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Maybe you opened your parents' wedding album and everyone looked a little orange. Or the baby photo that sat on a windowsill for ten years is now mostly pale blue. If you're asking why do old photos fade, the short answer is chemistry, and most of it is chemistry you can slow down.

This guide explains what is happening inside the print in plain terms. Then it gives the three changes that do the most good, in order, plus the smaller fixes that are worth an afternoon.

Do photos fade over time, even in a drawer?

In short: yes. Every print changes with age. Light is one cause, but it is not the only one.

People who preserve photographs talk about two kinds of fading:

• Light fading happens to photos on display. The more light a print gets, and the longer it gets it, the more it fades.
• Dark fading happens to photos in albums, boxes and drawers. No light is involved. The dyes slowly break down on their own, and warmth and moisture set the pace.

That second one surprises people. A photo that has never left its album can still look washed out or strangely tinted forty years later. The album kept the light away. It did nothing about the temperature and humidity in the room where it sat.

So preventing photo fading is really two jobs: limit the light, and control the air.

What does light do to a photo?

A color print is built from three layers of dye: cyan, magenta and yellow. Your eye mixes them into every color in the picture. Each dye is a large, fairly fragile molecule.

When light hits a dye molecule, it delivers energy. Enough energy breaks the molecule's bonds, and a broken dye molecule no longer has color. Ultraviolet light carries the most energy, so it does the most harm per minute. Ordinary visible light does the same damage more slowly.

Three things are worth knowing about light damage:

• It adds up. A little light for a long time does as much harm as strong light for a short time. Ten years in a bright hallway counts.
• It doesn't reverse. Putting a faded print in the dark stops further light damage. It does not bring the color back.
• The dyes don't fade evenly. One dye usually gives out before the other two. That's why old photos shift color instead of simply getting lighter.

That last point explains the orange wedding album. In many color papers from the 1970s and 1980s, the cyan dye was the weakest one in dark storage. As the blue-green drops out, what's left reads red, orange or pink. Light fading often hits a different dye, so a framed print can shift a different way than its twin in the album.

What do heat and humidity do?

In short: heat speeds up every reaction in the print, and moisture feeds those reactions and adds problems of its own.

Heat

Dark fading is a chemical reaction, and chemical reactions run faster when they're warm. A rough rule of thumb in chemistry is that many reactions about double in speed for every 18°F (10°C) rise. A box of photos in a summer attic is aging far faster than the same box in a bedroom closet.

Heat also yellows the paper itself. That creamy or tan cast in the white borders of old color prints is staining in the paper and leftover processing chemistry, and warmth brings it on sooner.

Humidity

The picture in most prints sits in a thin layer of gelatin. Gelatin soaks up moisture from the air. Damp gelatin lets fading reactions move faster, and in very humid air it turns soft and sticky. That is how photos end up fused to the glass of a frame or to each other in a stack.

High humidity also brings mold, which feeds on gelatin and leaves spots that don't come out. Very dry air has the opposite problem: prints curl and turn brittle.

Swings

Big changes are hard on prints too. Paper and gelatin swell and shrink at different rates as the air shifts from damp to dry and back. Over years, that causes curling, cracking and flaking. A steady room is better than one that is perfect in May and terrible in August.

For home storage, the National Archives' guidance for family collections points to a simple target: room temperature or cooler, below about 75°F, with humidity kept under roughly 65% to prevent mold and not so dry that prints turn brittle. Most lived-in rooms meet that. Most attics, garages and basements don't.

Why do some old photos fade faster than others?

Different kinds of prints are made of different things, so they fail in different ways. Use this table to work out what you have and what it needs most.

Two rows need extra attention in a house with a new baby. Thermal prints are the least stable thing in the table, and that includes most ultrasound photos. Copy them early. Our guide to saving ultrasound photos and other pregnancy keepsakes covers how.

The other is the 1960s to 1980s color print. If your own baby photos are from those decades, they are likely the most at-risk originals your family owns, even if they have never seen daylight.

How to stop photos from fading: the three changes that matter most

Nothing stops fading completely. These three changes slow it more than anything else, and none of them needs special equipment.

1. Display copies, and keep the originals in the dark

This is the biggest single change for any photo on a wall or shelf. Have a copy made of the photo you love, frame the copy, and put the original in a box. If the copy fades in fifteen years, you print another one.

For the copies you display:

• Pick walls that never get direct sun. Stand in the room at mid-morning and late afternoon and see where the light lands.
• Avoid spots above radiators, heating vents and fireplaces, and skip bathrooms and kitchens.
• UV-filtering glass or acrylic helps. It slows fading but does not stop it, because visible light fades dyes too.
• In a nursery, hang frames well away from the crib, never above it, and anchor them securely to the wall.

The same logic applies to anything printed or inked that hangs on a wall. We wrote a separate guide on keeping a canvas growth chart from fading in sunlight, and the wall test in it works for framed photos too.

2. Move the box to the lived-in part of the house

Photos do best in the same conditions you do. If a space is too hot, too cold or too damp for you to sit in comfortably, it is wrong for prints.

Where you can, keep boxes off the floor in case of a leak, and always away from pipes and vents. If you only do one thing this month, carry the photo boxes down from the attic or up from the basement.

3. Scan the ones you can't replace

A scan doesn't slow fading, but it records the print as it looks today. Whatever happens to the paper after that, you keep the picture as it is now.

• Start with the fragile ones: thermal prints, instant prints, 1960s to 1980s color, and any photo that exists as a single copy.
• Use a flatbed scanner if you can. 600 dpi is a sensible setting for standard prints. Go higher for tiny prints you may want to enlarge.
• A phone works as a first pass. Shoot in bright, indirect light, straight on, with no glare on the surface. A quick phone copy today is better than a perfect scan you never get to.
• Back up the files. Keep three copies on two kinds of storage, with one outside your home, such as a cloud account or a drive at a relative's house.
• Name them. Put the year and the people in the file name while someone still remembers.

Scanning is also the natural moment to choose which prints go into a book. If that's your next project, here is how to make a memory book for each stage of childhood.

Smaller fixes: albums, sleeves, frames and handling

Once light and climate are handled, the next thing to look at is what the prints are touching. Some common materials give off acids or chemicals that stain and fade photos from the back.

What to move photos out of

• "Magnetic" albums with sticky pages and a clear plastic overlay. The adhesive yellows and grips harder with age. If a print won't lift easily, don't force it. Photograph or scan the whole page first, then try sliding unwaxed dental floss under a corner, and stop if it resists.
• Soft, strong-smelling vinyl sleeves. These are often PVC, which breaks down and can stick to prints.
• Shoeboxes, old envelopes and brown cardboard. Most are acidic.
• Rubber bands, paper clips, tape and glue. They stain, dent and leave residue.

What to move them into

• Boxes, envelopes and album pages labeled acid-free and lignin-free. A label saying the product passed the Photographic Activity Test (PAT) is the strongest sign it is safe for photos.
• Clear sleeves made of polyester, polypropylene or polyethylene.
• Photo corners in place of glue or tape in albums.

A photo-safe storage box is not a big purchase, and the Library of Congress guide to caring for photographs has more detail on materials if you want it.

Framing and handling

• Use a mat or spacer so the print never touches the glass. If a photo is already stuck to glass, leave it there. Scan or photograph it through the glass and ask a photo conservator before trying anything else.
• Hold prints by the edges with clean, dry hands. Skin oils and hand lotion leave marks that show up years later.
• Label the back along the edge with a soft pencil, not a ballpoint or marker. Glossy modern prints often won't take pencil, so write on the envelope or sleeve.
• Don't laminate. It uses heat and adhesive, and it can't be undone.

If the photos are meant to pass to your kids one day, the names and dates matter as much as the image. The labeling system in our guide to passing down family heirlooms without conflict works well for a photo box.

Can you fix a photo that has already faded?

You can't restore the paper print. Once dye molecules have broken down, no home treatment brings them back. Be wary of advice to wipe, wash or bleach a print. That usually makes things worse.

The picture can often be recovered digitally. A faded print still holds more information than your eye picks up, and a good scan captures it. From there:

• Basic photo software can correct a color cast and bring back contrast, sometimes in one click.
• A photo restoration service can handle heavier fading, stains, cracks and tears.
• The corrected file can be printed again on modern paper, which holds color much longer than the paper of fifty years ago.

Keep the faded original anyway, stored well. It is still the real object, with real handwriting on the back.

Where to start this weekend

You don't need to redo every album in the house. Work down this list in order and stop when you run out of time. The first few items do most of the good.

• ☐  Carry any photo boxes out of the attic, garage or basement to an interior closet shelf.
• ☐  Walk the house and note every original print that gets direct sun.
• ☐  Take phone photos of all ultrasound and other thermal prints today.
• ☐  Pull the ten photos you would be saddest to lose and scan them.
• ☐  Save those scans in three places, with one outside your home.
• ☐  Order copies of sunlit originals, then swap the copies into the frames.
• ☐  Move prints out of sticky-page albums and vinyl sleeves into photo-safe ones.
• ☐  Remove rubber bands, paper clips and tape wherever they come away easily.
• ☐  Pencil names and years on the backs, or on the envelopes.

Photos fade because of what they're made of, so some change is unavoidable. But the difference between a print in a hot attic and one in a dark closet, with a scan backed up in three places, is decades of extra life. Move the box first, and do the rest when you have time.

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