Why do teachers use a red pen to correct students' work?

[Birjis]

As a teacher why should I use a red pen to write.
The colour RED denotes danger and anger so why do teachers use red to correct students’ work?

[donald1]

i don't know very well but is of different colour so that correction can be seen easily.



regards,
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[donald1]

hello brjis where are u come n judge my answer.