Most postcard damage does not happen in a single dramatic moment. It accumulates: a card that spent two summers pinned near a window, a bundle held together by a rubber band for fifteen years, a shoebox in a basement where the paper slowly developed a rash of brown spots. Postcards are sturdy little objects, and they forgive a lot. But the things that ruin them — light, moisture, acid, pressure — work quietly and steadily. The supplies below are neither exotic nor expensive, and the habits matter more than any single purchase.
What Actually Damages a Postcard
Before buying anything, it helps to know what you are defending against. Four forces do almost all the harm.
Light fades inks and yellows paper. Ultraviolet radiation breaks the chemical bonds in dyes, and the damage is cumulative and permanent. A postcard that looks fine after a month on a sunny wall may look noticeably washed out after three years.
Moisture does two things. It softens and warps paper, and it feeds the chemical reactions that produce foxing — those small rust-colored speckles that spread across old card stock. Foxing is not simply dirt, and it does not brush off. Once it takes hold, it is difficult to reverse without a conservator.
Acid migrates. Cheap envelopes, cardboard shoeboxes, wooden drawers and old magnetic albums all off-gas or transfer acidic compounds into paper, which turns it brittle and brown at the edges. Contact matters: a card pressed against acidic board will yellow where it touches first.
Pressure creases. Stacked books, tight elastic bands, overstuffed albums and careless handling in and out of sleeves all leave bends that no amount of later flattening will fully remove.
Sleeves: Your First Line of Defense
Every postcard should live in its own sleeve. Not because sleeves look tidy, but because they let you handle a card without touching it, and they keep neighboring cards from rubbing, sticking or transferring acid to one another.
Buy plastic that is chemically inert. In practice, that means polyester (often sold as Mylar or Melinex), polypropylene, or polyethylene. Polyester is the clearest and most rigid, and it is the safest choice for anything valuable. Polypropylene is a reasonable, less costly option for a large working collection. Avoid PVC entirely: it contains plasticizers that migrate into paper, cause cards to stick to the plastic, and eventually turn yellow and brittle themselves.
Be aware that "archival" is a marketing word, not a regulated standard. Look for a stated material and, where offered, a note that the product has passed a photo activity test. If a supplier cannot tell you what the plastic is made of, keep looking.
Sizing and practicalities
- Standard vintage postcards are roughly 3.5 by 5.5 inches; continental cards are closer to 4 by 6. Buy sleeves a quarter inch larger in both directions so the card slides in without scraping a corner.
- Choose a thickness of about 2 to 4 mil. Thin sleeves are cheaper but wrinkle; heavier ones hold shape and survive repeated handling.
- Sleeves open on two or three sides let air move and prevent trapped moisture. For long-term storage in a dry room, either style is fine.
- Write inventory notes on the sleeve with a pencil or an archival-safe marker, never on the postcard itself.
And keep the card out of sticky albums, lamination pouches, glue, tape and photo corners with self-adhesive backing. All of them fail eventually, and they fail on the card.
Boxes, Albums and the Question of Pressure
A sleeve protects a card from handling; a box protects it from the room. Choose boxes made of lignin-free, acid-free board with a alkaline reserve, and prefer ones with reinforced metal corners if you plan to stack them.
Store postcards either flat or vertically, like files in a drawer — what you want to avoid is a stack tall enough to press down on the cards at the bottom. If you store upright, the box needs to be full enough that the cards do not slump and bend, but not so full that you have to force them in. Acid-free folders or dividers solve both problems at once.
Albums work well for a display collection: choose pages of archival polyester or polypropylene in a binder that closes, and never overfill a page or a spine. An album that bulges is an album that is creasing its contents.
Skip the shoebox, skip the attic trunk
Cardboard boxes, wooden chests, cedar drawers and plastic storage tubs are all more permeable or more chemically active than an archival box. Wood and cardboard are the worst offenders. If you must use a tub temporarily, put cards in sleeves and acid-free folders first, and keep the tub out of heat and damp.
Humidity, Heat and Light
Paper likes stability more than it likes any particular number. Aim for a room that stays roughly between 30 and 50 percent relative humidity and does not swing wildly with the weather. Basements flood and stay damp. Attics bake in summer. Garages and sheds do both. Exterior walls, kitchens, bathrooms and the space above a radiator are all poor choices for the same reasons.
A cheap hygrometer will tell you what you are dealing with. If your only storage space is humid, you can still create a decent microclimate: seal the cards inside a well-fitted archival box or a polyethylene bin with a small packet of silica gel, and refresh the gel periodically. Keep the box off the floor and away from the wall.
For light, the rule is simple: display less, and display behind glass that filters ultraviolet. Rotate what is on the wall, keep cards off sun-facing shelves, and use curtains or blinds in the room where the collection lives. Light damage cannot be undone.
Handling Habits That Prevent Most Damage
- Work clean and dry. Wash and dry your hands before a sorting session; skip lotion. Cotton gloves are worth wearing for anything valuable, though they reduce grip, so slow down and support each card with your second hand.
- Clear a surface. Use a clean, flat table covered with a sheet of acid-free paper. No coffee cups within reach.
- Lift by the edges. Never slide a card across a table or pry it up by a corner. If a card is stuck to something, do not force it; get advice before you pull.
- Sleeve before you sort. Handle cards in their sleeves while you arrange them, so the paper is touched once.
- Keep a written record. Note what you know — date, publisher, message, condition — on the sleeve or in a simple list. Photograph the fronts and backs as insurance, especially before lending anything out.
Two small habits also help: check incoming cards for insects or mold before they join the collection, and never store a card in an envelope you have not verified as acid-free.
The Archival Supplies Checklist
- Polyester or polypropylene sleeves in two or three sizes
- Acid-free, lignin-free storage box with a lid, sized to your collection
- Acid-free folders or dividers
- Acid-free tissue or interleaving paper
- A pencil for marking sleeves
- A hygrometer for the storage room
- Silica gel packets, if the space runs damp
- Cotton gloves for handling
- A clean, flat work surface and a sheet of acid-free paper
Begin With One Box
You do not need to rehouse everything this weekend. Start with the postcards that would hurt most to lose: the oldest, the signed ones, the ones with family handwriting on the back. Sleeve them, box them, move them out of the light and off the damp shelf, and write down what you know about them. The rest of the collection can follow in batches. Ten years from now, the difference between the cards you protected and the ones you left in a shoebox will be obvious at a glance — and it will be entirely down to these small, unglamorous decisions.
Photo: BRRT / Pixabay
