I don't know what year schools stopped using ditto machines to make copies, but it sounded a death knell to a process that was both tactile and sensory. The Ditto Machine was originally called the "Spirit Duplicator" which was so named because of the alcohol solvents used to ink the pages.
Was it harmful to inhale? Um. yeah.
This smell was so strong that fresh ditto copies prompted students to smell them. In fact, many of us loved to smell the alcohol solvents still permeating the paper. It's why I described the ditto copy as a sensory experience.
This is what tests were printed on. It was the way you received homework assignments. It's how announcements, newsletters and permission slips were printed.
I'm not sure what me me think of the lost ditto paper of my youth, but it was probably that strong chemical smell still bouncing around in my brain.
The inkjet and laser printer have long since taken over and the extinction of the ditto machine is just another reminder of time's continuous march into the future.