Doctor blade flaw - in modern high-speed printing machines surplus ink is removed from the printing surface by a flexible steel blade, known as the doctor blade. This process can cause characteristic flaws on the printed stamps.
Doctor Blade A flexible steel blade which is used to removes surplus ink from the printing cylinder on high-speed modern presses. Faulty operation can cause flaws of a non-constant nature on the printed stamps.
Doctor Blade - A metal blade used to clean surplus ink from the cylinder or plate.
Documentary Stamps - Non-postage stamps used to certify that fees have been paid on a variety of legal documents such as contracts.
s Doctor Blade - A rubber device used to wipe excess ink from the printing plate. Any flaw in the 'Doctor Blade' can result in an ink line on the finished stamp called a 'Doctor Blade Line'.
It is an example of a doctor blade flaw, created when the blade that wipes the excess ink from the printing cylinder develops a nick. This nick leaves a line running the length of the stamp. The line can be seen just to the right of the queen's head.
Doctor blade - A steel blade which wipes ink from the cylinder.
Dot, no dot - See Cylinder.
Double date stamp - See Duplex.
Double-ring c.d.s. - A circular date handstamp contained within two concentric circles.
Doctor blade: device used to wipe excess ink from a printing press cylinder.
Documentary stamps: U.S. Inter. Rev. inscription; revenue stamps that are applied to documents such as bills of lading, mortgages, wills, etc., 1871-1958.
 See also: Machin, Used, Printing, Stamp, Definitive
  
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