How to store banknotes without damage: avoiding folds, stains and fading

A banknote looks tough. After all, it was made to pass through thousands of hands. But for a collector, every detail counts. One fold, a crease in a corner or a greasy mark from your fingers can drop a note a whole grade. If you bought it as UNC (uncirculated), that costs you real money straight away.

The good news: with a few simple habits and the right materials, you can keep your notes in the same condition for years.

Handling: clean, dry hands and always by the edges

Most damage happens while you are handling a note. Your skin produces oils and moisture, and paper soaks them up. Often you only notice months later, as a stain or a discoloured edge.

• Wash and dry your hands before you touch your notes. Skip the hand cream or lotion.
• Hold a note by two opposite edges and keep it flat. Don’t pinch it in the middle.
• Work over a clean, flat surface, such as a felt mat or a clean sheet of paper. If the note slips, it has a soft landing.
• Gloves are not essential. Clean, dry hands are usually fine, and with gloves you have less feel and are more likely to fumble. For expensive or rare notes, many collectors opt for thin nitrile gloves.
• Tongs with broad, flat tips (stamp tongs) are handy for taking a note out of its sleeve. Never use tweezers with sharp or serrated tips.

What you should never do

Some habits seem harmless but cause permanent damage:

• Folding or rolling. Even a fold you “smooth out” again stays visible in the paper.
• Paper clips, staples, rubber bands and pins. They leave dents, rust or discolouration.
• Sticky tape or glue, not even to mend a small tear. The adhesive soaks into the paper and discolours it.
• Ironing, pressing, washing or “cleaning”. Experts can often spot a treated note, and they value it lower than an honestly circulated one.
• Laminating. There is no way back.
• Counting or “flicking” notes the way a cashier does. That is exactly how those small corner creases appear, and you can’t get rid of them.

The right sleeves: polyester yes, soft PVC no

Every note deserves its own sleeve. But not every plastic is suitable.

Safe sleeves are made of polyester (often sold as Mylar or Melinex), polypropylene or polyethylene. These materials don’t release anything into the paper.

Avoid soft PVC. It contains plasticisers that leach out of the plastic over time. They can leave a sticky film on the note and attack the ink. The treacherous part is that you won’t see it at first. A simple test: PVC feels limp and slightly greasy, whereas polyester is stiffer and crinkles when you bend it. If you have doubts about old sleeves or an album from the loft, replace them.

There are also sleeves made of rigid PVC without plasticisers, made especially for collectors. That is different from soft PVC: there is no plasticiser in it that can leach out. One example is the Banknote sheets Basic from Leuchtturm, which come in several sizes. The 140 × 80 mm size fits 0 euro souvenir notes exactly.

Paper envelopes and glassine are only suitable if they are acid-free and lignin-free, and even then mainly for short-term storage.

Polyester is stiff and smooth and keeps the note flat. Use sleeves that are just slightly larger than the note, so you can slide it in and out without forcing it.

Tip: Store a photo of the front and back of every note in AgAurium. If you later spot a fold or stain, you will know exactly whether it was already there. Try AgAurium for free →

Albums and boxes

Once the note is in its sleeve, it goes into an album or box.

• Choose albums with acid-free pages and pockets made of polyester or polypropylene.
• Avoid self-adhesive or “magnetic” album pages. Over the years, the adhesive can migrate into the paper.
• Store notes flat, or upright with enough support so they don’t bend.
• Stand the album upright in a cupboard rather than under a pile of books. Pressure leaves impressions and can dent the edges.

Graded notes in a sealed holder (a slab from, for example, PMG or PCGS) are best left in that holder.

Light, heat and humidity

Paper and ink have three enemies: light, moisture and large fluctuations.

• Light, especially sunlight and UV, fades colours and makes paper brittle. Keep your notes in the dark. If you want to display them, use UV-filtering glass or acrylic and rotate what you show.
• Moisture brings a risk of mould, small brown spots (foxing) and cockled paper. Too dry, on the other hand, makes paper brittle.
• Stable matters more than perfect. Cool, moderately dry, dark and without big swings works better than chasing an exact number. A sachet of silica gel in a closed box helps keep the humidity steady. Replace or dry it out now and then.
• The loft, cellar and garage are not good places. That is where temperature and humidity fluctuate most. A cupboard in a living room or bedroom is better.

You can read more about choosing the right spot in The best place to store your collection.

Polymer banknotes

More and more countries issue notes made of plastic (polymer). They stand up better to moisture and tearing, but not to heat: they can shrink or warp. So never leave them in the sun or near a radiator. Creases and folds stay visible in polymer too, so the same handling rules apply.

How AgAurium keeps track of your notes

Storing your notes well is one thing; knowing what you have is another. In AgAurium you record what matters for each note: country, year, face value, serial number, condition and a photo of the front and back. For banknotes, AgAurium can read the text on a photo and fill in fields such as the serial number and year for you.

You can see the condition of every note at a glance. If you later wonder whether a fold has appeared, simply compare the note with the photo. For each note you can also record where it is kept (for example “album 2, page 14”) and store the proof of purchase. That information is visible only to you.

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