You could also get that effect if you were to print it out on NCR paper, crumple it up, flatten it out and copy it a few times. You would also have to lighten the contrast in order to get out a lot of the wrinkles in subsequent copies.
Yeah, but these dots around it are all the same size more or less. I tried it last night on a piece of paper and it looks exactly the same. Take a white piece of paper and a black ballpont pen, and really fast just dot the page all over at random. It looked exactly the same, same light to dark dots from hitting the paper at different pressures etc. I have a fax machine also and I got nowhere near that many dots after making copies after copies on a letter I had. To me they look too similar in size for it to be just from carbonized paper.