls, which can be damp
- Not in an attic (too hot in summer), basement (too damp), or garage (extremes of temperature and humidity)
An interior closet in a climate-controlled room is typically the best home storage option for most families.
Digitising Family Letters
Even with the best physical preservation, digitising your family letters is essential. A digital copy protects against fire, flood, and deterioration, and makes the letters accessible to family members who cannot handle the originals.
Scanning
A flatbed scanner produces the best quality. Use a resolution of at least 400 DPI (dots per inch) for text documents; 600 DPI for letters with handwriting or fine detail you want to study closely. Scan both recto (front) and verso (back) of each page. Save files as TIFF for archival quality, alongside a JPEG copy for sharing.
Photography
If a letter is too fragile or bulky to scan flat, photograph it. Place it on a plain white acid-free surface in even, indirect natural light (avoid direct sunlight or flash, which create glare and shadows). Photograph each page individually. Use a steady hand or a tripod for sharp results.
Transcribing the Text
A digital scan captures the visual document but not the searchable text. Consider transcribing the text of important letters — either by hand into a document or by running the scan through optical character recognition (OCR) software. Even a rough transcription makes the content searchable and accessible to family members who find old handwriting difficult to read.
Organising and Cataloguing Your Collection
A well-organised collection is far more useful than a beautiful box of unsorted papers.
- Number each physical letter and its digital scan with a matching reference code (e.g. CORR-001, CORR-002).
- Create a simple spreadsheet or document logging each letter: date, writer, recipient, subject, condition, and reference code.
- Group letters by correspondence relationship (e.g. all letters between your grandparents in one folder, all wartime letters in another).
- Store the digital files in a folder structure that mirrors the physical organisation.
Sharing and Transcribing for the Family
Once your letters are preserved and digitised, consider how to make them accessible to the wider family. Options include:
- Printing a selection of key letters in a family history book, with transcriptions alongside scans of the originals
- Creating a shared cloud folder (Google Drive, Dropbox, iCloud) where family members can browse scans
- Reading selected letters aloud at a family gathering and recording the reading
- Including selected letters in a memory box alongside photographs and other keepsakes
Letters often reveal the most surprising and moving aspects of ancestors’ lives — the fears, the humour, the longing, the mundane details of daily life. Sharing them with the broader family gives others the chance to know people they may never have met.
Conclusion
Old love letters and family correspondence are primary historical documents. They are also irreplaceable human connections across time. With a little care and the right materials, you can ensure that the letters your grandparents exchanged, or the postcards your great-uncle sent from across the world, survive to be read by people not yet born. The work is not difficult — it is simply a matter of deciding that these voices deserve to be heard.
Frequently Asked Questions
How do I store letters that are stuck together?
Do not force them apart. Place them in a humidity-controlled environment (a sealed box with a slightly damp sponge for 30–60 minutes) to relax the fibres, then try to separate them gently with a bone folder or blunt microspatula. If they remain stuck, consult a paper conservator rather than risking damage.
Can I laminate old letters to protect them?
No. Lamination is irreversible and traps acids in the paper, accelerating deterioration. It also makes professional conservation impossible if the paper degrades further. Use archival sleeves instead.
What is the difference between acid-free and archival quality?
Acid-free means the material has a neutral or slightly alkaline pH that will not damage paper through acid transfer. Archival quality typically means the material also meets additional standards for long-term stability, including being free from lignin (a wood pulp compound that yellows over time). For letter storage, look for both acid-free and lignin-free materials.
Should I transcribe letters that are written in another language?
Yes, if possible. Even a rough translation is valuable for family members who do not speak the language. Consider asking a bilingual family member or using translation software as a starting point, then reviewing the result for context and accuracy.
How should I handle letters that contain private or sensitive information?
Preserve them as they are — the historical record is more valuable intact. You can note in your catalogue that a letter contains sensitive content and decide as a family whether to restrict access to it, make it available only to certain family members, or release it only after a certain number of years have passed.