The Collector's Dilemma: On Cover vs. Off Cover
When you acquire new stamps on mailed envelopes, you face an immediate preservation decision: should you keep the stamp on its original paper, or soak it off to mount in an album? Answering this question immediately helps protect the historical integrity of your collection. Before making any physical changes, you can use StampSnap to help create a likely identification of the stamp and document its current state.
Preserving a stamp on its original envelope (or "cover") protects the postal history, while safely soaking a stamp allows you to display it cleanly in a traditional album or stock book. Understanding when to preserve the entire envelope and when to proceed with soaking is a fundamental skill for every philatelist.
When to Keep a Stamp on Its Original Envelope
Not every stamp should be removed from its paper. If the envelope features a special cancellation mark, a unique postal routing mark, or an appealing design that complements the stamp, you should keep the entire envelope intact. In these cases, the best preservation strategy is to place the complete envelope directly into your album.
Preserving the entire cover keeps the historical context of the mailing intact. This is especially important for older or rarer issues where the postmark itself holds significant interest, or where the combination of the envelope and the stamp tells a complete historical story.
Identifying Candidates for Soaking
If the envelope is modern, damaged, or lacks any interesting postal markings, soaking the stamp off the paper is a standard way to prepare it for your album. However, you must evaluate the stamp's paper and adhesive type first. Classic stamps and many older issues are excellent candidates for water-based soaking.
Before you begin the soaking process, sort your stamps and set aside any brightly colored envelopes, such as red or green covers. These must be soaked separately because their dyes can bleed into the water and permanently stain your stamps.
Preparing the Soaking Environment Safely
To begin the soaking process, carefully cut the corners of the envelopes around the stamps, taking great care not to cut the stamp paper or perforations. Fill a shallow bowl with a few inches of lukewarm water. It is critical to ensure the water is not hot, as hot water can easily damage the stamp paper and inks.
Place the cut paper pieces stamp side up in the water. Do not overcrowd the bowl; the stamps must have enough room to float freely as the water dissolves the adhesive. If you are processing a large volume of stamps, be sure to change the water after every two or three batches to keep it clean.
The Safe Soaking and Drying Workflow
After a few minutes in the lukewarm water, the stamps will begin to float free from the envelope paper. Patience is essential during this stage; never attempt to pull or peel a stamp from the paper before it is completely ready, as you risk tearing the fragile paper fibers. Once the stamp separates naturally, gently rinse the back in fresh water to remove any remaining gum.
While some general guides suggest using tongs on wet stamps, we strongly advise against using metal or plastic tongs on wet paper, as wet stamps are highly vulnerable to tearing and physical damage. Instead, carefully slide the wet stamp onto a clean surface to dry. Place the stamps face down between two dry paper towels and place a heavy book on top to prevent curling as they dry overnight.
Handling the Modern Self-Adhesive Exception
It is important to note that modern stamps require a different preservation workflow. Most United States self-adhesive stamps issued in 2004 or later—and almost all issued since 2007—will not soak off in water. The United States Postal Service changed its printing specifications during this period, transitioning to an oil-based adhesive backing rather than a traditional water-soluble gum.
Soaking these modern issues in water will not release them and may damage the paper. Instead, these stamps require a specialized oil solvent to safely release the oil-based backing from the envelope paper. Always identify the era of your stamp before introducing it to water.
Storing and Organizing Your Preserved Stamps
Once your soaked stamps are completely dry, you can safely handle them using stamp tongs. Tongs feature a smooth gripping surface designed specifically to prevent skin oils from transferring to the dry paper. Store your dry stamps in glassine envelopes until you are ready to organize them.
When you are ready to mount them, use peelable hinges or clear plastic mounts in an acid-free album or a stock book with paper or plastic pockets. Never use household tape or glue, as these adhesives will permanently damage the paper and drastically decrease the stamp's value. You can then use StampSnap to log your newly mounted stamps and keep an organized digital record of your growing collection.
Frequently asked questions
Can I soak modern US self-adhesive stamps in water?
No, most United States self-adhesive stamps issued in 2004 or later (and almost all since 2007) feature an oil-based backing instead of water-soluble gum. They will not soak off in water and require an oil solvent to separate safely.
Why should I avoid using household tape or glue in my stamp album?
You should never use tape or glue because they will permanently damage the stamp paper and decrease the stamp's value. Instead, use peelable hinges or clear plastic mounts to safely attach stamps to acid-free album pages.
How do I prevent stamps from curling after they have been soaked?
After rinsing the back of the stamp to remove the gum, place the wet stamps face down between two paper towels. Place a heavy book on top of them and leave them to dry overnight to keep them flat.