Copying paper

from The Collaborative International Dictionary of English v.0.48

Copying \Cop"y*ing\, a. & n.
   From {Copy}, v.
   [1913 Webster]

   {Copying ink}. See under {Ink}.

   {Copying paper}, thin unsized paper used for taking copies of
      letters, etc., in a copying press.

   {Copying press}, a machine for taking by pressure, an exact
      copy of letters, etc., written in copying ink.
      [1913 Webster]