Blued Paper
See Bleuté.
Automatic Perforation
Stamps supplied in rolls for use in vending machines were, in early examples, imperforate, or perforate in one direction only,
Acid-free Paper
Paper manufactured under neutral conditions with a pH greater than 7.0, containing no acidic additives.
Aero-Philately
A branch of philately concerned with the study and/or collection of air-stamps.
Bank Mail
Stamp assortment, usually on paper, collected from the incoming mail of financial institutions.
C.P., Copper-plate
The initials denoting stamps printed by the copper-plate method, although not necessarily from plates of copper. See Line-engraving.
Acacia Gum
A water-soluble gum obtained from several species of the Acacia (Acacia Senegal and Acacia arabica, used in the manufacture of
ATM
Automatic Teller Machine. In reference to stamp collecting, an ATM, which also dispenses stamps.
Holed
Holes punched out of stamps generally indicate a form of cancellation. Spanish stamps with circular disk punched out have been
Expert, Expertised
In cases of doubt as to genuineness, stamps can be submitted to an expert, or, better, to a committee of
Embossed Printing
Printing in high relief, with or without colour.
Dominical Labels
The small detachable labels below the Belgian stamps of 1893-1914, which bear the instruction in French and Flemish not to
Die
The original plate or block bearing the design engraved in correct dimension is the original or master die. It is
Cover
The envelope or wrapper. A stamp retained on the whole envelope is “on original cover,” or “on entire.” If only
Drop Letter (U.S.)
A letter to be delivered from the office where posted.