copying ink

Then letters were written with special copying ink which was not blotted.

It could make a dozen copies if the letter was written with a pen and good copying ink.

Some documents that were to be copied with copying presses were written with copying pencils rather than copying ink.

Prior to the introduction of inks made with aniline dyes in 1856, the quality of copies made on letter copying presses was limited by the properties of the available copying inks.