Several copies can be made by pressing a chemical undercoating on the top sheet into a claylike coating on the top of the second sheet. The writing (or printing) pressure forms an image by the coating material. The same process applies to the back of the second sheet for producing a carbon copy on the face of the succeeding sheet, and so on.
NCR paper has many applications in sales books, checkbooks, inventory tickets, and deposit slips. It offers cleaner, clearer, and longer-lasting copies than carbon-interleaved forms. No carbon means no smears or smudges.
One problem is the sensitivity of the chemical: It shows every unintended scratch. Other disadvantages are difficulty with erasures and high cost. NCR paper costs as much as 25 percent more than the carbon-interleaved form considering the labor savings of the NCR process, however, cost may be well justified in the long run.
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