From the Telegraph (UK).
Teachers told they must not use red ink for marking homework in case it upsets pupils
22 April 2013
Teachers at a secondary school in London have been told they must not use red ink when marking homework in case it upsets pupils.
The move was condemned as "political correctness gone wild" and ministers were forced to deny the Government issues guidelines on the colour of teachers' pens.
Tory MP Bob Blackman took his concerns to parliament after a teacher in his Harrow East constituency informed him the secondary school had banned staff from using red ink.
He told MailOnline: "A teacher contacted me and said I cannot believe I have been instructed by my head to mark children’s homework in particular colours and not to use certain colours.
"It is all about not wanting to discourage youngsters if their work is marked wrong.
"It sounds to me like some petty edict which is nonsense. It is absolutely political correctness gone wild.