Rust: A brown mold resembling the rust in iron. Rust affects stamp paper and gum in tropical regions.
Rust: A brown mold on stamps.
S
SASE: A self-addressed, stamped envelope.
Die rust
Pitting or roughness appearing on a coin as a result of that coin having been struck by a rusted die.
Die state ...
In stamp collecting these spots are called rust. If you have any stamps with rust on them, you can use some special chemicals to clean them up.
Foxing is a term describing the age-related spots and browning seen on vintage paper documents such as books, postage stamps, certificates, and so forth. The name may derive from the fox-like reddish-brown color of the stains, or the rust ...
 See also: Stamp, Trans, Type, Used, Repair
  
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