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A copy made with carbon paper. Before the development of photographic copiers, a carbon copy was the under-copy of a typed or written document placed over carbon paper and the under-copy sheet itself (not to be confused with the carbon print family of photographic reproduction processes). [1]
Carbonless copy paper; Photographic processes: Reflex copying process (also reflectography, reflexion copying) Breyertype, Playertype, Manul Process, Typon Process, Dexigraph, Linagraph; Daguerreotype; Salt print; Calotype (the first photo process to use a negative, from which multiple prints could be made) Cyanotype; Photostat machine; Rectigraph
The process was called mimeography, and a copy made by the process was a mimeograph. Mimeographs, along with spirit duplicators and hectographs , were common technologies for printing small quantities of a document, as in office work, classroom materials, and church bulletins.
Using letter copying presses, copies could be made up to twenty-four hours after a letter was written, though copies made within a few hours were best. A copying clerk would begin by counting the number of master letters to be written during the next few hours and by preparing the copying book. Suppose the clerk wanted to copy 20 one-page letters.
There have been some experimental uses of carbon paper in art: as a surface for painting and mail art (to decorate envelopes). Carbon paper is commonly used to transfer patterns onto glass in the creation of stained glass. [7] Carbon paper disks are still used in school physics labs as part of experiments on projectile motion and position. [8]
It was usually used with carbon paper for typing duplicates in a typewriter, for permanent records where low bulk was important, or for airmail correspondence. [3] It is typically 25–39 g/m 2 (9-pound basis weight in US units), and may be white or canary-colored.
This has to do with the negatives (separations) being right- or wrong-reading and the image "flopping" during the transfer process. Because the carbon printing process uses pigments instead of dyes, it is capable of producing a far more archivally stable (permanent) print than any of the other color processes. Good examples of the color ...
Chromosome conformation capture carbon copy (5C) detects interactions between all restriction fragments within a given region, with this region's size typically no greater than a megabase. [2] [20] This is done by ligating universal primers to all fragments. However, 5C has relatively low coverage.
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