Schoolteachers have used the dreaded ren pen to mark up their students' mistakes for generations.
The sight of red ink became so jarring that several schools in England banned teachers from using it in the 2000s. Many of them hoped that by forcing teachers to make their corrections in other colors, it would soften the stigma of making a mistake.
He continued: "Red pen can be quite de-motivating for children," Richard Sammonds, the head teacher at Kent Junior School in England, told The Telegraph in 2008. "It has negative, old school connotations of 'See me' and 'Not good enough.'"
"We are no longer producing clerks and bookkeepers. We are trying to provide an education for children coming into the workforce in the 21st century."