Carbon paper is also ⎽⎽⎽⎽⎽⎽⎽⎽ in fuel cell applications.
manufacture The manufacture of carbon paper was formerly the largest consumer of montan wax.
remained It was then possible to use polyester or other plastic film as a substrate, instead of paper, although the name remained carbon paper.
used Good answer!
Carbon paper (originally carbonic paper) was originally paper coated on one side with a layer of a loosely bound dry ink or pigmented coating, bound with wax, used for making one or more copies simultaneously with the creation of an original document when using a typewriter or a ballpoint pen.