The Hidden Danger of Envelope Dye
Soaking used postage stamps off paper is a classic philatelic practice, but it carries a hidden risk: color bleeding. When paper envelopes are submerged in water, the dyes used to color the paper can dissolve and bleed into the water. This loose dye can permanently stain your stamps, ruining their visual appeal and historical integrity.
To preserve your collection, you must learn how to identify high-risk materials and isolate them before they touch a single drop of water. Taking a methodical approach to sorting your paper clippings is the best way to prevent accidental dye transfer.
Identifying and Separating High-Risk Envelopes
Before you begin any soaking session, you must sort your paper clippings carefully. Look closely at the envelopes. You should immediately pull out any brightly colored envelopes, such as red or green covers, and lay them aside to soak separately.
Because these bright dyes are highly prone to bleeding, soaking them in the same water as stamps on white paper can cause catastrophic color transfer. Keeping them isolated is the first and most critical step in safe stamp preservation.
Preparing the Stamps for Isolation Soaking
Once you have separated your brightly colored clippings from the white ones, prepare them for their individual baths. Carefully cut off the upper right-hand corner of the envelopes, taking great care not to cut into the stamps themselves.
Prepare a shallow bowl with a few inches of lukewarm water. It is vital to ensure the water is not hot, as hot water can damage the delicate paper fibers and stamp inks. Place the clipped paper stamp-side up in the water, ensuring they have plenty of room to float freely.
Managing the Soaking Bath Safely
Do not crowd the soaking bowl. If you are processing a large batch of stamps, even isolated ones, make sure to change your water after every two or three batches to keep it clean and free of dissolved gum or residual dyes.
After a few minutes in the lukewarm water, you will notice the stamps begin to float free from the envelope paper. Be patient during this process; never try to pull or peel a stamp free from the paper before it is completely ready, as doing so can easily tear the wet paper.
Safe Handling and Drying of Wet Stamps
Handling wet stamps requires extreme caution. While stamp tongs are the industry standard for handling dry stamps to protect them from skin oils, you should avoid using tongs on wet stamps. Wet paper is incredibly fragile and highly susceptible to tearing or puncturing under the pressure of metal or plastic tips.
Instead, let the stamps float completely free, rinse the back of each stamp gently in fresh water to remove any remaining gum, and carefully transfer them to dry. Place the wet stamps face down between two clean paper towels, and place a heavy book on top to prevent curling as they dry overnight.
Special Considerations for Modern Self-Adhesives
As you sort your stamps, keep in mind that modern issues require different preservation techniques. While older stamps and most U.S. self-adhesives issued before 2007 can be removed by soaking in water, most U.S. self-adhesives issued in 2004 or later will not soak off easily in water because their backing is oil-based rather than water-based.
Attempting to soak these modern self-adhesives in water will not release them and may expose them to unnecessary moisture. For these post-2004 issues, an organic oil solvent is required to safely release the stamp from the envelope paper.
Post-Drying Identification and Storage
Once your stamps are completely dry, they are safe to handle with standard stamp tongs. You can now use the StampSnap app to scan your dry stamps, helping you establish a likely identification and create a digital record of your newly preserved items.
For physical storage, place your dry stamps in protective glassine envelopes until you are ready to mount them. When you are ready to display them, use peelable hinges or clear plastic mounts in an archival album or stockbook. Never use household tape or glue, which will permanently damage the paper and decrease the stamp's value.
Frequently asked questions
Can I soak red or green envelopes with white envelopes?
No. Brightly colored envelopes, such as red or green covers, should always be set aside and soaked separately. The dyes from these envelopes can easily bleed into the water and permanently stain your stamps.
Is it safe to use stamp tongs on wet stamps?
No, it is not recommended. Wet stamps are highly fragile and easily damaged. To prevent tears, avoid using tongs on wet stamps and instead let them dry completely on paper towels before handling them with tongs.
Why won't my modern U.S. self-adhesive stamps soak off in water?
Most U.S. self-adhesive stamps issued in 2004 or later use an oil-based backing instead of a water-based one. Because of this, they will not soak off in water and require a specialized oil solvent to safely separate them from the paper.
What should I do if a stamp does not slide off the paper easily during soaking?
Be patient and do not force or pull the stamp. Forcing a stamp before the adhesive has fully dissolved can cause the paper to tear. Allow it to float until it slides off naturally, or change the water if the gum is stubborn.