How to Store Stamps to Prevent Damage

A stamp that survives 150 years in a letter file can be destroyed in a decade by poor storage. Humidity warps paper and feeds mould, light bleaches colour, acid slowly disintegrates fibres, and careless handling tears perforations. The good news is that proper storage costs very little and requires no special expertise — just the right materials and a sensible environment.

The Enemies of Paper

Humidity. The ideal relative humidity for stamp storage is 45–55%. Below 40%, paper becomes brittle and gum can crack or curl. Above 60%, mould grows on both paper and gum, cancels become smeared, and stamps can stick to album pages or mounts. Humidity fluctuations are often more damaging than a consistently high or low level, because repeated expansion and contraction of paper fibres eventually causes weakness.

Light. Ultraviolet light fades ink. Stamps left in direct sunlight or near fluorescent tubes can lose colour within months. Even indirect daylight causes slow fading of aniline inks, which were widely used on 19th and early 20th century stamps.

Heat. High temperatures accelerate every chemical process — gum yellows, inks oxidise, and the acids naturally present in paper speed their work. A cool room is always better than a warm one.

Acid. Ordinary cardboard, many plastics, and poor-quality paper are acidic. In contact with stamps over years, acid migrates into the stamp paper and causes toning — the brown or yellow discolouration seen on old stamps that have been stored in cardboard boxes. Always use acid-free, archival-quality materials.

Albums vs. Stockbooks

Stockbooks are the workhorse of stamp storage. They consist of leaves with horizontal strips of clear acetate or glassine into which stamps slide easily. Stamps are not attached — they can be removed and rearranged freely. Stockbooks with black pages are preferable: black backgrounds make both the stamps and any watermarks easier to examine. Use stockbooks for:

• Incoming stamps awaiting sorting
• Duplicates and trading material
• A working collection not yet committed to a permanent album
• Thematic material being assembled

Albums are the permanent home. Printed albums (Stanley Gibbons Simplified, Scott National, Michel) provide illustrated spaces for every stamp of a given country and period, making gaps immediately visible. Blank-leaved albums suit collectors who want to arrange freely. Either way, stamps must be attached with hinges or mounts — they cannot just be laid loose.

Hinges vs. Mounts

This is the most consequential decision in stamp storage.

A stamp hinge is a small folded piece of glassine, gummed on one side. Moistening it and folding it over the top of a stamp, then pressing it to the album page, holds the stamp in place. Hinges are inexpensive and have been used for over a century. The problem: hinging a mint never-hinged stamp immediately reduces its value — sometimes by 50% or more — because the hinge disturbs the original gum when removed.

The rule is simple: mint Never Hinged stamps belong in stamp mounts. Used stamps (which have no gum to protect) can be hinged perfectly acceptably.

A mount is a small sleeve of clear acetate sealed at the bottom, with a black or clear backing strip that is gummed on the reverse. The stamp slides in and is held without anything touching its face or gum. Mounts are more expensive than hinges but are essential for any mint stamp of significant value.

Glassine Envelopes

For bulk or loose stamps awaiting sorting, glassine envelopes are ideal. Glassine is a smooth, semi-transparent paper that is naturally acid-free and resists moisture. Sort stamps into glassines by country or period, label each one, and store them in a box or drawer. Never use ordinary paper envelopes — these are acidic.

The Ideal Storage Environment

• Temperature: 15–18°C (59–64°F). A cool interior room is better than an attic (too hot in summer, damp in winter) or basement (prone to flooding and humidity).
• Relative humidity: 45–55%.
• Light: darkness, or at minimum no direct light. Keep albums in boxes or on closed shelves.
• Air quality: away from cooking fumes, cigarette smoke, and cleaning chemicals.

A hygrometer (under £10) lets you monitor the humidity in your storage area. Silica gel sachets in enclosed storage spaces help regulate humidity — replace or recharge them when they become saturated.

What Not to Do

• Rubber bands. These bite into perforation teeth and leave chemical marks on paper.
• PVC plastic sleeves or folders. PVC off-gasses plasticisers over time, causing stamps to stick and colours to migrate. Use only archival polyester (Mylar) or polypropylene.
• Direct sunlight. Even brief, repeated exposure fades colours irreversibly.
• Cardboard boxes. Standard cardboard is acidic. Use acid-free boxes or album covers.
• Stacking albums flat under weight. This can crush delicate perforations on thicker mounts.

Next Steps

Good storage keeps your collection safe — but knowing your tools makes collecting more productive and enjoyable. Read Essential Stamp Collecting Tools and Supplies for honest advice on exactly what to buy, from tongs to UV lamps, and what you can leave until later.