Re: Ghost in the machine
In the middle 1960's we had a GE card reader that refused to read green cards. We warned people about this but they wouldn't listen. The cards would feed 9-edge first and make a right angled turn and then eject through a photo reader 1st column first. This reader would sometimes tear the webbing between the 7 row near column 56 (or something like that).
It was always fun to tell people that the reader wouldn't read green cards when they came in with their multi-colored card decks. They would look at us like we were crazy but when the reader would get to the green cards in their deck it would jam. After flattening out the damaged card and rereading it the card reader would jam on the next green card.
Apparently the green ink made the cards less rigid than the other colors.