Preserving fragile photographs for future generations

Why our oldest photographs need gentle handling

If you have inherited a shoebox of photographs, you are holding something remarkable. Many of the images in that box were made using processes that were never designed to last a century — albumen prints, glass negatives, early colour dyes, and thin photographic papers that have already begun to curl, fade or flake. The good news is that most of the damage that threatens them happens slowly, and much of it can be prevented with a few inexpensive, straightforward changes to how they are stored and handled.

The guiding principle is simple: reduce the things that damage photographs, which are light, heat, moisture, acids, adhesives and oily fingers. Get those under control and your family's pictures may well survive for another hundred years.

Start with clean, dry hands

Before you touch a single print, wash your hands with mild soap and dry them thoroughly. Clean, dry hands are usually the safest way to handle photographic prints, because gloves can catch on a torn edge or a lifting emulsion and cause a rip. If you are handling negatives, slides or glass plates, thin nitrile gloves are worth wearing, as skin oils are especially damaging to those surfaces.

Handle prints by their edges, supporting the whole sheet flat with both hands rather than pinching a corner. Work on a clean, uncluttered table with plenty of space, and never hold a photograph over a hard floor. If you are sorting a large collection, do it in short sessions so you stay attentive — most accidents happen when we are tired and rushing.

Invest in acid-free sleeves and boxes

Ordinary paper, card and plastic are the enemies hiding in plain sight. Wood-pulp paper is acidic, and cheap PVC sleeves slowly release gases that attack photographic images. Replace them with materials sold as archival quality.

• Sleeves: choose sleeves made from polyester, polyethylene or polypropylene. These are inert, see-through, and safe to view through without removing the print.
• Paper enclosures: use acid-free paper or board. Unbuffered paper is generally the safer choice for colour and dye-based prints, while buffered paper suits many black-and-white prints and ordinary documents.
• Boxes: store sleeved photographs upright in acid-free boxes, like books on a shelf. Stacking them flat presses the images together and encourages scratches.
• Label in pencil: jot names, dates and places on the enclosure, never on the photograph itself. Use a soft pencil on the sleeve or an acid-free label on the back of the box.

Remove anything that clips, glues or sticks: rubber bands, paper clips, adhesive tape, sticky album corners and the notorious self-adhesive "magnetic" albums. If a photograph is already stuck in an old album, seek advice from a conservator rather than prising it free.

Keep light, heat and damp at bay

Light is the great fader. Ultraviolet radiation bleaches dyes and yellows paper, and even ordinary household light does damage over decades. Keep your photographs away from direct sunlight and from bright spots such as windowsills and conservatories. If you want to display a treasured image, have a high-quality copy made and frame that instead, keeping the original safely in the dark.

Aim for a stable, comfortable environment: roughly 18 to 20°C with relative humidity between 30 and 50 per cent, and never above 60 per cent, which is when mould begins to thrive. Keep humidity above 30 per cent too, as very dry air makes prints brittle and can crack emulsion. Lofts, garages, cellars and airing cupboards are the worst places in a British home — they swing between extremes. The middle of a house, in a cupboard in a spare bedroom, is usually ideal. Store boxes off the floor and away from outside walls, and keep them clear of radiators, pipes and chimneys.

Make digital copies as a safety net

Nothing replaces the original, but a good digital copy means the story survives even if the print does not. Scan at 600 dots per inch for standard prints, and higher for small or detailed images. Save files as uncompressed TIFFs for archiving, and keep a set of smaller JPEGs for sharing with the family.

Then follow the rule of three: keep one copy on your computer, one on an external drive stored elsewhere, and one in a reputable cloud backup. Label files with names, dates and places while the knowledge is fresh, and write the same details on the sleeves. Digital files are only as good as their documentation.

Share the care — and the stories

Preservation is really about continuity. Sit down with older relatives and record who is in each picture, where it was taken and what was happening that day. Ask about the photographs nobody can identify; sometimes a face or a uniform jogs a memory that would otherwise be lost.

Finally, pass on the habits as well as the collection. Show the next generation how to hold a print, why the sleeve matters and where the archive lives. A neatly stored box, labelled in pencil and kept in a cool, dark cupboard, is a quiet gift to people who have not been born yet — and it costs very little to give.