carbonless copy paper
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Related to carbonless copy paper: NCR paper
carbonless copy paper[′kär·bən·ləs ′käp·ē ‚pā·pər]
A sheet of paper, used to make duplicate copies of written or printed material, whose back is coated with a layer of microcapsules that contain a dye in colorless form in a hydrocarbon solvent; writing or printing pressure breaks the capsules and releases the dye, which reacts with a clay or phenolic resin coating on top of a second paper sheet, located directly below the first, to produce visible color.