Surface-colored paper

Surface-Colored Paper:
Sweatbox:
A closed box containing a wet sponge-like material, over which stuck-together unused stamps are placed on a grill. Humidity softens the gum, allowing separation of stamps.

paper (French wartime economy paper), goldbeater's skin, granite paper, hard paper, India proof paper, Japanese paper, manila paper, native paper, pelure paper, rep paper, rice paper, ribbed paper, semipelure paper, soft paper, surface-colored paper, ...

See also: Roll, Granite, Proof, Local, Imprint