https://archive.org/details/super-secretary/mode/2up

Benefits of wax carbon paper over film-based carbon paper:<br /> - darker printing<br /> - better shelf-life

Benefits of film-based carbon paper over wax carbon paper:<br /> - crumple resistant<br /> - smudge resistant<br /> - sharper text over generations

https://www.youtube.com/watch?v=1vy2ht2t4pI