How do I remove a self-adhesive stamp from an envelope or backing paper?
Self-adhesive stamps issued prior to 2008 should be soaked in room-temperature water for 20-25 minutes. Then gently slide the stamp off the backing paper.
*Stamps issued from 2008 onward should NOT be soaked. The stamp will likely never come off and you may damage it in the process. Instead, simply cut around the stamp to remove it from the envelope, taking care not to cut into the stamp while trimming.