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Carbonless Paper is coated with two different types of chemicals: CF or also called Coated Front, and CB or Coated Back. These chemicals are held in tiny capsules and are released when the capsules are burst by pressure from a pen or printer. When the CF and CB chemicals interact, the CF chemicals darken causing an image to appear on the CF side of the sheet. One obvious way to tell that the CF and CB chemicals are different is that the image appears only on the front sheet, so there is no image on the back of any sheets.