1.Lightweight tissue paper that has been coated with a carbon ink that will transfer an image to another sheet when pressure is applied
2.This consists of two sheets of paper, the underside of the top sheets (called CB for coated back) is coated with colourless dye in minute gelatine capsules. The underneath sheet (CF coated front) is coated with a reactive chemical which turns blue or black when mixed with the colourless dye. Pressure from a pen or typewriter on the top sheet causes the gelatine capsules to break, the dye and chemical then mix and the blue or black copy appears on the bottom sheet. There is also an intermediate paper (CFB coated front and back), used between the top and bottom sheets to make multi-part sets. Some types of carbonless paper are not separately coated but incorporate both parts of the dye mechanism within the one sheet.