carbon process

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A photographic printing process using permanent pigments, such as carbon, contained in a sensitized tissue or film of gelatin.

from the GNU version of the Collaborative International Dictionary of English.

• (Photog.) A printing process depending on the effect of light on bichromatized gelatin. Paper coated with a mixture of the gelatin and a pigment is called carbon paper or carbon tissue. This is exposed under a negative and the film is transferred from the paper to some other support and developed by washing (the unexposed portions being dissolved away). If the process stops here it is called single transfer; if the image is afterward transferred in order to give an unreversed print, the method is called double transfer.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun the process of making carbon prints

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a process of printing on paper coated with bichromated gelatin containing pigment