Wiktionary
carbonless
a. Without carbon.
Usage examples of "carbonless".
It was a carbonless system with a permanent record in yellow overlaid by white perforated originals.
There was nothing in it except the stink of upholstery cleaner and carbonless copies of the rental agreement.
A similar process is used to make carbonless copy paper, only the bubbles are filled with a special chemical instead of a fragrance.