If your NCR job has Terms & Conditions or anything else printed on the reverse of the sheet, we advise that you set the text or any images to a 70% tint of black ink.

C (Cyan): 0% | M (Magenta): 0% | Y (Yellow): 0% | K (Black): 70%

This will reduce the black ink to a lighter grey colour and will help eliminate what has been printed being visible from the front of the NCR sheet.