Carbonless copy paper, NCR (no carbon required) has largely displaced traditional black one-time carbon paper. Its uses include multipart business forms, continuous stationery, and credit card slips. The converted products are made up of 3 types of carbonless paper.
Coated back paper (CB)
The paper is surface sized. Then the back side is coated off-machine (by air knife or roll coater) with microcapsules. They contain an oil, in which is dissolved a color-forming dye. The microcapsules themselves are gelatin(e) or synthetic. High quality CB paper is also lightly pigment coated on the top side to improve brightness and printability.
Coated front and back paper (CFB)
The back side is surface sized, and the top side is coated with reactive pigment. Then the back side is coated off-machine with the CB microcapsule coating.
Coated front paper (CF)
The back side is surface sized, and the top side is coated with developer.