Don't put too much spit on the hinge. Never move a hinged stamp until it has completely dried. You may wish to dedicate your collection to either hinges or plastic mounts, and if you collect gummed stamps, make it the latter. Your dealer will stock appropriate mounting materials. Soaking Stamps You can get used stamps off of envelopes by soaking them in cold water.
Some catalogs note stamps with fugitive ink.
In these cases, leave the stamp on the envelope. The APS is an internationally recognized group of philatelists. All rights reserved.